ELB_UMN_0408_VERSION

Reviewed-by: Hajba, László Antal <laszlo-antal.hajba@t-systems.com>
Co-authored-by: zhoumeng35 <zhoumeng35@huawei.com>
Co-committed-by: zhoumeng35 <zhoumeng35@huawei.com>
This commit is contained in:
2025-04-15 18:17:32 +00:00
committed by zuul
parent 5d7ef90c79
commit e856aa7145
45 changed files with 432 additions and 422 deletions

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@ -2973,7 +2973,7 @@
"node_id":"elb_faq_210202201.xml",
"product_code":"elb",
"code":"145",
"des":"You cannot change the VPC and subnet for your Shared load balancers.You can change the subnet but not the VPC for your dedicated load balancers.",
"des":"You cannot change the VPC and subnet for your shared load balancers.You can change the subnet but not the VPC for your dedicated load balancers.",
"doc_type":"usermanual",
"kw":"Can I Change the VPC and Subnet for My Load Balancer?,ELB Functionality,User Guide",
"search_title":"",
@ -3141,7 +3141,7 @@
"node_id":"elb_faq_0065.xml",
"product_code":"elb",
"code":"153",
"des":"Quotas can limit the number or amount of resources available to users, such as the maximum number of ECSs or EVS disks that can be created.If the existing resource quota ",
"des":"Quotas can limit the number of resources available to users, such as the maximum number of ECSs or EVS disks that can be created.If the existing resource quota cannot mee",
"doc_type":"usermanual",
"kw":"What Is Quota?,Load Balancers,User Guide",
"search_title":"",

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@ -1296,7 +1296,7 @@
"code":"144"
},
{
"desc":"You cannot change the VPC and subnet for your Shared load balancers.You can change the subnet but not the VPC for your dedicated load balancers.",
"desc":"You cannot change the VPC and subnet for your shared load balancers.You can change the subnet but not the VPC for your dedicated load balancers.",
"product_code":"elb",
"title":"Can I Change the VPC and Subnet for My Load Balancer?",
"uri":"elb_faq_210202201.html",
@ -1368,7 +1368,7 @@
"code":"152"
},
{
"desc":"Quotas can limit the number or amount of resources available to users, such as the maximum number of ECSs or EVS disks that can be created.If the existing resource quota ",
"desc":"Quotas can limit the number of resources available to users, such as the maximum number of ECSs or EVS disks that can be created.If the existing resource quota cannot mee",
"product_code":"elb",
"title":"What Is Quota?",
"uri":"elb_faq_0065.html",

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@ -10,27 +10,27 @@
</th>
<th align="left" class="cellrowborder" valign="top" width="22.38%" id="mcps1.3.1.4.2.5.1.3"><p id="elb_billing_0003__en-us_topic_0000001819164006_p136191843179">Billing Mode</p>
</th>
<th align="left" class="cellrowborder" valign="top" width="25%" id="mcps1.3.1.4.2.5.1.4"><p id="elb_billing_0003__en-us_topic_0000001819164006_p8385141720718">Formula</p>
<th align="left" class="cellrowborder" valign="top" width="25%" id="mcps1.3.1.4.2.5.1.4"><p id="elb_billing_0003__en-us_topic_0000001819164006_p8385141720718">Billing Formula</p>
</th>
</tr>
</thead>
<tbody><tr id="elb_billing_0003__en-us_topic_0000001819164006_row1338517171579"><td class="cellrowborder" valign="top" width="16.53%" headers="mcps1.3.1.4.2.5.1.1 "><p id="elb_billing_0003__en-us_topic_0000001819164006_p8385417275">LCU</p>
</td>
<td class="cellrowborder" valign="top" width="36.09%" headers="mcps1.3.1.4.2.5.1.2 "><p id="elb_billing_0003__en-us_topic_0000001819164006_p1278431011816">You are charged based on <strong id="elb_billing_0003__en-us_topic_0000001819164006_b85788667131">the number of LCUs used by a load balancer per hour</strong>.</p>
<td class="cellrowborder" valign="top" width="36.09%" headers="mcps1.3.1.4.2.5.1.2 "><p id="elb_billing_0003__en-us_topic_0000001819164006_p1278431011816">You are charged based on <strong id="elb_billing_0003__b22921836162515">the number of LCUs used by a load balancer</strong>.</p>
<p id="elb_billing_0003__en-us_topic_0000001819164006_p9629441173810">An LCU measures the dimensions on which a dedicated load balancer routes the traffic. See LCU prices in LCU Pricing.</p>
</td>
<td class="cellrowborder" valign="top" width="22.38%" headers="mcps1.3.1.4.2.5.1.3 "><p id="elb_billing_0003__en-us_topic_0000001819164006_p134141445851">Pay-per-use</p>
</td>
<td class="cellrowborder" valign="top" width="25%" headers="mcps1.3.1.4.2.5.1.4 "><p id="elb_billing_0003__en-us_topic_0000001819164006_p931714291570"><strong id="elb_billing_0003__en-us_topic_0000001819164006_b10762223105912">Unit price</strong> x <strong id="elb_billing_0003__en-us_topic_0000001819164006_b5719730175914">Number of LCUs</strong> x <strong id="elb_billing_0003__en-us_topic_0000001819164006_b1960703385916">Required duration</strong></p>
<td class="cellrowborder" valign="top" width="25%" headers="mcps1.3.1.4.2.5.1.4 "><p id="elb_billing_0003__en-us_topic_0000001819164006_p931714291570"><strong id="elb_billing_0003__b39823492917">Unit price</strong> × <strong id="elb_billing_0003__b17981634192912">Number of LCUs</strong></p>
</td>
</tr>
<tr id="elb_billing_0003__en-us_topic_0000001819164006_row143857178720"><td class="cellrowborder" valign="top" width="16.53%" headers="mcps1.3.1.4.2.5.1.1 "><p id="elb_billing_0003__en-us_topic_0000001819164006_p9332124912814">Load Balancer</p>
<tr id="elb_billing_0003__en-us_topic_0000001819164006_row143857178720"><td class="cellrowborder" valign="top" width="16.53%" headers="mcps1.3.1.4.2.5.1.1 "><p id="elb_billing_0003__en-us_topic_0000001819164006_p9332124912814">Load balancer</p>
</td>
<td class="cellrowborder" valign="top" width="36.09%" headers="mcps1.3.1.4.2.5.1.2 "><p id="elb_billing_0003__en-us_topic_0000001819164006_p1361645411812">You are charged for <strong id="elb_billing_0003__en-us_topic_0000001819164006_b16660180797131">how long a dedicated load balancer is retained in your account</strong>. If the load balancer is retained in your account for less than 1 hour, you will be charged for the actual duration, accurate to seconds.</p>
<td class="cellrowborder" valign="top" width="36.09%" headers="mcps1.3.1.4.2.5.1.2 "><p id="elb_billing_0003__en-us_topic_0000001819164006_p1361645411812">You are charged for <strong id="elb_billing_0003__b57533421298">how long a dedicated load balancer is retained in your account</strong>. If the load balancer is retained in your account for less than 1 hour, you will be charged for the actual duration, accurate to seconds.</p>
</td>
<td class="cellrowborder" valign="top" width="22.38%" headers="mcps1.3.1.4.2.5.1.3 "><p id="elb_billing_0003__en-us_topic_0000001819164006_p698514212513">Pay-per-use</p>
</td>
<td class="cellrowborder" valign="top" width="25%" headers="mcps1.3.1.4.2.5.1.4 "><p id="elb_billing_0003__en-us_topic_0000001819164006_p53850171873"><strong id="elb_billing_0003__en-us_topic_0000001819164006_b281506737131">Unit price x Required duration</strong></p>
<td class="cellrowborder" valign="top" width="25%" headers="mcps1.3.1.4.2.5.1.4 "><p id="elb_billing_0003__en-us_topic_0000001819164006_p53850171873"><strong id="elb_billing_0003__b64696820300">Unit price × Required duration</strong></p>
</td>
</tr>
</tbody>
@ -38,7 +38,7 @@
</div>
<p id="elb_billing_0003__en-us_topic_0000001819164006_p732116983916">The billing items of dedicated load balancers vary by specification type. For details, see <a href="#elb_billing_0003__en-us_topic_0000001819164006_table2032117912396">Table 2</a>.</p>
<div class="tablenoborder"><a name="elb_billing_0003__en-us_topic_0000001819164006_table2032117912396"></a><a name="en-us_topic_0000001819164006_table2032117912396"></a><table cellpadding="4" cellspacing="0" summary="" id="elb_billing_0003__en-us_topic_0000001819164006_table2032117912396" frame="border" border="1" rules="all"><caption><b>Table 2 </b>Varied billing items by billing mode</caption><thead align="left"><tr id="elb_billing_0003__en-us_topic_0000001819164006_row332229143910"><th align="left" class="cellrowborder" valign="top" width="17.32%" id="mcps1.3.1.6.2.5.1.1"><p id="elb_billing_0003__en-us_topic_0000001819164006_p173223933914">Billing Mode</p>
<div class="tablenoborder"><a name="elb_billing_0003__en-us_topic_0000001819164006_table2032117912396"></a><a name="en-us_topic_0000001819164006_table2032117912396"></a><table cellpadding="4" cellspacing="0" summary="" id="elb_billing_0003__en-us_topic_0000001819164006_table2032117912396" frame="border" border="1" rules="all"><caption><b>Table 2 </b>Billing items</caption><thead align="left"><tr id="elb_billing_0003__en-us_topic_0000001819164006_row332229143910"><th align="left" class="cellrowborder" valign="top" width="17.32%" id="mcps1.3.1.6.2.5.1.1"><p id="elb_billing_0003__en-us_topic_0000001819164006_p173223933914">Billing Mode</p>
</th>
<th align="left" class="cellrowborder" valign="top" width="30.64%" id="mcps1.3.1.6.2.5.1.2"><p id="elb_billing_0003__en-us_topic_0000001819164006_p832239193918">Specifications</p>
</th>
@ -72,7 +72,7 @@
</div></div>
</div>
<div class="section" id="elb_billing_0003__en-us_topic_0000001819164006_en-us_topic_0000001504522410_section1384816209374"><h4 class="sectiontitle">LCU Pricing</h4><p id="elb_billing_0003__en-us_topic_0000001819164006_en-us_topic_0000001504522410_p719353817218">An LCU measures the dimensions on which a dedicated load balancer routes the traffic. See LCU price in <a href="#elb_billing_0003__en-us_topic_0000001819164006_en-us_topic_0000001504522410_table54298422029">Table 3</a>.</p>
<p id="elb_billing_0003__en-us_topic_0000001819164006_p050213444341">The unit price of LCU varies depending on the billing mode and specifications. See the actual price of LCU on the console. <strong id="elb_billing_0003__b1597019231329">LCU price = Unit price x Number of LCUs x Required duration</strong>.</p>
<p id="elb_billing_0003__en-us_topic_0000001819164006_p050213444341">The unit price of LCU varies depending on the specifications. See the actual price of LCU on the console. <strong id="elb_billing_0003__b1597019231329">LCU price = Unit price × Number of LCUs</strong>.</p>
<div class="tablenoborder"><a name="elb_billing_0003__en-us_topic_0000001819164006_en-us_topic_0000001504522410_table54298422029"></a><a name="en-us_topic_0000001819164006_en-us_topic_0000001504522410_table54298422029"></a><table cellpadding="4" cellspacing="0" summary="" id="elb_billing_0003__en-us_topic_0000001819164006_en-us_topic_0000001504522410_table54298422029" frame="border" border="1" rules="all"><caption><b>Table 3 </b>LCU pricing</caption><thead align="left"><tr id="elb_billing_0003__en-us_topic_0000001819164006_en-us_topic_0000001504522410_row742918428211"><th align="left" class="cellrowborder" valign="top" width="18.67%" id="mcps1.3.2.4.2.5.1.1"><p id="elb_billing_0003__en-us_topic_0000001819164006_en-us_topic_0000001504522410_p742944217216">Billing Mode</p>
</th>
@ -104,11 +104,11 @@
</tbody>
</table>
</div>
<div class="note" id="elb_billing_0003__en-us_topic_0000001819164006_note73177514394"><img src="public_sys-resources/note_3.0-en-us.png"><span class="notetitle"> </span><div class="notebody"><ul id="elb_billing_0003__en-us_topic_0000001819164006_ul1262961811437"><li id="elb_billing_0003__en-us_topic_0000001819164006_li20629418104312">If you deploy a dedicated load balancer in multiple AZs, its performance will multiply as the number of AZs increases.</li><li id="elb_billing_0003__en-us_topic_0000001819164006_li12411409514">Note the following when calculating the number of LCUs:<ul id="elb_billing_0003__en-us_topic_0000001819164006_ul146677500526"><li id="elb_billing_0003__en-us_topic_0000001819164006_li14059484521">LCU quantity refers to the number of LCUs corresponding to a specification in a single AZ.</li><li id="elb_billing_0003__en-us_topic_0000001819164006_li1717915192548">If you select multiple AZs for a load balancer, the number of LCUs is calculated as follows: Number of LCUs = LCUs of the selected specification x Number of the selected AZs.</li></ul>
<div class="note" id="elb_billing_0003__en-us_topic_0000001819164006_note73177514394"><img src="public_sys-resources/note_3.0-en-us.png"><span class="notetitle"> </span><div class="notebody"><ul id="elb_billing_0003__en-us_topic_0000001819164006_ul1262961811437"><li id="elb_billing_0003__en-us_topic_0000001819164006_li20629418104312">If you deploy a dedicated load balancer in multiple AZs, its performance will multiply as the number of AZs increases.</li><li id="elb_billing_0003__en-us_topic_0000001819164006_li12411409514">Note the following when calculating the number of LCUs:<ul id="elb_billing_0003__en-us_topic_0000001819164006_ul146677500526"><li id="elb_billing_0003__en-us_topic_0000001819164006_li14059484521">LCU quantity refers to the number of LCUs corresponding to a specification in a single AZ.</li><li id="elb_billing_0003__en-us_topic_0000001819164006_li1717915192548">If you select multiple AZs for a load balancer, the number of LCUs is calculated as follows: Number of LCUs = LCUs of the selected specification × Number of the selected AZs.</li></ul>
</li></ul>
</div></div>
</div>
<div class="section" id="elb_billing_0003__en-us_topic_0000001819164006_en-us_topic_0000001504522410_section1747518211517"><h4 class="sectiontitle">LCU Billing for Elastic Specifications</h4><p id="elb_billing_0003__en-us_topic_0000001819164006_en-us_topic_0000001504522410_p996851614610">An LCU has four dimensions: <strong id="elb_billing_0003__en-us_topic_0000001819164006_b20777473857131">new connections</strong>, <strong id="elb_billing_0003__en-us_topic_0000001819164006_b5540185777131">maximum concurrent connections</strong>, <strong id="elb_billing_0003__en-us_topic_0000001819164006_b17808322127131">processed bytes</strong>, and <strong id="elb_billing_0003__en-us_topic_0000001819164006_b557704437131">rule evaluations</strong>.</p>
<div class="section" id="elb_billing_0003__en-us_topic_0000001819164006_en-us_topic_0000001504522410_section1747518211517"><h4 class="sectiontitle">LCU Billing for Elastic Specifications</h4><p id="elb_billing_0003__en-us_topic_0000001819164006_en-us_topic_0000001504522410_p996851614610">An LCU has four dimensions: <strong id="elb_billing_0003__b96731845113112">new connections</strong>, <strong id="elb_billing_0003__b06731745173110">maximum concurrent connections</strong>, <strong id="elb_billing_0003__b12673184519317">processed bytes</strong>, and <strong id="elb_billing_0003__b1267318452311">rule evaluations</strong>.</p>
<p id="elb_billing_0003__en-us_topic_0000001819164006_en-us_topic_0000001504522410_p20412846493">You can calculate the number of LCUs by taking the maximum LCUs consumed across the four dimensions.</p>
<div class="note" id="elb_billing_0003__en-us_topic_0000001819164006_note395243918242"><img src="public_sys-resources/note_3.0-en-us.png"><span class="notetitle"> </span><div class="notebody"><p id="elb_billing_0003__en-us_topic_0000001819164006_p109521339102410">The number of LCUs is rounded up to the nearest integer.</p>
</div></div>
@ -147,7 +147,7 @@
</div>
<p id="elb_billing_0003__en-us_topic_0000001819164006_en-us_topic_0000001504522410_p17814173914417"><a href="#elb_billing_0003__en-us_topic_0000001819164006_table1248129113817">Table 5</a> lists the LCU performance supported by different protocols.</p>
<div class="tablenoborder"><a name="elb_billing_0003__en-us_topic_0000001819164006_table1248129113817"></a><a name="en-us_topic_0000001819164006_table1248129113817"></a><table cellpadding="4" cellspacing="0" summary="" id="elb_billing_0003__en-us_topic_0000001819164006_table1248129113817" frame="border" border="1" rules="all"><caption><b>Table 5 </b>LCU performance supported by different protocols</caption><thead align="left"><tr id="elb_billing_0003__en-us_topic_0000001819164006_row048120910384"><th align="left" class="cellrowborder" valign="top" width="20%" id="mcps1.3.3.7.2.6.1.1"><p id="elb_billing_0003__en-us_topic_0000001819164006_p11123164711381">Protocol</p>
<div class="tablenoborder"><a name="elb_billing_0003__en-us_topic_0000001819164006_table1248129113817"></a><a name="en-us_topic_0000001819164006_table1248129113817"></a><table cellpadding="4" cellspacing="0" summary="" id="elb_billing_0003__en-us_topic_0000001819164006_table1248129113817" frame="border" border="1" rules="all"><caption><b>Table 5 </b>LCU performance supported by different protocols</caption><thead align="left"><tr id="elb_billing_0003__en-us_topic_0000001819164006_row048120910384"><th align="left" class="cellrowborder" valign="top" width="20%" id="mcps1.3.3.7.2.6.1.1"><p id="elb_billing_0003__en-us_topic_0000001819164006_p11123164711381"><strong id="elb_billing_0003__b38443366506">Protocol</strong></p>
</th>
<th align="left" class="cellrowborder" valign="top" width="20%" id="mcps1.3.3.7.2.6.1.2"><p id="elb_billing_0003__en-us_topic_0000001819164006_p1348118963818">New Connections per Second</p>
</th>
@ -167,7 +167,7 @@
</td>
<td class="cellrowborder" valign="top" width="20%" headers="mcps1.3.3.7.2.6.1.4 "><p id="elb_billing_0003__en-us_topic_0000001819164006_p104811892384">1 GB</p>
</td>
<td class="cellrowborder" valign="top" width="20%" headers="mcps1.3.3.7.2.6.1.5 "><p id="elb_billing_0003__en-us_topic_0000001819164006_p1148119923815">N/A</p>
<td class="cellrowborder" valign="top" width="20%" headers="mcps1.3.3.7.2.6.1.5 "><p id="elb_billing_0003__en-us_topic_0000001819164006_p1148119923815">-</p>
</td>
</tr>
<tr id="elb_billing_0003__en-us_topic_0000001819164006_row1248119183817"><td class="cellrowborder" valign="top" width="20%" headers="mcps1.3.3.7.2.6.1.1 "><p id="elb_billing_0003__en-us_topic_0000001819164006_p1157951314392">UDP</p>
@ -178,7 +178,7 @@
</td>
<td class="cellrowborder" valign="top" width="20%" headers="mcps1.3.3.7.2.6.1.4 "><p id="elb_billing_0003__en-us_topic_0000001819164006_p74816918385">1 GB</p>
</td>
<td class="cellrowborder" valign="top" width="20%" headers="mcps1.3.3.7.2.6.1.5 "><p id="elb_billing_0003__en-us_topic_0000001819164006_p1548110919386">N/A</p>
<td class="cellrowborder" valign="top" width="20%" headers="mcps1.3.3.7.2.6.1.5 "><p id="elb_billing_0003__en-us_topic_0000001819164006_p1548110919386">-</p>
</td>
</tr>
<tr id="elb_billing_0003__en-us_topic_0000001819164006_row848119913811"><td class="cellrowborder" valign="top" width="20%" headers="mcps1.3.3.7.2.6.1.1 "><p id="elb_billing_0003__en-us_topic_0000001819164006_p11879111753910">HTTP/HTTPS</p>

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@ -3,21 +3,21 @@
<h1 class="topictitle1">How Does ELB Perform UDP Health Checks? What Are the Precautions for UDP Health Checks?</h1>
<div id="body8662426"><div class="section" id="elb_faq_0024__section53210693319"><h4 class="sectiontitle">How UDP Health Checks Work</h4><p id="elb_faq_0024__p594001812332">UDP is a connectionless protocol. A UDP health check is implemented as follows:</p>
</div>
<ul id="elb_faq_0024__ul118961151152216"><li id="elb_faq_0024__li1896125120229">The health check node sends an ICMP request to the backend server based on the health check configuration.<ul id="elb_faq_0024__ul202464854211"><li id="elb_faq_0024__li624114811423">If the health check node receives an ICMP reply from the backend <span id="elb_faq_0024__text1730504215713">server</span>, it considers the backend server healthy and continues the health check.</li><li id="elb_faq_0024__li1644615164212">If the health check node does not receive an ICMP reply from the backend <span id="elb_faq_0024__text166053611810">server</span>, it considers the backend server unhealthy.</li></ul>
</li><li id="elb_faq_0024__li14896651122210">After receiving the ICMP reply, the health check node sends a UDP probe packet to the backend <span id="elb_faq_0024__text279319651018">server</span>.<ul id="elb_faq_0024__ul1611085454217"><li id="elb_faq_0024__li211065416424">If the health check node receives an ICMP Port Unreachable message from the backend <span id="elb_faq_0024__text73403324109">server</span> within the timeout duration, the backend server is considered unhealthy.</li><li id="elb_faq_0024__li9969105615423">If the health check node does not receive an ICMP Port Unreachable message from the backend <span id="elb_faq_0024__text02196153811">server</span> within the timeout duration, the backend server is considered healthy.</li></ul>
<ul id="elb_faq_0024__ul118961151152216"><li id="elb_faq_0024__li1896125120229">The health check node sends an ICMP request to the backend server based on the health check configuration.<ul id="elb_faq_0024__ul202464854211"><li id="elb_faq_0024__li624114811423">If the health check node receives an ICMP reply from the backend server, it considers the backend server healthy and continues the health check.</li><li id="elb_faq_0024__li1644615164212">If the health check node does not receive an ICMP reply from the backend server, it considers the backend server unhealthy.</li></ul>
</li><li id="elb_faq_0024__li14896651122210">After receiving the ICMP reply, the health check node sends a UDP probe packet to the backend server.<ul id="elb_faq_0024__ul1611085454217"><li id="elb_faq_0024__li211065416424">If the health check node receives an ICMP Port Unreachable message from the backend server within the timeout duration, the backend server is considered unhealthy.</li><li id="elb_faq_0024__li9969105615423">If the health check node does not receive an ICMP Port Unreachable message from the backend server within the timeout duration, the backend server is considered healthy.</li></ul>
</li></ul>
<p id="elb_faq_0024__p20843183062817">When you use UDP for health checks, retain default parameter settings.</p>
<div class="section" id="elb_faq_0024__section1651117513338"><h4 class="sectiontitle">Troubleshooting</h4><p id="elb_faq_0024__p1290856173312">If the backend server is unhealthy, use either of the following methods to locate the fault:</p>
</div>
<ul id="elb_faq_0024__ul3578201317447"><li id="elb_faq_0024__li257910131449">Check whether the timeout duration is too short.<p id="elb_faq_0024__p1247644393018"><a name="elb_faq_0024__li257910131449"></a><a name="li257910131449"></a>One possible cause is that the ICMP Echo Reply or ICMP Port Unreachable message returned by the backend <span id="elb_faq_0024__text11635124113813">server</span> does not reach the health check node within the timeout duration. As a result, the health check result is inaccurate.</p>
<ul id="elb_faq_0024__ul3578201317447"><li id="elb_faq_0024__li257910131449">Check whether the timeout duration is too short.<p id="elb_faq_0024__p1247644393018"><a name="elb_faq_0024__li257910131449"></a><a name="li257910131449"></a>One possible cause is that the ICMP Echo Reply or ICMP Port Unreachable message returned by the backend server does not reach the health check node within the timeout duration. As a result, the health check result is inaccurate.</p>
<p id="elb_faq_0024__p747610439305">It is recommended that you change the timeout duration to a larger value.</p>
<p id="elb_faq_0024__p18541632193414">UDP health checks are different from other health checks. If the health check timeout duration is too short, the health check result of the backend <span id="elb_faq_0024__text13586581185">server</span> frequently toggles back and forth between <strong id="elb_faq_0024__b44605421747">Healthy</strong> and <strong id="elb_faq_0024__b1292844517410">Unhealthy</strong>.</p>
</li><li id="elb_faq_0024__li1957901310440">Check whether the backend <span id="elb_faq_0024__text257519920910">server</span> restricts the rate at which ICMP messages are generated.</li></ul>
<p id="elb_faq_0024__p18541632193414">UDP health checks are different from other health checks. If the health check timeout duration is too short, the health check result of the backend server frequently toggles back and forth between <strong id="elb_faq_0024__b44605421747">Healthy</strong> and <strong id="elb_faq_0024__b1292844517410">Unhealthy</strong>.</p>
</li><li id="elb_faq_0024__li1957901310440">Check whether the backend server restricts the rate at which ICMP messages are generated.</li></ul>
<p id="elb_faq_0024__p1647644393017">For Linux servers, run the following commands to query the rate limit and rate mask:</p>
<pre class="screen" id="elb_faq_0024__screen4768112823913">sysctl -q net.ipv4.icmp_ratelimit</pre>
<p id="elb_faq_0024__p1811918431964">The default rate limit is <strong id="elb_faq_0024__b842352706193458">1000</strong>.</p>
<pre class="screen" id="elb_faq_0024__screen7265195210611">sysctl -q net.ipv4.icmp_ratemask</pre>
<p id="elb_faq_0024__p52451533713">The default rate mask is <strong id="elb_faq_0024__b1590969366">6168</strong>.</p>
<p id="elb_faq_0024__p52451533713">The default rate mask is <strong id="elb_faq_0024__b1513455003">6168</strong>.</p>
<p id="elb_faq_0024__p74763433302">If the returned value of the first command is the default value or <strong id="elb_faq_0024__b842352706103935">0</strong>, run the following command to remove the rate limit of Port Unreachable messages:</p>
<pre class="screen" id="elb_faq_0024__screen187541426251">sysctl -w net.ipv4.icmp_ratemask=6160</pre>
<p id="elb_faq_0024__p178268102918">For more information, see the <em id="elb_faq_0024__i842352697103837">Linux Programmer's Manual</em>. On the Linux CLI, run the following command to display the manual:</p>
@ -27,7 +27,7 @@
</div></div>
<div class="section" id="elb_faq_0024__section1386314212366"><h4 class="sectiontitle">Precautions</h4><p id="elb_faq_0024__p07313917363">Note the following when you configure UDP health checks:</p>
</div>
<ul id="elb_faq_0024__en-us_topic_0044589572_ul39655260125151"><li id="elb_faq_0024__en-us_topic_0044589572_li21353022125151">UDP health checks use ping packets to check the health of the backend <span id="elb_faq_0024__text4243511499722">server</span>. To ensure smooth transmission of these packets, ensure that ICMP is enabled on the backend <span id="elb_faq_0024__text9486641229734">server</span> by performing the following:<p id="elb_faq_0024__en-us_topic_0044589572_p57959472125151">Log in to the <span id="elb_faq_0024__text2377681409836">server</span> and run the following command as user <strong id="elb_faq_0024__b8423527069814">root</strong>:</p>
<ul id="elb_faq_0024__en-us_topic_0044589572_ul39655260125151"><li id="elb_faq_0024__en-us_topic_0044589572_li21353022125151">UDP health checks use ping packets to check the health of the backend server. To ensure smooth transmission of these packets, ensure that ICMP is enabled on the backend server by performing the following:<p id="elb_faq_0024__en-us_topic_0044589572_p57959472125151"><a name="elb_faq_0024__en-us_topic_0044589572_li21353022125151"></a><a name="en-us_topic_0044589572_li21353022125151"></a>Log in to the server and run the following command as user <strong id="elb_faq_0024__b8423527069814">root</strong>:</p>
<p id="elb_faq_0024__en-us_topic_0044589572_p51873203125151"><strong id="elb_faq_0024__en-us_topic_0044589572_b65813485141827">cat /proc/sys/net/ipv4/icmp_echo_ignore_all</strong></p>
<ul id="elb_faq_0024__ul5991332115413"><li id="elb_faq_0024__li5383645415427">If the returned value is <strong id="elb_faq_0024__b2702449915427">1</strong>, ICMP is disabled.</li><li id="elb_faq_0024__li234898115413">If the returned value is <strong id="elb_faq_0024__b46864838191253">0</strong>, ICMP is enabled.</li></ul>
</li><li id="elb_faq_0024__en-us_topic_0044589572_li33275046125151">The health check result may be different from the actual health of the backend server.<p id="elb_faq_0024__en-us_topic_0044589572_p31039959125151"><a name="elb_faq_0024__en-us_topic_0044589572_li33275046125151"></a><a name="en-us_topic_0044589572_li33275046125151"></a>If the backend server runs Linux, the rate of ICMP packets may be limited due to Linux's defense against ping flood attacks when there is a large number of concurrent requests. In this case, if a service exception occurs, the load balancer will not receive error message <strong id="elb_faq_0024__b84235270615853">port XX unreachable</strong> and will consider the health check to be successful. As a result, there is an inconsistency between the health check result and the actual server health.</p>

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<a name="elb_faq_0065"></a><a name="elb_faq_0065"></a>
<h1 class="topictitle1">What Is Quota?</h1>
<div id="body1549953425249"><div class="section" id="elb_faq_0065__section6321311611"><h4 class="sectiontitle">What Is Quota?</h4><p id="elb_faq_0065__en-us_topic_0040259342_p1415804616467">Quotas can limit the number or amount of resources available to users, such as the maximum number of ECSs or EVS disks that can be created.</p>
<div id="body1549953425249"><div class="section" id="elb_faq_0065__section6321311611"><h4 class="sectiontitle">Introduction</h4><p id="elb_faq_0065__en-us_topic_0040259342_p1415804616467">Quotas can limit the number of resources available to users, such as the maximum number of ECSs or EVS disks that can be created.</p>
<p id="elb_faq_0065__en-us_topic_0040259342_p547171214515">If the existing resource quota cannot meet your service requirements, you can apply for a higher quota.</p>
</div>
<div class="section" id="elb_faq_0065__section07760615438"><h4 class="sectiontitle">How Do I View My Quotas?</h4><ol id="elb_faq_0065__en-us_topic_0040259342_ol1222775692215"><li id="elb_faq_0065__en-us_topic_0040259342_li5648642910048">Log in to the management console.</li><li id="elb_faq_0065__en-us_topic_0040259342_li464234814566">Click <span><img id="elb_faq_0065__en-us_topic_0040259342_en-us_topic_0014250631_en-us_topic_0014250631_image1733511156361" src="en-us_image_0000001794820065.png"></span> in the upper left corner and select the desired region and project.</li><li id="elb_faq_0065__en-us_topic_0040259342_li3861581410048">In the upper right corner of the page, click <span><img id="elb_faq_0065__en-us_topic_0040259342_image99377514309" src="en-us_image_0000001747740124.png"></span>.<p id="elb_faq_0065__en-us_topic_0040259342_p1748884433119">The <strong id="elb_faq_0065__en-us_topic_0040259342_b695801964614">Service Quota</strong> page is displayed.</p>
<div class="section" id="elb_faq_0065__section07760615438"><h4 class="sectiontitle">How Do I View My Quotas?</h4><ol id="elb_faq_0065__en-us_topic_0040259342_ol1222775692215"><li id="elb_faq_0065__en-us_topic_0040259342_li5648642910048">Log in to the management console.</li><li id="elb_faq_0065__en-us_topic_0040259342_li464234814566">Click <span><img id="elb_faq_0065__en-us_topic_0040259342_en-us_topic_0014250631_en-us_topic_0014250631_image1733511156361" src="en-us_image_0000001794820065.png"></span> in the upper left corner and select the desired region and project.</li><li id="elb_faq_0065__en-us_topic_0040259342_li3861581410048">In the upper right corner of the page, click <span><img id="elb_faq_0065__en-us_topic_0040259342_image99377514309" src="en-us_image_0000001747740124.png"></span>.<p id="elb_faq_0065__en-us_topic_0040259342_p1748884433119">The <strong id="elb_faq_0065__b7681202616112">Service Quota</strong> page is displayed.</p>
</li><li id="elb_faq_0065__en-us_topic_0040259342_li1579070183211">View the used and total quota of each type of resources on the displayed page.<p id="elb_faq_0065__en-us_topic_0040259342_p97891720193417"><a name="elb_faq_0065__en-us_topic_0040259342_li1579070183211"></a><a name="en-us_topic_0040259342_li1579070183211"></a>If a quota cannot meet service requirements, apply for a higher quota.</p>
</li></ol>
</div>
<div class="section" id="elb_faq_0065__section457218466261"><h4 class="sectiontitle">How Do I Apply for a Higher Quota?</h4><p id="elb_faq_0065__en-us_topic_0040259342_p133802054172617">The system does not support online quota adjustment. If you need to adjust a quota, call the hotline or send an email to the customer service mailbox. Customer service personnel will timely process your request for quota adjustment and inform you of the real-time progress by making a call or sending an email.</p>
<p id="elb_faq_0065__en-us_topic_0040259342_p13745144852611">Before dialing the hotline number or sending an email, make sure that the following information has been obtained:</p>
<ul id="elb_faq_0065__en-us_topic_0040259342_ul37351029162712"><li id="elb_faq_0065__en-us_topic_0040259342_li12735132932714">Domain name, project name, and project ID, which can be obtained by performing the following operations:<p id="elb_faq_0065__en-us_topic_0040259342_p1973542918275"><a name="elb_faq_0065__en-us_topic_0040259342_li12735132932714"></a><a name="en-us_topic_0040259342_li12735132932714"></a>Log in to the management console using the cloud account, click the username in the upper right corner, select <strong id="elb_faq_0065__en-us_topic_0040259342_b171181053141511">My Credentials</strong> from the drop-down list, and obtain the domain name, project name, and project ID on the <strong id="elb_faq_0065__en-us_topic_0040259342_b1956165671712">My Credentials</strong> page.</p>
<ul id="elb_faq_0065__en-us_topic_0040259342_ul37351029162712"><li id="elb_faq_0065__en-us_topic_0040259342_li12735132932714">Domain name, project name, and project ID, which can be obtained by performing the following operations:<p id="elb_faq_0065__en-us_topic_0040259342_p1973542918275"><a name="elb_faq_0065__en-us_topic_0040259342_li12735132932714"></a><a name="en-us_topic_0040259342_li12735132932714"></a>Log in to the management console using the cloud account, click the username in the upper right corner, select <strong id="elb_faq_0065__b199058716131">My Credentials</strong> from the drop-down list, and obtain the domain name, project name, and project ID on the <strong id="elb_faq_0065__b1590527191315">My Credentials</strong> page.</p>
</li><li id="elb_faq_0065__en-us_topic_0040259342_li13735182917270">Quota information, which includes:<ul id="elb_faq_0065__en-us_topic_0040259342_ul6735102912273"><li id="elb_faq_0065__en-us_topic_0040259342_li1073516296277">Service name</li><li id="elb_faq_0065__en-us_topic_0040259342_li6735152972712">Quota type</li><li id="elb_faq_0065__en-us_topic_0040259342_li773592992718">Required quota</li></ul>
</li></ul>
<p id="elb_faq_0065__en-us_topic_0040259342_p126761744182712"><a href="https://open-telekom-cloud.com/en/contact" target="_blank" rel="noopener noreferrer">Learn how to obtain the service hotline and email address.</a></p>

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<h1 class="topictitle1">What Types of Sticky Sessions Does ELB Support?</h1>
<div id="body1437669816817"><p id="elb_faq_0085__p8292617145212">Dedicated load balancers: <strong id="elb_faq_0085__b230520591448">Source IP address</strong> and <strong id="elb_faq_0085__b1131715911446">Load balancer cookie</strong></p>
<p id="elb_faq_0085__p528462741203"><span id="elb_faq_0085__ph15170164618279">Shared</span> load balancers: <strong id="elb_faq_0085__b3335228194515">Source IP address</strong>, <strong id="elb_faq_0085__b333113404510">Load balancer cookie</strong>, and <strong id="elb_faq_0085__b910418384459">Application cookie</strong></p>
<p id="elb_faq_0085__p528462741203"><span id="elb_faq_0085__ph15170164618279">Shared</span> load balancers: <strong id="elb_faq_0085__b1635643422917">Source IP address</strong>, <strong id="elb_faq_0085__b4696203814294">Load balancer cookie</strong>, and <strong id="elb_faq_0085__b167271343112910">Application cookie</strong></p>
</div>
<div>
<div class="familylinks">

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<p id="elb_faq_0090__p157754342011">For load balancing at Layer 4 (TCP/UDP), you can enable <strong id="elb_faq_0090__b16174151214303">Transfer Client IP Address</strong> to obtain the source IP address.</p>
<ul id="elb_faq_0090__ul3140135223013"><li id="elb_faq_0090__li13140155233012"><strong id="elb_faq_0090__b6980112313279">Method 1 (for TCP or UDP listeners)</strong>: Enable <strong id="elb_faq_0090__b101155618413">Transfer Client IP Address</strong>.<div class="caution" id="elb_faq_0090__note163721259193419"><span class="cautiontitle"><img src="public_sys-resources/caution_3.0-en-us.png"> </span><div class="cautionbody"><ul id="elb_faq_0090__ul0161183124115"><li id="elb_faq_0090__li11982310114212">After this function is enabled, traffic, such as unidirectional download or push traffic, may be interrupted when backend servers are being migrated during the migration of the associated classic load balancer. After backend servers are migrated, retransmit the packets to restore the traffic.</li><li id="elb_faq_0090__li03069573459">After this function is enabled, the associated backend servers cannot be used as clients to access the listener.</li><li id="elb_faq_0090__li142889194478">If a backend server has been associated with the listener and health checks are enabled, enabling this function will check the health of the backend server, and traffic to this server will be interrupted for two health check intervals.</li></ul>
</div></div>
<ol id="elb_faq_0090__ol730222417346"><li id="elb_faq_0090__li330222433410">Perform the following steps to enable the function:<ol type="a" id="elb_faq_0090__ol16390953185514"><li id="elb_faq_0090__li677391520332">Log in to the management console.</li><li id="elb_faq_0090__li675519100420">In the upper left corner of the page, click <span><img id="elb_faq_0090__image77755232952126" src="en-us_image_0000001747739624.png"></span> and select the desired region and project.</li><li id="elb_faq_0090__li194625132711">Click <span><img id="elb_faq_0090__image208721291952130" src="en-us_image_0000001794660485.png"></span> in the upper left corner to display <strong id="elb_faq_0090__b49993403052130">Service List</strong> and choose <strong id="elb_faq_0090__b88819871252130">Network</strong> &gt; <strong id="elb_faq_0090__b34359211152130">Elastic Load Balancing</strong>.</li><li id="elb_faq_0090__li1379615339436">In the load balancer list, click the name of the load balancer.</li><li id="elb_faq_0090__li475294174319">Click <strong id="elb_faq_0090__b1231197849">Listeners</strong>.<ul id="elb_faq_0090__ul124372032185517"><li id="elb_faq_0090__li543763255519">To add a listener, click <strong id="elb_faq_0090__b1377149182415">Add Listener</strong>.</li><li id="elb_faq_0090__li12437132115511">To modify a listener, locate the listener, click <span><img id="elb_faq_0090__image18771457113315" src="en-us_image_0000001747740100.png"></span> on the right of its name, and click <strong id="elb_faq_0090__b388015743316">Modify Listener</strong>. In the <strong id="elb_faq_0090__b6881165715337">Modify Listener</strong> dialog box, modify the parameters as needed.</li></ul>
<ol id="elb_faq_0090__ol730222417346"><li id="elb_faq_0090__li330222433410">Perform the following steps to enable the function:<ol type="a" id="elb_faq_0090__ol16390953185514"><li id="elb_faq_0090__li677391520332">Log in to the management console.</li><li id="elb_faq_0090__li675519100420">In the upper left corner of the page, click <span><img id="elb_faq_0090__image77755232952126" src="en-us_image_0000001747739624.png"></span> and select the desired region and project.</li><li id="elb_faq_0090__li194625132711">Click <span><img id="elb_faq_0090__image208721291952130" src="en-us_image_0000001794660485.png"></span> in the upper left corner to display <strong id="elb_faq_0090__b49993403052130">Service List</strong> and choose <strong id="elb_faq_0090__b88819871252130">Network</strong> &gt; <strong id="elb_faq_0090__b34359211152130">Elastic Load Balancing</strong>.</li><li id="elb_faq_0090__li1379615339436">In the load balancer list, click the name of the load balancer.</li><li id="elb_faq_0090__li475294174319">Click <strong id="elb_faq_0090__b1155547559">Listeners</strong>.<ul id="elb_faq_0090__ul124372032185517"><li id="elb_faq_0090__li543763255519">To add a listener, click <strong id="elb_faq_0090__b1377149182415">Add Listener</strong>.</li><li id="elb_faq_0090__li12437132115511">To modify a listener, locate the listener, click <span><img id="elb_faq_0090__image18771457113315" src="en-us_image_0000001747740100.png"></span> on the right of its name, and click <strong id="elb_faq_0090__b388015743316">Modify Listener</strong>. In the <strong id="elb_faq_0090__b6881165715337">Modify Listener</strong> dialog box, modify the parameters as needed.</li></ul>
</li><li id="elb_faq_0090__li3100135715344">Enable <strong id="elb_faq_0090__b745821111385">Transfer Client IP Address</strong>.</li></ol>
</li><li id="elb_faq_0090__li99008095116">Configure security groups, firewalls, and OS and software security policies so that IP addresses of the clients can access these backend servers.<div class="note" id="elb_faq_0090__note9800635192119"><img src="public_sys-resources/note_3.0-en-us.png"><span class="notetitle"> </span><div class="notebody"><p id="elb_faq_0090__p17774359172118">If <strong id="elb_faq_0090__b102626566293">Transfer Client IP Address</strong> is enabled, a server cannot serve as both a backend server and a client. If the client and the backend server use the same server and the <strong id="elb_faq_0090__b1651062122">Transfer Client IP Address</strong> option is enabled, the backend server will think the packet from the client is sent by itself and will not return a response packet to the load balancer. As a result, the return traffic will be interrupted.</p>
</li><li id="elb_faq_0090__li99008095116">Configure security groups, firewalls, and OS and software security policies so that IP addresses of the clients can access these backend servers.<div class="note" id="elb_faq_0090__note9800635192119"><img src="public_sys-resources/note_3.0-en-us.png"><span class="notetitle"> </span><div class="notebody"><p id="elb_faq_0090__p17774359172118">If <strong id="elb_faq_0090__b102626566293">Transfer Client IP Address</strong> is enabled, a server cannot serve as both a backend server and a client. If the client and the backend server use the same server and the <strong id="elb_faq_0090__b1339535158">Transfer Client IP Address</strong> option is enabled, the backend server will think the packet from the client is sent by itself and will not return a response packet to the load balancer. As a result, the return traffic will be interrupted.</p>
</div></div>
</li></ol>
</li></ul>

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<a name="elb_faq_0212"></a><a name="elb_faq_0212"></a>
<h1 class="topictitle1">ELB Use</h1>
<div id="body1590575971686"><p id="elb_faq_0212__p8060118"></p>
<h1 class="topictitle1">ELB Use</h1>
<div id="body1590575971686"><p id="elb_faq_0212__p8060118"></p>
</div>
<div>
<ul class="ullinks">
<li class="ulchildlink"><strong><a href="elb_faq_0211.html">ELB Functionality</a></strong><br>

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<a name="elb_faq_210202201"></a><a name="elb_faq_210202201"></a>
<h1 class="topictitle1">Can I Change the VPC and Subnet for My Load Balancer?</h1>
<div id="body0000001239766097"><p id="elb_faq_210202201__p12192155443316">You cannot change the VPC and subnet for your <span id="elb_faq_210202201__ph84821558185815">Shared</span> load balancers.</p>
<div id="body0000001239766097"><p id="elb_faq_210202201__p12192155443316">You cannot change the VPC and subnet for your shared load balancers.</p>
<p id="elb_faq_210202201__p194699943016">You can change the subnet but not the VPC for your dedicated load balancers.</p>
</div>
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<a name="elb_faq_21020221"></a><a name="elb_faq_21020221"></a>
<h1 class="topictitle1">Can I Upgrade a Shared Load Balancer to a Dedicated Load Balancer Without Interrupting Traffic Routing?</h1>
<div id="body0000001239938081"><p id="elb_faq_21020221__p652461555620">No. <span id="elb_faq_21020221__ph84821558185815">Shared</span> load balancers cannot be upgraded to dedicated load balancers.</p>
<div id="body0000001239938081"><p id="elb_faq_21020221__p652461555620">No. Shared load balancers cannot be upgraded to dedicated load balancers.</p>
</div>
<div>
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<h1 class="topictitle1">Do Shared Load Balancers Have Specifications?</h1>
<div id="body0000001215061331"><p id="elb_faq_210310__p17551181282311">No.</p>
<p id="elb_faq_210310__p2391181152311"><span id="elb_faq_210310__ph1645535710329">Shared</span> load balancers share underlying resources, and the performance of one load balancer is affected by other load balancers. Only dedicated load balancers have exclusive use of their underlying resources. The performance of a dedicated load balancer is not affected by other dedicated load balancers on the Internet.</p>
<p id="elb_faq_210310__p2391181152311">Shared load balancers share underlying resources, and the performance of one load balancer is affected by other load balancers. Only dedicated load balancers have exclusive use of their underlying resources. The performance of a dedicated load balancer is not affected by other dedicated load balancers on the Internet.</p>
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<td class="cellrowborder" valign="top" width="54.58%" headers="mcps1.3.4.2.4.4.2.4.1.2 "><p id="elb_lb_000006__p10621134115462">Specifies the AZ of the load balancer. You can deploy a load balancer in multiple AZs for high availability. If an AZ becomes faulty or unavailable, the load balancers in other AZs can route requests to backend servers to ensure service continuity and improve application reliability.</p>
<p id="elb_lb_000006__p762124194615">If you deploy a load balancer in multiple AZs, its performance such as the number of new connections and the number of concurrent connections will multiply. For example, if you deploy a dedicated load balancer in two AZs, it can handle up to 40 million concurrent connections.</p>
<div class="note" id="elb_lb_000006__note13711571720"><span class="notetitle"> NOTE: </span><div class="notebody"><p id="elb_lb_000006__p971871274">By default, all AZs are selected. You can select the AZs as needed.</p>
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<div class="note" id="elb_lb_000006__note17621194115460"><span class="notetitle"> NOTE: </span><div class="notebody"><ul id="elb_lb_000006__en-us_topic_0091131368_ul923217451122"><li id="elb_lb_000006__en-us_topic_0091131368_li17232345111210">If requests are from the Internet, the load balancer in each AZ you select routes the requests based on source IP addresses. If you deploy a load balancer in two AZs, the requests the load balancers can handle will be doubled.</li><li id="elb_lb_000006__en-us_topic_0091131368_li0765191117216">For requests from a private network:<ul id="elb_lb_000006__en-us_topic_0091131368_ul187611211172118"><li id="elb_lb_000006__en-us_topic_0091131368_li13767152811815">If clients are in an AZ you have selected when you created the load balancer, requests are distributed by the load balancer in this AZ. If the load balancer becomes unavailable, requests are distributed by the load balancer in another AZ you have selected.<p id="elb_lb_000006__en-us_topic_0091131368_p93011631387"><a name="elb_lb_000006__en-us_topic_0091131368_li13767152811815"></a><a name="en-us_topic_0091131368_li13767152811815"></a>If the load balancer is available but the connections that the load balancer needs to handle exceed the amount defined in the specifications, service may be interrupted. To address this issue, you need upgrade specifications. </p>
</li><li id="elb_lb_000006__en-us_topic_0091131368_li18762161119217">If clients are in an AZ that is not selected when you created the load balancer, requests are distributed by the load balancer in each AZ you select based on source IP addresses.</li></ul>
</li><li id="elb_lb_000006__en-us_topic_0091131368_li85501156567">If requests are from a Direct Connect connection, the load balancer in the same AZ as the Direct Connect connection routes the requests. If the load balancer is unavailable, requests are distributed by the load balancer in another AZ.</li><li id="elb_lb_000006__en-us_topic_0091131368_li147061182517">If clients are in a VPC that is different from where the load balancer works, the load balancer in the AZ where the original VPC subnet resides routes the requests. If the load balancer is unavailable, requests are distributed by the load balancer in another AZ.</li></ul>

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<h1 class="topictitle1">Adding to or Removing from an IPv6 Shared Bandwidth</h1>
<div id="body8662426"><div class="section" id="elb_lb_000011__en-us_topic_0195284111_section57040304257"><h4 class="sectiontitle">Scenarios</h4><p id="elb_lb_000011__en-us_topic_0195284111_p9663124616522">After you bind an IPv6 address to a <span id="elb_lb_000011__ph19311514345">dedicated load balancer</span>, you can add the load balancer to a shared bandwidth to enable it to route requests over the Internet. After you are finished with the shared bandwidth, you can remove the load balancer from the shared bandwidth, so that it can only route requests within a VPC.</p>
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<div class="section" id="elb_lb_000011__en-us_topic_0195284111_section6757112293418"><h4 class="sectiontitle">Adding to an IPv6 Shared Bandwidth</h4><ol id="elb_lb_000011__en-us_topic_0195284111_ol12841946133714"><li id="elb_lb_000011__en-us_topic_0195284111_li1609750152920">Log in to the management console.</li><li id="elb_lb_000011__en-us_topic_0195284111_en-us_topic_0167652100_li66461182152949">In the upper left corner of the page, click <span><img id="elb_lb_000011__en-us_topic_0240829509_image1542118117117" src="en-us_image_0000001747739624.png"></span> and select the desired region and project.</li><li id="elb_lb_000011__li78811227131312">Hover on <span><img id="elb_lb_000011__en-us_topic_0167652100_image762510132322" src="en-us_image_0000001794660485.png"></span> in the upper left corner to display <strong id="elb_lb_000011__en-us_topic_0167652100_b9121102522212">Service List</strong> and choose <strong id="elb_lb_000011__en-us_topic_0167652100_b61222025142217">Network</strong> &gt; <strong id="elb_lb_000011__en-us_topic_0167652100_b4124425142210">Elastic Load Balancing</strong>. </li><li id="elb_lb_000011__en-us_topic_0195284111_li132857467375">On the <strong id="elb_lb_000011__b186635914313">Load Balancers</strong> page, locate the load balancer that you want to add to a shared bandwidth, and click <strong id="elb_lb_000011__b1971125911432">More</strong> &gt; <strong id="elb_lb_000011__b8728593433">Add to IPv6 Shared Bandwidth</strong> in the <strong id="elb_lb_000011__b18721659154313">Operation</strong> column.</li><li id="elb_lb_000011__en-us_topic_0195284111_li16285546193712">In the <strong id="elb_lb_000011__b269014415444">Add to IPv6 Shared Bandwidth</strong> dialog box, select the shared bandwidth to which you want to add the dedicated load balancer.<p id="elb_lb_000011__en-us_topic_0195284111_p193851641162814">If no shared bandwidths are available, buy one as prompted.</p>
<div class="section" id="elb_lb_000011__en-us_topic_0195284111_section6757112293418"><h4 class="sectiontitle">Adding to an IPv6 Shared Bandwidth</h4><ol id="elb_lb_000011__en-us_topic_0195284111_ol12841946133714"><li id="elb_lb_000011__en-us_topic_0195284111_li1609750152920">Log in to the management console.</li><li id="elb_lb_000011__en-us_topic_0195284111_en-us_topic_0167652100_li66461182152949">In the upper left corner of the page, click <span><img id="elb_lb_000011__image12257593411175" src="en-us_image_0000001747739624.png"></span> and select the desired region and project.</li><li id="elb_lb_000011__li78811227131312">Click <span><img id="elb_lb_000011__image667972512818" src="en-us_image_0000001794660485.png"></span> in the upper left corner to display <strong id="elb_lb_000011__b46796255819">Service List</strong> and choose <strong id="elb_lb_000011__b467912254814">Network</strong> &gt; <strong id="elb_lb_000011__b1567918252813">Elastic Load Balancing</strong>.</li><li id="elb_lb_000011__en-us_topic_0195284111_li132857467375">On the <strong id="elb_lb_000011__b186635914313">Load Balancers</strong> page, locate the load balancer that you want to add to a shared bandwidth, and click <strong id="elb_lb_000011__b1971125911432">More</strong> &gt; <strong id="elb_lb_000011__b8728593433">Add to IPv6 Shared Bandwidth</strong> in the <strong id="elb_lb_000011__b18721659154313">Operation</strong> column.</li><li id="elb_lb_000011__en-us_topic_0195284111_li16285546193712">In the <strong id="elb_lb_000011__b269014415444">Add to IPv6 Shared Bandwidth</strong> dialog box, select the shared bandwidth to which you want to add the dedicated load balancer.<p id="elb_lb_000011__en-us_topic_0195284111_p193851641162814">If no shared bandwidths are available, buy one as prompted.</p>
</li><li id="elb_lb_000011__en-us_topic_0195284111_li1285146153710">Click <strong id="elb_lb_000011__en-us_topic_0195284111_b118532122503">OK</strong>.</li></ol>
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<div class="section" id="elb_lb_000011__en-us_topic_0195284111_section6550103182516"><h4 class="sectiontitle">Removing from an IPv6 Shared Bandwidth</h4><ol id="elb_lb_000011__en-us_topic_0195284111_ol17550113132512"><li id="elb_lb_000011__en-us_topic_0195284111_li4516759173014">Log in to the management console.</li><li id="elb_lb_000011__en-us_topic_0195284111_li1492114294188">In the upper left corner of the page, click <span><img id="elb_lb_000011__en-us_topic_0240829509_image1542118117117_1" src="en-us_image_0000001747739624.png"></span> and select the desired region and project.</li><li id="elb_lb_000011__li98744126361">Hover on <span><img id="elb_lb_000011__en-us_topic_0167652100_image762510132322_1" src="en-us_image_0000001794660485.png"></span> in the upper left corner to display <strong id="elb_lb_000011__en-us_topic_0167652100_b9121102522212_1">Service List</strong> and choose <strong id="elb_lb_000011__en-us_topic_0167652100_b61222025142217_1">Network</strong> &gt; <strong id="elb_lb_000011__en-us_topic_0167652100_b4124425142210_1">Elastic Load Balancing</strong>. </li><li id="elb_lb_000011__en-us_topic_0195284111_li7550183152517">On the <strong id="elb_lb_000011__en-us_topic_0195284111_b879142218419">Load Balancers</strong> page, locate the load balancer that you want to remove from a shared bandwidth, and click <strong id="elb_lb_000011__en-us_topic_0195284111_b18793922544">More</strong> &gt; <strong id="elb_lb_000011__en-us_topic_0195284111_b47958223416">Remove from IPv6 Shared Bandwidth</strong> in the <strong id="elb_lb_000011__en-us_topic_0195284111_b87977227418">Operation</strong> column.</li><li id="elb_lb_000011__en-us_topic_0195284111_li1655014313253">In the displayed dialog box, confirm the shared bandwidth from which you want to remove the load balancer.<div class="note" id="elb_lb_000011__en-us_topic_0195284111_note16835115125512"><img src="public_sys-resources/note_3.0-en-us.png"><span class="notetitle"> </span><div class="notebody"><p id="elb_lb_000011__en-us_topic_0195284111_p942923195615">After the load balancer is removed from the shared bandwidth, the load balancer cannot route requests over the Internet.</p>
<div class="section" id="elb_lb_000011__en-us_topic_0195284111_section6550103182516"><h4 class="sectiontitle">Removing from an IPv6 Shared Bandwidth</h4><ol id="elb_lb_000011__en-us_topic_0195284111_ol17550113132512"><li id="elb_lb_000011__en-us_topic_0195284111_li4516759173014">Log in to the management console.</li><li id="elb_lb_000011__en-us_topic_0195284111_li1492114294188">In the upper left corner of the page, click <span><img id="elb_lb_000011__image14918174521175" src="en-us_image_0000001747739624.png"></span> and select the desired region and project.</li><li id="elb_lb_000011__li98744126361">Click <span><img id="elb_lb_000011__image166241526681" src="en-us_image_0000001794660485.png"></span> in the upper left corner to display <strong id="elb_lb_000011__b562413261989">Service List</strong> and choose <strong id="elb_lb_000011__b116243261189">Network</strong> &gt; <strong id="elb_lb_000011__b162418261587">Elastic Load Balancing</strong>.</li><li id="elb_lb_000011__en-us_topic_0195284111_li7550183152517">On the <strong id="elb_lb_000011__en-us_topic_0195284111_b879142218419">Load Balancers</strong> page, locate the load balancer that you want to remove from a shared bandwidth, and click <strong id="elb_lb_000011__en-us_topic_0195284111_b18793922544">More</strong> &gt; <strong id="elb_lb_000011__en-us_topic_0195284111_b47958223416">Remove from IPv6 Shared Bandwidth</strong> in the <strong id="elb_lb_000011__en-us_topic_0195284111_b87977227418">Operation</strong> column.</li><li id="elb_lb_000011__en-us_topic_0195284111_li1655014313253">In the displayed dialog box, confirm the shared bandwidth from which you want to remove the load balancer.<div class="note" id="elb_lb_000011__en-us_topic_0195284111_note16835115125512"><img src="public_sys-resources/note_3.0-en-us.png"><span class="notetitle"> </span><div class="notebody"><p id="elb_lb_000011__en-us_topic_0195284111_p942923195615">After the load balancer is removed from the shared bandwidth, the load balancer cannot route requests over the Internet.</p>
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</li><li id="elb_lb_000011__en-us_topic_0195284111_li655033102512">Click <strong id="elb_lb_000011__en-us_topic_0195284111_b952392235519">Yes</strong>.</li></ol>
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<h1 class="topictitle1">Basic Concepts</h1>
<div id="body1567992509085">
<div class="tablenoborder"><table cellpadding="4" cellspacing="0" summary="" id="elb_pro_0001__table17643195014453" frame="border" border="1" rules="all"><caption><b>Table 1 </b>Some concepts about ELB</caption><thead align="left"><tr id="elb_pro_0001__row1644350164511"><th align="left" class="cellrowborder" valign="top" width="18%" id="mcps1.3.1.2.3.1.1"><p id="elb_pro_0001__p864415064515">Term</p>
<div class="tablenoborder"><table cellpadding="4" cellspacing="0" summary="" id="elb_pro_0001__table17643195014453" frame="border" border="1" rules="all"><caption><b>Table 1 </b>Some concepts about ELB</caption><thead align="left"><tr id="elb_pro_0001__row1644350164511"><th align="left" class="cellrowborder" valign="top" width="15.49%" id="mcps1.3.1.2.3.1.1"><p id="elb_pro_0001__p864415064515">Term</p>
</th>
<th align="left" class="cellrowborder" valign="top" width="82%" id="mcps1.3.1.2.3.1.2"><p id="elb_pro_0001__p96442503458">Definition</p>
<th align="left" class="cellrowborder" valign="top" width="84.50999999999999%" id="mcps1.3.1.2.3.1.2"><p id="elb_pro_0001__p96442503458">Definition</p>
</th>
</tr>
</thead>
<tbody><tr id="elb_pro_0001__row864475011450"><td class="cellrowborder" valign="top" width="18%" headers="mcps1.3.1.2.3.1.1 "><p id="elb_pro_0001__p4644135024515">Load balancer</p>
<tbody><tr id="elb_pro_0001__row864475011450"><td class="cellrowborder" valign="top" width="15.49%" headers="mcps1.3.1.2.3.1.1 "><p id="elb_pro_0001__p4644135024515">Load balancer</p>
</td>
<td class="cellrowborder" valign="top" width="82%" headers="mcps1.3.1.2.3.1.2 "><p id="elb_pro_0001__p3644250144511">A load balancer distributes incoming traffic across backend servers.</p>
<td class="cellrowborder" valign="top" width="84.50999999999999%" headers="mcps1.3.1.2.3.1.2 "><p id="elb_pro_0001__p3644250144511">A load balancer distributes incoming traffic across backend servers.</p>
</td>
</tr>
<tr id="elb_pro_0001__row17644115034512"><td class="cellrowborder" valign="top" width="18%" headers="mcps1.3.1.2.3.1.1 "><p id="elb_pro_0001__p186441250134518">Listener</p>
<tr id="elb_pro_0001__row17644115034512"><td class="cellrowborder" valign="top" width="15.49%" headers="mcps1.3.1.2.3.1.1 "><p id="elb_pro_0001__p186441250134518">Listener</p>
</td>
<td class="cellrowborder" valign="top" width="82%" headers="mcps1.3.1.2.3.1.2 "><p id="elb_pro_0001__p2644950114515">A listener listens on requests from clients and routes the requests to backend <span id="elb_pro_0001__text64561152173613">server</span>s based on the settings that you configure when you add the listener.</p>
<td class="cellrowborder" valign="top" width="84.50999999999999%" headers="mcps1.3.1.2.3.1.2 "><p id="elb_pro_0001__p2644950114515">A listener listens on requests from clients and routes the requests to backend servers based on the settings that you configure when you add the listener.</p>
</td>
</tr>
<tr id="elb_pro_0001__row1364411502455"><td class="cellrowborder" valign="top" width="18%" headers="mcps1.3.1.2.3.1.1 "><p id="elb_pro_0001__p15644155084519">Backend server</p>
<tr id="elb_pro_0001__row1364411502455"><td class="cellrowborder" valign="top" width="15.49%" headers="mcps1.3.1.2.3.1.1 "><p id="elb_pro_0001__p15644155084519">Backend server</p>
</td>
<td class="cellrowborder" valign="top" width="82%" headers="mcps1.3.1.2.3.1.2 "><p id="elb_pro_0001__p1464425016457">A backend server is a cloud server added to a backend <span id="elb_pro_0001__en-us_topic_0164706624_text134779184156">server</span> group associated with a load balancer. When you add a listener to a load balancer, you can create or select a backend <span id="elb_pro_0001__en-us_topic_0164706624_text01565413152">server</span> group to receive requests from the load balancer by using the port and protocol you specify for the backend <span id="elb_pro_0001__en-us_topic_0164706624_text12774182671815">server</span> group and the load balancing algorithm you select.</p>
<td class="cellrowborder" valign="top" width="84.50999999999999%" headers="mcps1.3.1.2.3.1.2 "><p id="elb_pro_0001__p1464425016457">A backend server is a cloud server added to a backend server group associated with a load balancer. When you add a listener to a load balancer, you can create or select a backend server group to receive requests from the load balancer by using the port and protocol you specify for the backend server group and the load balancing algorithm you select.</p>
</td>
</tr>
<tr id="elb_pro_0001__row19644950204515"><td class="cellrowborder" valign="top" width="18%" headers="mcps1.3.1.2.3.1.1 "><p id="elb_pro_0001__p156441850134517">Backend server group</p>
<tr id="elb_pro_0001__row19644950204515"><td class="cellrowborder" valign="top" width="15.49%" headers="mcps1.3.1.2.3.1.1 "><p id="elb_pro_0001__p156441850134517">Backend server group</p>
</td>
<td class="cellrowborder" valign="top" width="82%" headers="mcps1.3.1.2.3.1.2 "><p id="elb_pro_0001__p20644145034510">A backend server group is a collection of cloud servers that have same features. When you add a listener, you select a load balancing algorithm and create or select a backend server group. Incoming traffic is routed to the corresponding backend server group based on the listener's configuration.</p>
<td class="cellrowborder" valign="top" width="84.50999999999999%" headers="mcps1.3.1.2.3.1.2 "><p id="elb_pro_0001__p20644145034510">A backend server group is a collection of cloud servers that have same features. When you add a listener, you select a load balancing algorithm and create or select a backend server group. Incoming traffic is routed to the corresponding backend server group based on the listener's configuration.</p>
</td>
</tr>
<tr id="elb_pro_0001__row7644165084514"><td class="cellrowborder" valign="top" width="18%" headers="mcps1.3.1.2.3.1.1 "><p id="elb_pro_0001__p4644205015458">Health check</p>
<tr id="elb_pro_0001__row7644165084514"><td class="cellrowborder" valign="top" width="15.49%" headers="mcps1.3.1.2.3.1.1 "><p id="elb_pro_0001__p4644205015458">Health check</p>
</td>
<td class="cellrowborder" valign="top" width="82%" headers="mcps1.3.1.2.3.1.2 "><p id="elb_pro_0001__p9644125014451">ELB periodically sends requests to backend <span id="elb_pro_0001__en-us_topic_0164706629_text174345265419">server</span>s to check whether they can process requests. If a backend <span id="elb_pro_0001__en-us_topic_0164706629_text442602317545">server</span> is detected as unhealthy, the load balancer stops routing requests to it. After the backend <span id="elb_pro_0001__en-us_topic_0164706629_text854154645414">server</span> recovers, the load balancer will resume routing requests to it.</p>
<td class="cellrowborder" valign="top" width="84.50999999999999%" headers="mcps1.3.1.2.3.1.2 "><p id="elb_pro_0001__p9644125014451">Load balancers periodically send requests to backend servers to check whether they can process requests. If a backend server is detected as unhealthy, the load balancer stops routing requests to it. After the backend server recovers, the load balancer resumes routing requests to it.</p>
</td>
</tr>
<tr id="elb_pro_0001__row20644450204518"><td class="cellrowborder" valign="top" width="18%" headers="mcps1.3.1.2.3.1.1 "><p id="elb_pro_0001__p1964418505454">Redirect</p>
<tr id="elb_pro_0001__row20644450204518"><td class="cellrowborder" valign="top" width="15.49%" headers="mcps1.3.1.2.3.1.1 "><p id="elb_pro_0001__p1964418505454">Redirect</p>
</td>
<td class="cellrowborder" valign="top" width="82%" headers="mcps1.3.1.2.3.1.2 "><p id="elb_pro_0001__p5644135015457">HTTPS is an extension of HTTP. HTTPS encrypts data between a web server and a browser.</p>
<td class="cellrowborder" valign="top" width="84.50999999999999%" headers="mcps1.3.1.2.3.1.2 "><p id="elb_pro_0001__p5644135015457">HTTPS is an extension of HTTP. HTTPS encrypts data between a web server and a browser.</p>
</td>
</tr>
<tr id="elb_pro_0001__row364405094516"><td class="cellrowborder" valign="top" width="18%" headers="mcps1.3.1.2.3.1.1 "><p id="elb_pro_0001__p5462101841813">Sticky session</p>
<tr id="elb_pro_0001__row364405094516"><td class="cellrowborder" valign="top" width="15.49%" headers="mcps1.3.1.2.3.1.1 "><p id="elb_pro_0001__p5462101841813">Sticky session</p>
</td>
<td class="cellrowborder" valign="top" width="82%" headers="mcps1.3.1.2.3.1.2 "><p id="elb_pro_0001__p1564418504452">Sticky sessions ensure that requests from a client always get routed to the same backend server before a session elapses.</p>
<td class="cellrowborder" valign="top" width="84.50999999999999%" headers="mcps1.3.1.2.3.1.2 "><p id="elb_pro_0001__p1564418504452">Sticky sessions ensure that requests from a client always get routed to the same backend server before a session elapses.</p>
</td>
</tr>
<tr id="elb_pro_0001__row564410505454"><td class="cellrowborder" valign="top" width="18%" headers="mcps1.3.1.2.3.1.1 "><p id="elb_pro_0001__p7644750164517">WebSocket</p>
<tr id="elb_pro_0001__row564410505454"><td class="cellrowborder" valign="top" width="15.49%" headers="mcps1.3.1.2.3.1.1 "><p id="elb_pro_0001__p7644750164517">WebSocket</p>
</td>
<td class="cellrowborder" valign="top" width="82%" headers="mcps1.3.1.2.3.1.2 "><p id="elb_pro_0001__p17963155112120">WebSocket is a new HTML5 protocol that provides full-duplex communication between the browser and the server. WebSocket saves server resources and bandwidth, and enables real-time communication. Both WebSocket and HTTP depend on TCP to transmit data. A handshake connection is required between the browser and server, so that they can communicate with each other only after the connection is established. However, as a bidirectional communication protocol, WebSocket is different from HTTP. After the handshake succeeds, both the server and browser (or client agent) can actively send data to or receive data from each other.</p>
<td class="cellrowborder" valign="top" width="84.50999999999999%" headers="mcps1.3.1.2.3.1.2 "><p id="elb_pro_0001__p17963155112120">WebSocket is a new HTML5 protocol that provides full-duplex communication between the browser and the server. WebSocket saves server resources and bandwidth, and enables real-time communication. Both WebSocket and HTTP depend on TCP to transmit data. A handshake connection is required between the browser and server, so that they can communicate with each other only after the connection is established. However, as a bidirectional communication protocol, WebSocket is different from HTTP. After the handshake succeeds, both the server and browser (or client agent) can actively send data to or receive data from each other.</p>
</td>
</tr>
<tr id="elb_pro_0001__row3644145013456"><td class="cellrowborder" valign="top" width="18%" headers="mcps1.3.1.2.3.1.1 "><p id="elb_pro_0001__p064585018451">SNI</p>
<tr id="elb_pro_0001__row3644145013456"><td class="cellrowborder" valign="top" width="15.49%" headers="mcps1.3.1.2.3.1.1 "><p id="elb_pro_0001__p064585018451">SNI</p>
</td>
<td class="cellrowborder" valign="top" width="82%" headers="mcps1.3.1.2.3.1.2 "><p id="elb_pro_0001__p564595064516">SNI, an extension to Transport Layer Security (TLS), enables a server to present multiple certificates on the same IP address and port number. SNI allows the client to indicate the domain name of the website while sending an SSL handshake request. Once receiving the request, the load balancer queries the right certificate based on the hostname or domain name and returns the certificate to the client. If no certificate is found, the load balancer will return the default certificate.</p>
<td class="cellrowborder" valign="top" width="84.50999999999999%" headers="mcps1.3.1.2.3.1.2 "><p id="elb_pro_0001__p564595064516">SNI, an extension to Transport Layer Security (TLS), enables a server to present multiple certificates on the same IP address and port number. SNI allows the client to indicate the domain name of the website while sending an SSL handshake request. Once receiving the request, the load balancer queries the right certificate based on the hostname or domain name and returns the certificate to the client. If no certificate is found, the load balancer will return the default certificate.</p>
</td>
</tr>
<tr id="elb_pro_0001__row1264545054512"><td class="cellrowborder" valign="top" width="18%" headers="mcps1.3.1.2.3.1.1 "><p id="elb_pro_0001__p1764525015454">Persistent connection</p>
<tr id="elb_pro_0001__row1264545054512"><td class="cellrowborder" valign="top" width="15.49%" headers="mcps1.3.1.2.3.1.1 "><p id="elb_pro_0001__p1764525015454">Persistent connection</p>
</td>
<td class="cellrowborder" valign="top" width="82%" headers="mcps1.3.1.2.3.1.2 "><p id="elb_pro_0001__p96451550104515">A persistent connection allows multiple data packets to be sent continuously over a TCP connection. If no data packet is sent during the connection, the client and server send link detection packets to each other to maintain the connection.</p>
<td class="cellrowborder" valign="top" width="84.50999999999999%" headers="mcps1.3.1.2.3.1.2 "><p id="elb_pro_0001__p96451550104515">A persistent connection allows multiple data packets to be sent continuously over a TCP connection. If no data packet is sent during the connection, the client and server send link detection packets to each other to maintain the connection.</p>
</td>
</tr>
<tr id="elb_pro_0001__row46458501457"><td class="cellrowborder" valign="top" width="18%" headers="mcps1.3.1.2.3.1.1 "><p id="elb_pro_0001__p26451050184518">Short connection</p>
<tr id="elb_pro_0001__row46458501457"><td class="cellrowborder" valign="top" width="15.49%" headers="mcps1.3.1.2.3.1.1 "><p id="elb_pro_0001__p26451050184518">Short connection</p>
</td>
<td class="cellrowborder" valign="top" width="82%" headers="mcps1.3.1.2.3.1.2 "><p id="elb_pro_0001__p15645125017455">A short connection is a connection established when data is exchanged between the client and server and immediately closed after the data is sent.</p>
<td class="cellrowborder" valign="top" width="84.50999999999999%" headers="mcps1.3.1.2.3.1.2 "><p id="elb_pro_0001__p15645125017455">A short connection is a connection established when data is exchanged between the client and server and immediately closed after the data is sent.</p>
</td>
</tr>
<tr id="elb_pro_0001__row91101346807"><td class="cellrowborder" valign="top" width="18%" headers="mcps1.3.1.2.3.1.1 "><p id="elb_pro_0001__p1811116467011">Concurrent connection</p>
<tr id="elb_pro_0001__row91101346807"><td class="cellrowborder" valign="top" width="15.49%" headers="mcps1.3.1.2.3.1.1 "><p id="elb_pro_0001__p1811116467011">Concurrent connection</p>
</td>
<td class="cellrowborder" valign="top" width="82%" headers="mcps1.3.1.2.3.1.2 "><p id="elb_pro_0001__p7111134616018">Concurrent connections are total number of TCP connections initiated by clients and routed to backend servers by a load balancer per second.</p>
<td class="cellrowborder" valign="top" width="84.50999999999999%" headers="mcps1.3.1.2.3.1.2 "><p id="elb_pro_0001__p7111134616018">Concurrent connections are total number of TCP connections initiated by clients and routed to backend servers by a load balancer per second.</p>
</td>
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</table>
</div>
<div class="tablenoborder"><table cellpadding="4" cellspacing="0" summary="" id="elb_pro_01_0004__table17299338192413" frame="border" border="1" rules="all"><caption><b>Table 2 </b><span id="elb_pro_01_0004__ph122521083017">Shared</span> load balancers and their network types</caption><thead align="left"><tr id="elb_pro_01_0004__row229915389243"><th align="left" class="cellrowborder" valign="top" width="25.002500250025%" id="mcps1.3.4.3.2.4.1.1"><p id="elb_pro_01_0004__p1629913812420">Load Balancer Type</p>
<div class="tablenoborder"><table cellpadding="4" cellspacing="0" summary="" id="elb_pro_01_0004__table17299338192413" frame="border" border="1" rules="all"><caption><b>Table 2 </b><span id="elb_pro_01_0004__ph1615913123255">Shared</span> load balancers and their network types</caption><thead align="left"><tr id="elb_pro_01_0004__row229915389243"><th align="left" class="cellrowborder" valign="top" width="25.002500250025%" id="mcps1.3.4.3.2.4.1.1"><p id="elb_pro_01_0004__p1629913812420">Load Balancer Type</p>
</th>
<th align="left" class="cellrowborder" valign="top" width="13.991399139913991%" id="mcps1.3.4.3.2.4.1.2"><p id="elb_pro_01_0004__p5299173872410">Network Type</p>
</th>
@ -41,7 +41,7 @@
</th>
</tr>
</thead>
<tbody><tr id="elb_pro_01_0004__row8299143822415"><td class="cellrowborder" rowspan="2" valign="top" width="25.002500250025%" headers="mcps1.3.4.3.2.4.1.1 "><p id="elb_pro_01_0004__p8299203813247"><span id="elb_pro_01_0004__ph143143917124">Shared</span> load balancers</p>
<tbody><tr id="elb_pro_01_0004__row8299143822415"><td class="cellrowborder" rowspan="2" valign="top" width="25.002500250025%" headers="mcps1.3.4.3.2.4.1.1 "><p id="elb_pro_01_0004__p8299203813247"><span id="elb_pro_01_0004__ph166952765019">Shared</span> load balancers</p>
</td>
<td class="cellrowborder" valign="top" width="13.991399139913991%" headers="mcps1.3.4.3.2.4.1.2 "><p id="elb_pro_01_0004__p18299338102418">Public network</p>
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<h1 class="topictitle1">Overview</h1>
<div id="body1567691173479"><p id="elb_qs_0001__p549023110456">To use ELB to distribute traffic across backend servers, you need to create a dedicated load balancer or <span id="elb_qs_0001__ph158971834164518">a shared</span> load balancer.</p>
<p id="elb_qs_0001__p8060118">Two examples are given to show how you can quickly create <span id="elb_qs_0001__ph1645535710329">a shared</span> load balancer to distribute incoming traffic across backend servers.</p>
<ul id="elb_qs_0001__ul1475054835218"><li id="elb_qs_0001__li9750748135219"><strong id="elb_qs_0001__b6873144712196">Entry level</strong>: An application deployed on separated ECSs needs to handle a large number of requests. Health checks are required to monitor the health of the servers to ensure that incoming traffic is routed only to healthy servers to eliminate SPOFs and improve service availability.<div class="fignone" id="elb_qs_0001__fig742033425910"><span class="figcap"><b>Figure 1 </b>Entry level</span><br><span><img class="vsd" id="elb_qs_0001__image171053318320" src="en-us_image_0000001794660637.png"></span></div>
<p id="elb_qs_0001__p275291135315">As the incoming traffic increases, you can add more <span id="elb_qs_0001__text7468955914">server</span>s to balance the load across backend servers.</p>
<p id="elb_qs_0001__p8060118">Two examples are given to show how you can quickly create <span id="elb_qs_0001__ph10230163051517">a shared</span> load balancer to distribute incoming traffic across backend servers.</p>
<ul id="elb_qs_0001__ul1475054835218"><li id="elb_qs_0001__li9750748135219"><strong id="elb_qs_0001__b756385195519">Entry level</strong>: An application deployed on separated ECSs needs to handle a large number of requests. Health checks are required to monitor the health of the servers to ensure that incoming traffic is routed only to healthy servers to eliminate SPOFs and improve service availability.<div class="fignone" id="elb_qs_0001__fig742033425910"><span class="figcap"><b>Figure 1 </b>Entry level</span><br><span><img class="vsd" id="elb_qs_0001__image171053318320" src="en-us_image_0000001794660637.png"></span></div>
<p id="elb_qs_0001__p275291135315">As the incoming traffic increases, you can add more servers to balance the load across backend servers.</p>
</li><li id="elb_qs_0001__li89701451819"><strong id="elb_qs_0001__b760175818196">Advanced level</strong>: An application deployed on separated servers uses one domain name but different URLs to provide services, and requests are routed to different servers based on the URLs. Forwarding policies are required to forward requests from different URLs to the servers in the corresponding backend server groups.<div class="fignone" id="elb_qs_0001__fig1797419417113"><span class="figcap"><b>Figure 2 </b>Advanced level</span><br><span><img class="vsd" id="elb_qs_0001__image1211651338" src="en-us_image_0000001747380896.png"></span></div>
<p id="elb_qs_0001__p144871825123811">As the incoming traffic increases, you can add more backend servers to the two backend <span id="elb_qs_0001__text124874253385">server</span> groups. You can also configure health checks to monitor the health of backend <span id="elb_qs_0001__text1953021011224">server</span>s to ensure that incoming traffic is routed only to healthy backend <span id="elb_qs_0001__text17647819133720">server</span>s.</p>
<p id="elb_qs_0001__p144871825123811">As the incoming traffic increases, you can add more backend servers to the two backend server groups. You can also configure health checks to monitor the health of backend servers to ensure that incoming traffic is routed only to healthy backend servers.</p>
</li></ul>
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</div>
<div class="section" id="elb_ug_bq_0000__section175469211735"><h4 class="sectiontitle">Adding a Tag to a Listener</h4><p id="elb_ug_bq_0000__p078516156810">You can add tags when you add listeners.</p>
<p id="elb_ug_bq_0000__p1868913231548">To add a tag to an existing listener, perform the following steps:</p>
<ol id="elb_ug_bq_0000__ol18792714101"><li id="elb_ug_bq_0000__li115212495820">Log in to the management console.</li><li id="elb_ug_bq_0000__li15529419589">In the upper left corner of the page, click <span><img id="elb_ug_bq_0000__image129670569320" src="en-us_image_0000001747739624.png"></span> and select the desired region and project.</li><li id="elb_ug_bq_0000__li17301740102218">Click <span><img id="elb_ug_bq_0000__image185212624323028" src="en-us_image_0000001794660485.png"></span> in the upper left corner to display <strong id="elb_ug_bq_0000__b80065074223028">Service List</strong> and choose <strong id="elb_ug_bq_0000__b64618483823028">Network</strong> &gt; <strong id="elb_ug_bq_0000__b139029583023028">Elastic Load Balancing</strong>.</li><li id="elb_ug_bq_0000__li15101427161014">Locate the load balancer and click its name.</li><li id="elb_ug_bq_0000__li8487359151011">Click <strong id="elb_ug_bq_0000__b842352706163816">Listeners</strong>, locate the listener, and click its name.</li><li id="elb_ug_bq_0000__li8155171491312">Under <strong id="elb_ug_bq_0000__b842352706165356">Tags</strong>, click <strong id="elb_ug_bq_0000__b842352706165539">Add Tag</strong>.</li><li id="elb_ug_bq_0000__li16111627151011">In the <strong id="elb_ug_bq_0000__b1379376943">Add Tag</strong> dialog box, enter a tag key and value and click <strong id="elb_ug_bq_0000__b562238371">OK</strong>.<div class="note" id="elb_ug_bq_0000__note12326124181515"><img src="public_sys-resources/note_3.0-en-us.png"><span class="notetitle"> </span><div class="notebody"><ul id="elb_ug_bq_0000__ul332819417158"><li id="elb_ug_bq_0000__li932820411151">A maximum of 20 tags can be added to a listener.</li><li id="elb_ug_bq_0000__li132915415152">Each tag is a key-value pair, and the tag key is unique.</li></ul>
<ol id="elb_ug_bq_0000__ol18792714101"><li id="elb_ug_bq_0000__li115212495820">Log in to the management console.</li><li id="elb_ug_bq_0000__li15529419589">In the upper left corner of the page, click <span><img id="elb_ug_bq_0000__image129670569320" src="en-us_image_0000001747739624.png"></span> and select the desired region and project.</li><li id="elb_ug_bq_0000__li17301740102218">Click <span><img id="elb_ug_bq_0000__image185212624323028" src="en-us_image_0000001794660485.png"></span> in the upper left corner to display <strong id="elb_ug_bq_0000__b80065074223028">Service List</strong> and choose <strong id="elb_ug_bq_0000__b64618483823028">Network</strong> &gt; <strong id="elb_ug_bq_0000__b139029583023028">Elastic Load Balancing</strong>.</li><li id="elb_ug_bq_0000__li15101427161014">Locate the load balancer and click its name.</li><li id="elb_ug_bq_0000__li8487359151011">Click <strong id="elb_ug_bq_0000__b842352706163816">Listeners</strong>, locate the listener, and click its name.</li><li id="elb_ug_bq_0000__li8155171491312">Under <strong id="elb_ug_bq_0000__b842352706165356">Tags</strong>, click <strong id="elb_ug_bq_0000__b842352706165539">Add Tag</strong>.</li><li id="elb_ug_bq_0000__li16111627151011">In the <strong id="elb_ug_bq_0000__b1050468528">Add Tag</strong> dialog box, enter a tag key and value and click <strong id="elb_ug_bq_0000__b299495581">OK</strong>.<div class="note" id="elb_ug_bq_0000__note12326124181515"><img src="public_sys-resources/note_3.0-en-us.png"><span class="notetitle"> </span><div class="notebody"><ul id="elb_ug_bq_0000__ul332819417158"><li id="elb_ug_bq_0000__li932820411151">A maximum of 20 tags can be added to a listener.</li><li id="elb_ug_bq_0000__li132915415152">Each tag is a key-value pair, and the tag key is unique.</li></ul>
</div></div>
</li></ol>
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<a name="elb_ug_fz_0003_01"></a><a name="elb_ug_fz_0003_01"></a>
<h1 class="topictitle1">Network Traffic Paths</h1>
<div id="body8662426"><p id="elb_ug_fz_0003_01__en-us_topic_0166333709_p6741227008">Load balancers communicate with backend <span id="elb_ug_fz_0003_01__en-us_topic_0166333709_text12861016154612">server</span>s over a private network.</p>
<ul id="elb_ug_fz_0003_01__en-us_topic_0166333709_ul1783718431264"><li id="elb_ug_fz_0003_01__en-us_topic_0166333709_li20837643172615">If backend <span id="elb_ug_fz_0003_01__en-us_topic_0166333709_text962105024612">server</span>s process only requests routed from load balancers, there is no need to assign EIPs or create NAT gateways.</li><li id="elb_ug_fz_0003_01__en-us_topic_0166333709_li8561715368">If backend <span id="elb_ug_fz_0003_01__en-us_topic_0166333709_text127813559469">server</span>s need to provide Internet-accessible services or access the Internet, you must assign EIPs or create NAT gateways.</li></ul>
<div id="body8662426"><p id="elb_ug_fz_0003_01__en-us_topic_0166333709_p6741227008">Load balancers communicate with backend servers over a private network.</p>
<ul id="elb_ug_fz_0003_01__en-us_topic_0166333709_ul1783718431264"><li id="elb_ug_fz_0003_01__en-us_topic_0166333709_li20837643172615">If backend servers process only requests routed from load balancers, there is no need to assign EIPs or create NAT gateways.</li><li id="elb_ug_fz_0003_01__en-us_topic_0166333709_li8561715368">If backend servers need to provide Internet-accessible services or access the Internet, you must assign EIPs or create NAT gateways.</li></ul>
<div class="section" id="elb_ug_fz_0003_01__en-us_topic_0166333709_section12884538197"><h4 class="sectiontitle">Inbound Network Traffic Paths</h4><div class="p" id="elb_ug_fz_0003_01__en-us_topic_0166333709_p1730711354418">The listeners' configurations determine how load balancers distribute incoming traffic.<div class="fignone" id="elb_ug_fz_0003_01__en-us_topic_0166333709_fig1920512561518"><span class="figcap"><b>Figure 1 </b>Inbound network traffic</span><br><span><img class="vsd" id="elb_ug_fz_0003_01__en-us_topic_0166333709_image5021893716" src="en-us_image_0000001747739656.png"></span></div>
</div>
<div class="p" id="elb_ug_fz_0003_01__en-us_topic_0166333709_p10196154123714">When a listener uses TCP or UDP to receive incoming traffic:<ul id="elb_ug_fz_0003_01__en-us_topic_0166333709_ul863417283383"><li id="elb_ug_fz_0003_01__en-us_topic_0166333709_li12421739938">Incoming traffic is routed only through the LVS cluster.</li><li id="elb_ug_fz_0003_01__en-us_topic_0166333709_li3634172853812">The LVS cluster directly routes incoming traffic to backend <span id="elb_ug_fz_0003_01__text1363314253911">server</span>s using the load balancing algorithm you select when you add the listener.</li></ul>
<div class="p" id="elb_ug_fz_0003_01__en-us_topic_0166333709_p10196154123714">When a listener uses TCP or UDP to receive incoming traffic:<ul id="elb_ug_fz_0003_01__en-us_topic_0166333709_ul863417283383"><li id="elb_ug_fz_0003_01__en-us_topic_0166333709_li12421739938">Incoming traffic is routed only through the LVS cluster.</li><li id="elb_ug_fz_0003_01__en-us_topic_0166333709_li3634172853812">The LVS cluster directly routes incoming traffic to backend servers using the load balancing algorithm you select when you add the listener.</li></ul>
</div>
<div class="p" id="elb_ug_fz_0003_01__en-us_topic_0166333709_p8342131514383">When a listener uses HTTP or HTTPS to receive incoming traffic:<ul id="elb_ug_fz_0003_01__en-us_topic_0166333709_ul208003244417"><li id="elb_ug_fz_0003_01__en-us_topic_0166333709_li380012244414">Incoming traffic is routed first to the LVS cluster, then to the Nginx cluster, and finally across backend <span id="elb_ug_fz_0003_01__en-us_topic_0166333709_text19960153384810">server</span>s.</li><li id="elb_ug_fz_0003_01__en-us_topic_0166333709_li97801814194412">For HTTPS traffic, the Nginx cluster validates certificates and decrypts data packets before distributing the traffic across backend servers using HTTP.</li></ul>
<div class="p" id="elb_ug_fz_0003_01__en-us_topic_0166333709_p8342131514383">When a listener uses HTTP or HTTPS to receive incoming traffic:<ul id="elb_ug_fz_0003_01__en-us_topic_0166333709_ul208003244417"><li id="elb_ug_fz_0003_01__en-us_topic_0166333709_li380012244414">Incoming traffic is routed first to the LVS cluster, then to the Nginx cluster, and finally across backend servers.</li><li id="elb_ug_fz_0003_01__en-us_topic_0166333709_li97801814194412">For HTTPS traffic, the Nginx cluster validates certificates and decrypts data packets before distributing the traffic across backend servers using HTTP.</li></ul>
</div>
</div>
<div class="section" id="elb_ug_fz_0003_01__en-us_topic_0166333709_section133601141145610"><h4 class="sectiontitle">Outbound Network Traffic Paths</h4><div class="p" id="elb_ug_fz_0003_01__en-us_topic_0166333709_p16360841125618">The outbound traffic is routed back the same way the traffic came in.<div class="fignone" id="elb_ug_fz_0003_01__en-us_topic_0166333709_fig7885192011517"><span class="figcap"><b>Figure 2 </b>Outbound network traffic</span><br><span><img class="vsd" id="elb_ug_fz_0003_01__en-us_topic_0166333709_image1079718394379" src="en-us_image_0000001794819605.png"></span></div>

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<h1 class="topictitle1">Configuring Deletion Protection for Load Balancers</h1>
<div id="body8662426"><div class="section" id="elb_ug_fz_0005__en-us_topic_0000001124473719_section1063251192613"><h4 class="sectiontitle">Scenarios</h4><p id="elb_ug_fz_0005__en-us_topic_0000001124473719_p1071917299262">You can enable deletion protection for load balancers to prevent them from being deleted by accident.</p>
</div>
<div class="section" id="elb_ug_fz_0005__en-us_topic_0000001124473719_section199829311277"><h4 class="sectiontitle">Procedure</h4><ol id="elb_ug_fz_0005__en-us_topic_0000001124473719_ol7973192482819"><li id="elb_ug_fz_0005__en-us_topic_0000001124473719_li677391520332">Log in to the management console.</li><li id="elb_ug_fz_0005__en-us_topic_0000001124473719_li675519100420">In the upper left corner of the page, click <span><img id="elb_ug_fz_0005__en-us_topic_0240829509_image1542118117117" src="en-us_image_0000001747739624.png"></span> and select the desired region and project.</li><li id="elb_ug_fz_0005__li83736197297">Hover on <span><img id="elb_ug_fz_0005__en-us_topic_0167652100_image762510132322" src="en-us_image_0000001794660485.png"></span> in the upper left corner to display <strong id="elb_ug_fz_0005__en-us_topic_0167652100_b9121102522212">Service List</strong> and choose <strong id="elb_ug_fz_0005__en-us_topic_0167652100_b61222025142217">Network</strong> &gt; <strong id="elb_ug_fz_0005__en-us_topic_0167652100_b4124425142210">Elastic Load Balancing</strong>. </li><li id="elb_ug_fz_0005__en-us_topic_0000001124473719_li786163214298">Locate the load balancer and click its name.</li><li id="elb_ug_fz_0005__en-us_topic_0000001124473719_li662115566309">In the <strong id="elb_ug_fz_0005__en-us_topic_0000001124473719_b8917204725112">Summary</strong> tab, enable <strong id="elb_ug_fz_0005__en-us_topic_0000001124473719_b880645835115">Deletion Protection</strong>.</li></ol>
<div class="section" id="elb_ug_fz_0005__en-us_topic_0000001124473719_section199829311277"><h4 class="sectiontitle">Procedure</h4><ol id="elb_ug_fz_0005__en-us_topic_0000001124473719_ol7973192482819"><li id="elb_ug_fz_0005__en-us_topic_0000001124473719_li677391520332">Log in to the management console.</li><li id="elb_ug_fz_0005__en-us_topic_0000001124473719_li675519100420">In the upper left corner of the page, click <span><img id="elb_ug_fz_0005__image199311591368" src="en-us_image_0000001747739624.png"></span> and select the desired region and project.</li><li id="elb_ug_fz_0005__li83736197297">Click <span><img id="elb_ug_fz_0005__image8482041377" src="en-us_image_0000001794660485.png"></span> in the upper left corner to display <strong id="elb_ug_fz_0005__b1848212413718">Service List</strong> and choose <strong id="elb_ug_fz_0005__b5482546711">Network</strong> &gt; <strong id="elb_ug_fz_0005__b194821641878">Elastic Load Balancing</strong>.</li><li id="elb_ug_fz_0005__en-us_topic_0000001124473719_li786163214298">Locate the load balancer and click its name.</li><li id="elb_ug_fz_0005__en-us_topic_0000001124473719_li662115566309">In the <strong id="elb_ug_fz_0005__en-us_topic_0000001124473719_b8917204725112">Summary</strong> tab, enable <strong id="elb_ug_fz_0005__en-us_topic_0000001124473719_b880645835115">Deletion Protection</strong>.</li></ol>
<div class="note" id="elb_ug_fz_0005__en-us_topic_0000001124473719_note8738203063713"><img src="public_sys-resources/note_3.0-en-us.png"><span class="notetitle"> </span><div class="notebody"><p id="elb_ug_fz_0005__en-us_topic_0000001124473719_p2738143013716">Disable deletion protection before you delete a load balancer.</p>
</div></div>
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<div class="section" id="elb_ug_hd_0002__en-us_topic_0000001434422737_section1261104918577"><a name="elb_ug_hd_0002__en-us_topic_0000001434422737_section1261104918577"></a><a name="en-us_topic_0000001434422737_section1261104918577"></a><h4 class="sectiontitle">Configuring <span id="elb_ug_hd_0002__en-us_topic_0000001434422737_ph3292026172912">Firewall</span> Rules</h4><p id="elb_ug_hd_0002__en-us_topic_0000001434422737_p3997193819710">To control traffic in and out of a subnet, you can associate a firewall with the subnet. <span id="elb_ug_hd_0002__ph1148121435410">Firewall</span> rules control access to subnets and add an additional layer of defense to your subnets. Default <span id="elb_ug_hd_0002__en-us_topic_0000001434422737_ph2099543163415">firewall</span> rules reject all inbound and outbound traffic. If the subnet of a load balancer or associated backend servers has a <span id="elb_ug_hd_0002__ph7160208101419">firewall</span> associated, the load balancer cannot receive traffic from the Internet or route traffic to backend servers, and backend servers cannot receive traffic from and respond to the load balancer.</p>
<p id="elb_ug_hd_0002__en-us_topic_0000001434422737_p79433211595">You can configure an inbound <span id="elb_ug_hd_0002__ph9906154113149">firewall</span> rule to permit access from 100.125.0.0/16.</p>
<p id="elb_ug_hd_0002__en-us_topic_0000001434422737_p188635318526">ELB translates the public IP addresses used to access backend servers into private IP addresses in 100.125.0.0/16<span id="elb_ug_hd_0002__en-us_topic_0000001434422737_ph234533164319"></span>. You cannot configure <span id="elb_ug_hd_0002__en-us_topic_0000001434422737_ph659533333419">firewall</span> rules to prevent public IP addresses from accessing backend servers.</p>
<ol id="elb_ug_hd_0002__en-us_topic_0000001434422737_ol17965143881417"><li id="elb_ug_hd_0002__en-us_topic_0000001434422737_li20860192818532">Log in to the management console.</li><li id="elb_ug_hd_0002__en-us_topic_0000001434422737_li1486022812537">In the upper left corner of the page, click <span><img id="elb_ug_hd_0002__image1513838243" src="en-us_image_0000001747739624.png"></span> and select the desired region and project.</li><li id="elb_ug_hd_0002__en-us_topic_0000001434422737_l2446029456ed45d08632be6e309b1c82">Click <span><img id="elb_ug_hd_0002__image1150516171343" src="en-us_image_0000001747381344.png"></span> in the upper left corner to display <strong id="elb_ug_hd_0002__b550681716347">Service List</strong> and choose <strong id="elb_ug_hd_0002__b95083178346">Network</strong> &gt; <strong id="elb_ug_hd_0002__b251112178347">Virtual Private Cloud</strong>.</li><li id="elb_ug_hd_0002__en-us_topic_0000001434422737_li47160469161557">In the navigation pane on the left, choose <strong id="elb_ug_hd_0002__b723511435514">Access Control</strong> &gt; <span id="elb_ug_hd_0002__ph152371741551"><strong id="elb_ug_hd_0002__b02362465514">Firewalls</strong></span>.</li><li id="elb_ug_hd_0002__en-us_topic_0000001434422737_li30045754154757">In the <span id="elb_ug_hd_0002__ph139491915555">firewall</span> list, click the name of the <span id="elb_ug_hd_0002__ph149503915511">firewall</span> to switch to the page showing its details.</li><li id="elb_ug_hd_0002__en-us_topic_0000001434422737_li1976338154757">On the <strong id="elb_ug_hd_0002__b123377751644720">Inbound Rules</strong> or <strong id="elb_ug_hd_0002__b92780486944720">Outbound Rules</strong> tab page, click <strong id="elb_ug_hd_0002__b167353681644720">Add Rule</strong> to add an inbound or outbound rule.<ul id="elb_ug_hd_0002__en-us_topic_0000001434422737_ul185172012178"><li id="elb_ug_hd_0002__li65566217013"><strong id="elb_ug_hd_0002__b5607731672177">Type</strong>: Select the IP address type supported by the rule. The value can be <strong id="elb_ug_hd_0002__b4824630532177">IPv4</strong> or <strong id="elb_ug_hd_0002__b12405294392177">IPv6</strong>.</li><li id="elb_ug_hd_0002__en-us_topic_0000001434422737_li4511820191719"><strong id="elb_ug_hd_0002__b170208327844720">Action</strong>: Select <strong id="elb_ug_hd_0002__b98908438544720">Allow</strong>.</li><li id="elb_ug_hd_0002__en-us_topic_0000001434422737_li8626942141716"><strong id="elb_ug_hd_0002__b13785153453">Protocol</strong>: The protocol must be the same as the backend protocol.</li><li id="elb_ug_hd_0002__en-us_topic_0000001434422737_li9500202313188"><strong id="elb_ug_hd_0002__b69347681714">Source</strong>: Set it to 100.125.0.0/16<span id="elb_ug_hd_0002__en-us_topic_0000001434422737_ph48650374431"></span>.</li><li id="elb_ug_hd_0002__en-us_topic_0000001434422737_li66251610162417"><strong id="elb_ug_hd_0002__b88956921512">Source Port Range</strong>: Select a port range based on the service requirements.</li><li id="elb_ug_hd_0002__en-us_topic_0000001434422737_li7464162916350"><strong id="elb_ug_hd_0002__b197450049944720">Destination</strong>: Enter a destination address allowed in this direction. The default value is <strong id="elb_ug_hd_0002__b90215941444720">0.0.0.0/0</strong>, which indicates that traffic from all IP addresses is permitted.</li><li id="elb_ug_hd_0002__en-us_topic_0000001434422737_li5915133319341"><strong id="elb_ug_hd_0002__b522151521515">Destination Port Range</strong>: Select a port range based on the service requirements.</li><li id="elb_ug_hd_0002__en-us_topic_0000001434422737_li75457153520">(Optional) <strong id="elb_ug_hd_0002__b8611191512558">Description</strong>: Describe the firewall rule if necessary.</li></ul>
<ol id="elb_ug_hd_0002__en-us_topic_0000001434422737_ol17965143881417"><li id="elb_ug_hd_0002__en-us_topic_0000001434422737_li20860192818532">Log in to the management console.</li><li id="elb_ug_hd_0002__en-us_topic_0000001434422737_li1486022812537">In the upper left corner of the page, click <span><img id="elb_ug_hd_0002__image103007096" src="en-us_image_0000001747739624.png"></span> and select the desired region and project.</li><li id="elb_ug_hd_0002__en-us_topic_0000001434422737_l2446029456ed45d08632be6e309b1c82">Click <span><img id="elb_ug_hd_0002__image1150516171343" src="en-us_image_0000001747381344.png"></span> in the upper left corner to display <strong id="elb_ug_hd_0002__b550681716347">Service List</strong> and choose <strong id="elb_ug_hd_0002__b95083178346">Network</strong> &gt; <strong id="elb_ug_hd_0002__b251112178347">Virtual Private Cloud</strong>.</li><li id="elb_ug_hd_0002__en-us_topic_0000001434422737_li47160469161557">In the navigation pane on the left, choose <strong id="elb_ug_hd_0002__b723511435514">Access Control</strong> &gt; <span id="elb_ug_hd_0002__ph152371741551"><strong id="elb_ug_hd_0002__b02362465514">Firewalls</strong></span>.</li><li id="elb_ug_hd_0002__en-us_topic_0000001434422737_li30045754154757">In the <span id="elb_ug_hd_0002__ph139491915555">firewall</span> list, click the name of the <span id="elb_ug_hd_0002__ph149503915511">firewall</span> to switch to the page showing its details.</li><li id="elb_ug_hd_0002__en-us_topic_0000001434422737_li1976338154757">On the <strong id="elb_ug_hd_0002__b123377751644720">Inbound Rules</strong> or <strong id="elb_ug_hd_0002__b92780486944720">Outbound Rules</strong> tab page, click <strong id="elb_ug_hd_0002__b167353681644720">Add Rule</strong> to add an inbound or outbound rule.<ul id="elb_ug_hd_0002__en-us_topic_0000001434422737_ul185172012178"><li id="elb_ug_hd_0002__li65566217013"><strong id="elb_ug_hd_0002__b5607731672177">Type</strong>: Select the IP address type supported by the rule. The value can be <strong id="elb_ug_hd_0002__b4824630532177">IPv4</strong> or <strong id="elb_ug_hd_0002__b12405294392177">IPv6</strong>.</li><li id="elb_ug_hd_0002__en-us_topic_0000001434422737_li4511820191719"><strong id="elb_ug_hd_0002__b170208327844720">Action</strong>: Select <strong id="elb_ug_hd_0002__b98908438544720">Allow</strong>.</li><li id="elb_ug_hd_0002__en-us_topic_0000001434422737_li8626942141716"><strong id="elb_ug_hd_0002__b13785153453">Protocol</strong>: The protocol must be the same as the backend protocol.</li><li id="elb_ug_hd_0002__en-us_topic_0000001434422737_li9500202313188"><strong id="elb_ug_hd_0002__b69347681714">Source</strong>: Set it to 100.125.0.0/16<span id="elb_ug_hd_0002__en-us_topic_0000001434422737_ph48650374431"></span>.</li><li id="elb_ug_hd_0002__en-us_topic_0000001434422737_li66251610162417"><strong id="elb_ug_hd_0002__b88956921512">Source Port Range</strong>: Select a port range based on the service requirements.</li><li id="elb_ug_hd_0002__en-us_topic_0000001434422737_li7464162916350"><strong id="elb_ug_hd_0002__b197450049944720">Destination</strong>: Enter a destination address allowed in this direction. The default value is <strong id="elb_ug_hd_0002__b90215941444720">0.0.0.0/0</strong>, which indicates that traffic from all IP addresses is permitted.</li><li id="elb_ug_hd_0002__en-us_topic_0000001434422737_li5915133319341"><strong id="elb_ug_hd_0002__b522151521515">Destination Port Range</strong>: Select a port range based on the service requirements.</li><li id="elb_ug_hd_0002__en-us_topic_0000001434422737_li75457153520">(Optional) <strong id="elb_ug_hd_0002__b8611191512558">Description</strong>: Describe the firewall rule if necessary.</li></ul>
</li><li id="elb_ug_hd_0002__en-us_topic_0000001434422737_li162953310168">Click <strong id="elb_ug_hd_0002__b40977673344720">OK</strong>.</li></ol>
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</div>
<div class="section" id="elb_ug_ip_0000__section1589592111573"><h4 class="sectiontitle">Constraints</h4><ul id="elb_ug_ip_0000__ul11569513354"><li id="elb_ug_ip_0000__li1324601515520">By default, you can create a maximum of 50 IP address groups.</li><li id="elb_ug_ip_0000__li15695131453">An IP address group can be associated with a maximum of 50 listeners.</li></ul>
</div>
<div class="section" id="elb_ug_ip_0000__section1163718452455"><h4 class="sectiontitle">Procedure</h4><ol id="elb_ug_ip_0000__ol11229133665417"><li id="elb_ug_ip_0000__li677391520332">Log in to the management console.</li><li id="elb_ug_ip_0000__li675519100420">In the upper left corner of the page, click <span><img id="elb_ug_ip_0000__en-us_topic_0240829509_image1542118117117" src="en-us_image_0000001747739624.png"></span> and select the desired region and project.</li><li id="elb_ug_ip_0000__li83736197297">Hover on <span><img id="elb_ug_ip_0000__en-us_topic_0167652100_image762510132322" src="en-us_image_0000001794660485.png"></span> in the upper left corner to display <strong id="elb_ug_ip_0000__en-us_topic_0167652100_b9121102522212">Service List</strong> and choose <strong id="elb_ug_ip_0000__en-us_topic_0167652100_b61222025142217">Network</strong> &gt; <strong id="elb_ug_ip_0000__en-us_topic_0167652100_b4124425142210">Elastic Load Balancing</strong>. </li><li id="elb_ug_ip_0000__li2068275214164">In the navigation pane on the left, choose <strong id="elb_ug_ip_0000__b190271782574247">Elastic Load Balance</strong> &gt; <strong id="elb_ug_ip_0000__b116915530974247">IP Address Groups</strong>.</li><li id="elb_ug_ip_0000__li46548454119">On the displayed page, click <strong id="elb_ug_ip_0000__b20956724674247">Create IP Address Group</strong>.</li><li id="elb_ug_ip_0000__li3525459183317">Configure the parameters based on <a href="#elb_ug_ip_0000__table3263104318541">Table 1</a>.
<div class="section" id="elb_ug_ip_0000__section1163718452455"><h4 class="sectiontitle">Procedure</h4><ol id="elb_ug_ip_0000__ol11229133665417"><li id="elb_ug_ip_0000__li677391520332">Log in to the management console.</li><li id="elb_ug_ip_0000__li675519100420">In the upper left corner of the page, click <span><img id="elb_ug_ip_0000__image147873599811730" src="en-us_image_0000001747739624.png"></span> and select the desired region and project.</li><li id="elb_ug_ip_0000__li83736197297">Click <span><img id="elb_ug_ip_0000__image166907778011725" src="en-us_image_0000001794660485.png"></span> in the upper left corner to display <strong id="elb_ug_ip_0000__b38089412411725">Service List</strong> and choose <strong id="elb_ug_ip_0000__b50078033111725">Network</strong> &gt; <strong id="elb_ug_ip_0000__b171245662911725">Elastic Load Balancing</strong>.</li><li id="elb_ug_ip_0000__li2068275214164">In the navigation pane on the left, choose <strong id="elb_ug_ip_0000__b190271782574247">Elastic Load Balance</strong> &gt; <strong id="elb_ug_ip_0000__b116915530974247">IP Address Groups</strong>.</li><li id="elb_ug_ip_0000__li46548454119">On the displayed page, click <strong id="elb_ug_ip_0000__b20956724674247">Create IP Address Group</strong>.</li><li id="elb_ug_ip_0000__li3525459183317">Configure the parameters based on <a href="#elb_ug_ip_0000__table3263104318541">Table 1</a>.
<div class="tablenoborder"><a name="elb_ug_ip_0000__table3263104318541"></a><a name="table3263104318541"></a><table cellpadding="4" cellspacing="0" summary="" id="elb_ug_ip_0000__table3263104318541" frame="border" border="1" rules="all"><caption><b>Table 1 </b>Parameters required for creating an IP address group</caption><thead align="left"><tr id="elb_ug_ip_0000__row6556870018541"><th align="left" class="cellrowborder" valign="top" width="18.23182318231823%" id="mcps1.3.3.2.6.2.2.4.1.1"><p id="elb_ug_ip_0000__p60775331862">Parameter</p>
</th>
<th align="left" class="cellrowborder" valign="top" width="48.434843484348434%" id="mcps1.3.3.2.6.2.2.4.1.2"><p id="elb_ug_ip_0000__p5449227018541">Description</p>

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@ -7,17 +7,17 @@
<ul id="elb_ug_ip_0002__ul11918407545"><li id="elb_ug_ip_0002__li391440125416">Each IP address or CIDR block must be on a separate line and end with a carriage return.</li><li id="elb_ug_ip_0002__li199112402545">Each IP address or CIDR block can include a description with a vertical bar (|) separated, for example, 192.168.10.10 | ECS01. The description is 0 to 255 characters long and cannot contain angle brackets (&lt;&gt;).</li><li id="elb_ug_ip_0002__li191154075413">You can add a maximum of 300 IP addresses and CIDR blocks in each IP address group.</li></ul>
</div>
<div class="section" id="elb_ug_ip_0002__section1870011618404"><a name="elb_ug_ip_0002__section1870011618404"></a><a name="section1870011618404"></a><h4 class="sectiontitle">Adding IP Addresses</h4><p id="elb_ug_ip_0002__p2484161283">After an IP address group is created, you can add IP addresses to an IP address group.</p>
<ol id="elb_ug_ip_0002__ol11229133665417"><li id="elb_ug_ip_0002__li677391520332">Log in to the management console.</li><li id="elb_ug_ip_0002__li675519100420">In the upper left corner of the page, click <span><img id="elb_ug_ip_0002__en-us_topic_0240829509_image1542118117117" src="en-us_image_0000001747739624.png"></span> and select the desired region and project.</li><li id="elb_ug_ip_0002__li83736197297">Hover on <span><img id="elb_ug_ip_0002__en-us_topic_0167652100_image762510132322" src="en-us_image_0000001794660485.png"></span> in the upper left corner to display <strong id="elb_ug_ip_0002__en-us_topic_0167652100_b9121102522212">Service List</strong> and choose <strong id="elb_ug_ip_0002__en-us_topic_0167652100_b61222025142217">Network</strong> &gt; <strong id="elb_ug_ip_0002__en-us_topic_0167652100_b4124425142210">Elastic Load Balancing</strong>. </li><li id="elb_ug_ip_0002__li2068275214164">In the navigation pane on the left, choose <strong id="elb_ug_ip_0002__b120058745975631">Elastic Load Balance</strong> &gt; <strong id="elb_ug_ip_0002__b107250680975631">IP Address Groups</strong>.</li><li id="elb_ug_ip_0002__li39326442032">On the <strong id="elb_ug_ip_0002__b3541103610511">IP Address Groups</strong> page, click the name of the target address group.</li><li id="elb_ug_ip_0002__li780362216348">In the lower part of the displayed page, choose <strong id="elb_ug_ip_0002__b123268126720">IP Addresses</strong> tab and click <strong id="elb_ug_ip_0002__b853918481777">Add IP Addresses</strong>.</li><li id="elb_ug_ip_0002__li458011511377">On the <strong id="elb_ug_ip_0002__b1456204014914">Add IP Addresses</strong> page, add IP addresses.</li><li id="elb_ug_ip_0002__li3993193834116">Click <strong id="elb_ug_ip_0002__b84235270610535_3">OK</strong>.</li></ol>
<ol id="elb_ug_ip_0002__ol11229133665417"><li id="elb_ug_ip_0002__li677391520332">Log in to the management console.</li><li id="elb_ug_ip_0002__li675519100420">In the upper left corner of the page, click <span><img id="elb_ug_ip_0002__image35667653411731" src="en-us_image_0000001747739624.png"></span> and select the desired region and project.</li><li id="elb_ug_ip_0002__li83736197297">Click <span><img id="elb_ug_ip_0002__image207804660211726" src="en-us_image_0000001794660485.png"></span> in the upper left corner to display <strong id="elb_ug_ip_0002__b857967711726">Service List</strong> and choose <strong id="elb_ug_ip_0002__b160640816511726">Network</strong> &gt; <strong id="elb_ug_ip_0002__b64106472111726">Elastic Load Balancing</strong>.</li><li id="elb_ug_ip_0002__li2068275214164">In the navigation pane on the left, choose <strong id="elb_ug_ip_0002__b120058745975631">Elastic Load Balance</strong> &gt; <strong id="elb_ug_ip_0002__b107250680975631">IP Address Groups</strong>.</li><li id="elb_ug_ip_0002__li39326442032">On the <strong id="elb_ug_ip_0002__b3541103610511">IP Address Groups</strong> page, click the name of the target address group.</li><li id="elb_ug_ip_0002__li780362216348">In the lower part of the displayed page, choose <strong id="elb_ug_ip_0002__b123268126720">IP Addresses</strong> tab and click <strong id="elb_ug_ip_0002__b853918481777">Add IP Addresses</strong>.</li><li id="elb_ug_ip_0002__li458011511377">On the <strong id="elb_ug_ip_0002__b1456204014914">Add IP Addresses</strong> page, add IP addresses.</li><li id="elb_ug_ip_0002__li3993193834116">Click <strong id="elb_ug_ip_0002__b84235270610535_3">OK</strong>.</li></ol>
</div>
<div class="section" id="elb_ug_ip_0002__section242243784118"><a name="elb_ug_ip_0002__section242243784118"></a><a name="section242243784118"></a><h4 class="sectiontitle">Changing IP Addresses</h4><p id="elb_ug_ip_0002__p91141432419">You can perform the following steps to change all IP addresses in an IP address group:</p>
<ol id="elb_ug_ip_0002__ol10724137603"><li id="elb_ug_ip_0002__li19724273019">Log in to the management console.</li><li id="elb_ug_ip_0002__li1972415715019">In the upper left corner of the page, click <span><img id="elb_ug_ip_0002__en-us_topic_0240829509_image1542118117117_1" src="en-us_image_0000001747739624.png"></span> and select the desired region and project.</li><li id="elb_ug_ip_0002__li2072497707">Hover on <span><img id="elb_ug_ip_0002__en-us_topic_0167652100_image762510132322_1" src="en-us_image_0000001794660485.png"></span> in the upper left corner to display <strong id="elb_ug_ip_0002__en-us_topic_0167652100_b9121102522212_1">Service List</strong> and choose <strong id="elb_ug_ip_0002__en-us_topic_0167652100_b61222025142217_1">Network</strong> &gt; <strong id="elb_ug_ip_0002__en-us_topic_0167652100_b4124425142210_1">Elastic Load Balancing</strong>. </li><li id="elb_ug_ip_0002__li14446163102718">In the navigation pane on the left, choose <strong id="elb_ug_ip_0002__b5587681275631">Elastic Load Balance</strong> &gt; <strong id="elb_ug_ip_0002__b10652830775631">IP Address Groups</strong>.</li><li id="elb_ug_ip_0002__li106231251304">On the <strong id="elb_ug_ip_0002__b7137850161114">IP Address Groups</strong> page, you can:<ol type="a" id="elb_ug_ip_0002__ol12325123731520"><li id="elb_ug_ip_0002__li3437183421520">Modify the basic information and change IP addresses of an IP address group:<ol class="substepthirdol" id="elb_ug_ip_0002__ol10735941131611"><li id="elb_ug_ip_0002__li5735441131619">Locate the target address group, click <strong id="elb_ug_ip_0002__b14643645111418">Modify</strong> in the <strong id="elb_ug_ip_0002__b1006481148">Operation</strong> column.</li><li id="elb_ug_ip_0002__li2823540340">You can modify the name and description of an IP address group, and change all its IP addresses.</li><li id="elb_ug_ip_0002__li17295163852018">Click <strong id="elb_ug_ip_0002__b100656046275631">OK</strong>.</li></ol>
<ol id="elb_ug_ip_0002__ol10724137603"><li id="elb_ug_ip_0002__li19724273019">Log in to the management console.</li><li id="elb_ug_ip_0002__li1972415715019">In the upper left corner of the page, click <span><img id="elb_ug_ip_0002__image191981949211731" src="en-us_image_0000001747739624.png"></span> and select the desired region and project.</li><li id="elb_ug_ip_0002__li2072497707">Click <span><img id="elb_ug_ip_0002__image207873008411726" src="en-us_image_0000001794660485.png"></span> in the upper left corner to display <strong id="elb_ug_ip_0002__b31229833311726">Service List</strong> and choose <strong id="elb_ug_ip_0002__b21129912811726">Network</strong> &gt; <strong id="elb_ug_ip_0002__b137149218311726">Elastic Load Balancing</strong>.</li><li id="elb_ug_ip_0002__li14446163102718">In the navigation pane on the left, choose <strong id="elb_ug_ip_0002__b5587681275631">Elastic Load Balance</strong> &gt; <strong id="elb_ug_ip_0002__b10652830775631">IP Address Groups</strong>.</li><li id="elb_ug_ip_0002__li106231251304">On the <strong id="elb_ug_ip_0002__b7137850161114">IP Address Groups</strong> page, you can:<ol type="a" id="elb_ug_ip_0002__ol12325123731520"><li id="elb_ug_ip_0002__li3437183421520">Modify the basic information and change IP addresses of an IP address group:<ol class="substepthirdol" id="elb_ug_ip_0002__ol10735941131611"><li id="elb_ug_ip_0002__li5735441131619">Locate the target address group, click <strong id="elb_ug_ip_0002__b14643645111418">Modify</strong> in the <strong id="elb_ug_ip_0002__b1006481148">Operation</strong> column.</li><li id="elb_ug_ip_0002__li2823540340">You can modify the name and description of an IP address group, and change all its IP addresses.</li><li id="elb_ug_ip_0002__li17295163852018">Click <strong id="elb_ug_ip_0002__b100656046275631">OK</strong>.</li></ol>
</li><li id="elb_ug_ip_0002__li195521211202112">Only change IP addresses:<ol class="substepthirdol" id="elb_ug_ip_0002__ol4256162813217"><li id="elb_ug_ip_0002__li1896416350213">Click the name of the target IP address group.</li><li id="elb_ug_ip_0002__li1521226142116">In the lower part of the displayed page, choose <strong id="elb_ug_ip_0002__b16361781717">IP Addresses</strong> tab and click <strong id="elb_ug_ip_0002__b43191721713">Change IP Address</strong>.</li><li id="elb_ug_ip_0002__li2017072132210">Change IP addresses as you needed.</li><li id="elb_ug_ip_0002__li324782932214">Click <strong id="elb_ug_ip_0002__b5609038275631">OK</strong>.</li></ol>
</li></ol>
</li></ol>
</div>
<div class="section" id="elb_ug_ip_0002__section14993123018571"><a name="elb_ug_ip_0002__section14993123018571"></a><a name="section14993123018571"></a><h4 class="sectiontitle">Deleting an IP Address</h4><p id="elb_ug_ip_0002__p81561041182617">If you want to delete IP addresses in batches from an IP address group, see <a href="#elb_ug_ip_0002__section242243784118">Changing IP Addresses</a>.</p>
<p id="elb_ug_ip_0002__p425312318258">To delete an IP address from an IP address group, perform the following operations:</p>
<ol id="elb_ug_ip_0002__ol108281332132615"><li id="elb_ug_ip_0002__li482873213268">Log in to the management console.</li><li id="elb_ug_ip_0002__li13828132152614">In the upper left corner of the page, click <span><img id="elb_ug_ip_0002__en-us_topic_0240829509_image1542118117117_2" src="en-us_image_0000001747739624.png"></span> and select the desired region and project.</li><li id="elb_ug_ip_0002__li15829432112617">Hover on <span><img id="elb_ug_ip_0002__en-us_topic_0167652100_image762510132322_2" src="en-us_image_0000001794660485.png"></span> in the upper left corner to display <strong id="elb_ug_ip_0002__en-us_topic_0167652100_b9121102522212_2">Service List</strong> and choose <strong id="elb_ug_ip_0002__en-us_topic_0167652100_b61222025142217_2">Network</strong> &gt; <strong id="elb_ug_ip_0002__en-us_topic_0167652100_b4124425142210_2">Elastic Load Balancing</strong>. </li><li id="elb_ug_ip_0002__li1283812512820">In the navigation pane on the left, choose <strong id="elb_ug_ip_0002__b56377214775631">Elastic Load Balance</strong> &gt; <strong id="elb_ug_ip_0002__b152096725275631">IP Address Groups</strong>.</li><li id="elb_ug_ip_0002__li108741114122819">On the <strong id="elb_ug_ip_0002__b159671921182216">IP Address Groups</strong> page, click the name of the target address group.</li><li id="elb_ug_ip_0002__li17818202417280">In the IP address list, locate the IP address you want to delete and click <strong id="elb_ug_ip_0002__b342261018235">Delete</strong> in the <strong id="elb_ug_ip_0002__b1342251072315">Operation</strong> column.<p id="elb_ug_ip_0002__p173531629193020">A confirmation dialog box is displayed.</p>
<ol id="elb_ug_ip_0002__ol108281332132615"><li id="elb_ug_ip_0002__li482873213268">Log in to the management console.</li><li id="elb_ug_ip_0002__li13828132152614">In the upper left corner of the page, click <span><img id="elb_ug_ip_0002__image91024864111731" src="en-us_image_0000001747739624.png"></span> and select the desired region and project.</li><li id="elb_ug_ip_0002__li15829432112617">Click <span><img id="elb_ug_ip_0002__image128198984711726" src="en-us_image_0000001794660485.png"></span> in the upper left corner to display <strong id="elb_ug_ip_0002__b120060040411726">Service List</strong> and choose <strong id="elb_ug_ip_0002__b83017803711726">Network</strong> &gt; <strong id="elb_ug_ip_0002__b128089818611726">Elastic Load Balancing</strong>.</li><li id="elb_ug_ip_0002__li1283812512820">In the navigation pane on the left, choose <strong id="elb_ug_ip_0002__b56377214775631">Elastic Load Balance</strong> &gt; <strong id="elb_ug_ip_0002__b152096725275631">IP Address Groups</strong>.</li><li id="elb_ug_ip_0002__li108741114122819">On the <strong id="elb_ug_ip_0002__b159671921182216">IP Address Groups</strong> page, click the name of the target address group.</li><li id="elb_ug_ip_0002__li17818202417280">In the IP address list, locate the IP address you want to delete and click <strong id="elb_ug_ip_0002__b342261018235">Delete</strong> in the <strong id="elb_ug_ip_0002__b1342251072315">Operation</strong> column.<p id="elb_ug_ip_0002__p173531629193020">A confirmation dialog box is displayed.</p>
</li><li id="elb_ug_ip_0002__li24505221310">Confirm the information and click <strong id="elb_ug_ip_0002__b205137459875631">Yes</strong>.</li></ol>
</div>
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</div>
<div class="section" id="elb_ug_ip_0004__section680227103312"><h4 class="sectiontitle">Constraints</h4><p id="elb_ug_ip_0004__p336312488342">An IP address group that has been used for controlling access to a listener cannot be deleted. You can view the listeners associated with an IP address group by referring to <a href="elb_ug_ip_0003.html">Viewing the Details of an IP Address Group</a>. For details about how to disassociate an IP address group from a listener, see <a href="elb_03_0003.html#elb_03_0003__section109371640175915">Configuring Access Control</a>.</p>
</div>
<div class="section" id="elb_ug_ip_0004__section1779133983815"><h4 class="sectiontitle">Procedure</h4><ol id="elb_ug_ip_0004__ol16986135153815"><li id="elb_ug_ip_0004__li18986251163816">Log in to the management console.</li><li id="elb_ug_ip_0004__li13986135163812">In the upper left corner of the page, click <span><img id="elb_ug_ip_0004__en-us_topic_0240829509_image1542118117117" src="en-us_image_0000001747739624.png"></span> and select the desired region and project.</li><li id="elb_ug_ip_0004__li189860519384">Hover on <span><img id="elb_ug_ip_0004__en-us_topic_0167652100_image762510132322" src="en-us_image_0000001794660485.png"></span> in the upper left corner to display <strong id="elb_ug_ip_0004__en-us_topic_0167652100_b9121102522212">Service List</strong> and choose <strong id="elb_ug_ip_0004__en-us_topic_0167652100_b61222025142217">Network</strong> &gt; <strong id="elb_ug_ip_0004__en-us_topic_0167652100_b4124425142210">Elastic Load Balancing</strong>. </li><li id="elb_ug_ip_0004__li2068275214164">In the navigation pane on the left, choose <strong id="elb_ug_ip_0004__b141923291075635">Elastic Load Balance</strong> &gt; <strong id="elb_ug_ip_0004__b211072773075635">IP Address Groups</strong>.</li><li id="elb_ug_ip_0004__li1998619516383">On the <strong id="elb_ug_ip_0004__b157848819275635">IP Address Groups</strong> page, locate the IP address group, and click <strong id="elb_ug_ip_0004__b92977246375635">Delete</strong> in the <strong id="elb_ug_ip_0004__b28297033275635">Operation</strong> column.</li><li id="elb_ug_ip_0004__li1986251163811">Click <strong id="elb_ug_ip_0004__b115092332075635">Yes</strong>.</li></ol>
<div class="section" id="elb_ug_ip_0004__section1779133983815"><h4 class="sectiontitle">Procedure</h4><ol id="elb_ug_ip_0004__ol16986135153815"><li id="elb_ug_ip_0004__li18986251163816">Log in to the management console.</li><li id="elb_ug_ip_0004__li13986135163812">In the upper left corner of the page, click <span><img id="elb_ug_ip_0004__image95637016611732" src="en-us_image_0000001747739624.png"></span> and select the desired region and project.</li><li id="elb_ug_ip_0004__li189860519384">Click <span><img id="elb_ug_ip_0004__image54670449311833" src="en-us_image_0000001794660485.png"></span> in the upper left corner to display <strong id="elb_ug_ip_0004__b197896476811833">Service List</strong> and choose <strong id="elb_ug_ip_0004__b168177499111833">Network</strong> &gt; <strong id="elb_ug_ip_0004__b29222203211833">Elastic Load Balancing</strong>.</li><li id="elb_ug_ip_0004__li2068275214164">In the navigation pane on the left, choose <strong id="elb_ug_ip_0004__b141923291075635">Elastic Load Balance</strong> &gt; <strong id="elb_ug_ip_0004__b211072773075635">IP Address Groups</strong>.</li><li id="elb_ug_ip_0004__li1998619516383">On the <strong id="elb_ug_ip_0004__b157848819275635">IP Address Groups</strong> page, locate the IP address group, and click <strong id="elb_ug_ip_0004__b92977246375635">Delete</strong> in the <strong id="elb_ug_ip_0004__b28297033275635">Operation</strong> column.</li><li id="elb_ug_ip_0004__li1986251163811">Click <strong id="elb_ug_ip_0004__b115092332075635">Yes</strong>.</li></ol>
</div>
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@ -8,7 +8,12 @@
</th>
</tr>
</thead>
<tbody><tr id="elb_ug_jl_0000__row84124411115"><td class="cellrowborder" valign="top" width="28.599999999999998%" headers="mcps1.3.1.1.3.1.1 "><p id="elb_ug_jl_0000__p14412442118">2024-09-26</p>
<tbody><tr id="elb_ug_jl_0000__row15206195901019"><td class="cellrowborder" valign="top" width="28.599999999999998%" headers="mcps1.3.1.1.3.1.1 "><p id="elb_ug_jl_0000__p162077592109">2025-04-08</p>
</td>
<td class="cellrowborder" valign="top" width="71.39999999999999%" headers="mcps1.3.1.1.3.1.2 "><p id="elb_ug_jl_0000__p6207259191019">Added the description that all AZs are selected by default for dedicated load balancers.</p>
</td>
</tr>
<tr id="elb_ug_jl_0000__row84124411115"><td class="cellrowborder" valign="top" width="28.599999999999998%" headers="mcps1.3.1.1.3.1.1 "><p id="elb_ug_jl_0000__p14412442118">2024-09-26</p>
</td>
<td class="cellrowborder" valign="top" width="71.39999999999999%" headers="mcps1.3.1.1.3.1.2 "><p id="elb_ug_jl_0000__p16118102712115">Introduced elastic specifications for dedicated load balancers.</p>
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@ -27,9 +27,9 @@
</div>
<div class="section" id="elb_ug_jt_0002__section4613345111719"><h4 class="sectiontitle">Backend Protocols and Ports</h4><p id="elb_ug_jt_0002__p035410353276">Backend protocols and ports are used by backend servers to receive requests from load balancers. If Windows servers have Internet Information Services (IIS) installed, the default backend protocol and port are HTTP and 80.</p>
<div class="tablenoborder"><table cellpadding="4" cellspacing="0" summary="" id="elb_ug_jt_0002__table193210457467" frame="border" border="1" rules="all"><caption><b>Table 2 </b>Backend protocols and ports</caption><thead align="left"><tr id="elb_ug_jt_0002__row8933144564614"><th align="left" class="cellrowborder" valign="top" width="36.199999999999996%" id="mcps1.3.2.3.2.3.1.1"><p id="elb_ug_jt_0002__p129331845104611"><strong id="elb_ug_jt_0002__b677608673">Protocol</strong></p>
<div class="tablenoborder"><table cellpadding="4" cellspacing="0" summary="" id="elb_ug_jt_0002__table193210457467" frame="border" border="1" rules="all"><caption><b>Table 2 </b>Backend protocols and ports</caption><thead align="left"><tr id="elb_ug_jt_0002__row8933144564614"><th align="left" class="cellrowborder" valign="top" width="36.199999999999996%" id="mcps1.3.2.3.2.3.1.1"><p id="elb_ug_jt_0002__p129331845104611"><strong id="elb_ug_jt_0002__b780465299">Protocol</strong></p>
</th>
<th align="left" class="cellrowborder" valign="top" width="63.800000000000004%" id="mcps1.3.2.3.2.3.1.2"><p id="elb_ug_jt_0002__p17933204513468"><strong id="elb_ug_jt_0002__b993287581">Port</strong></p>
<th align="left" class="cellrowborder" valign="top" width="63.800000000000004%" id="mcps1.3.2.3.2.3.1.2"><p id="elb_ug_jt_0002__p17933204513468"><strong id="elb_ug_jt_0002__b1254081582">Port</strong></p>
</th>
</tr>
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@ -252,7 +252,7 @@
</li><li id="elb_ug_jt_0006__li943193482419">Click <strong id="elb_ug_jt_0006__b55385355551">Next: Confirm</strong>.</li><li id="elb_ug_jt_0006__li711125312231">Confirm the configuration and click <strong id="elb_ug_jt_0006__b1819613965514">Submit</strong>.</li></ol>
</div>
<div class="section" id="elb_ug_jt_0006__section18262194013551"><h4 class="sectiontitle">Adding a TCP Listener to a Shared Load Balancer</h4><ol id="elb_ug_jt_0006__ol1875172532711"><li id="elb_ug_jt_0006__li677391520332">Log in to the management console.</li><li id="elb_ug_jt_0006__li675519100420">In the upper left corner of the page, click <span><img id="elb_ug_jt_0006__image17463940122611" src="en-us_image_0000001747739624.png"></span> and select the desired region and project.</li><li id="elb_ug_jt_0006__li83736197297">Click <span><img id="elb_ug_jt_0006__image205046074425649" src="en-us_image_0000001794660485.png"></span> in the upper left corner to display <strong id="elb_ug_jt_0006__b45077072725649">Service List</strong> and choose <strong id="elb_ug_jt_0006__b188442616425649">Network</strong> &gt; <strong id="elb_ug_jt_0006__b73204407525649">Elastic Load Balancing</strong>.</li><li id="elb_ug_jt_0006__li44618046152949">Locate the load balancer and click its name.</li><li id="elb_ug_jt_0006__li13174175374113">Under <strong id="elb_ug_jt_0006__b896448438">Listeners</strong>, click <strong id="elb_ug_jt_0006__b18961048632">Add Listener</strong>. Configure the parameters based on <a href="#elb_ug_jt_0006__table20377204713512">Table 4</a>.
<div class="tablenoborder"><a name="elb_ug_jt_0006__table20377204713512"></a><a name="table20377204713512"></a><table cellpadding="4" cellspacing="0" summary="" id="elb_ug_jt_0006__table20377204713512" frame="border" border="1" rules="all"><caption><b>Table 4 </b>Parameters for configuring a listener for a shared load balancer</caption><thead align="left"><tr id="elb_ug_jt_0006__row1337215478357"><th align="left" class="cellrowborder" valign="top" width="23.419999999999998%" id="mcps1.3.4.2.5.4.2.4.1.1"><p id="elb_ug_jt_0006__p13372647103517"><strong id="elb_ug_jt_0006__b29961841995">Parameter</strong></p>
<div class="tablenoborder"><a name="elb_ug_jt_0006__table20377204713512"></a><a name="table20377204713512"></a><table cellpadding="4" cellspacing="0" summary="" id="elb_ug_jt_0006__table20377204713512" frame="border" border="1" rules="all"><caption><b>Table 4 </b>Parameters for configuring a listener for <span id="elb_ug_jt_0006__ph17571122272413">a shared</span> load balancer</caption><thead align="left"><tr id="elb_ug_jt_0006__row1337215478357"><th align="left" class="cellrowborder" valign="top" width="23.419999999999998%" id="mcps1.3.4.2.5.4.2.4.1.1"><p id="elb_ug_jt_0006__p13372647103517"><strong id="elb_ug_jt_0006__b29961841995">Parameter</strong></p>
</th>
<th align="left" class="cellrowborder" valign="top" width="46.72%" id="mcps1.3.4.2.5.4.2.4.1.2"><p id="elb_ug_jt_0006__p15372647173513">Description</p>
</th>
@ -285,7 +285,7 @@
<tr id="elb_ug_jt_0006__row147733330354"><td class="cellrowborder" valign="top" width="23.419999999999998%" headers="mcps1.3.4.2.5.4.2.4.1.1 "><p id="elb_ug_jt_0006__p4619133542414">Access Control</p>
</td>
<td class="cellrowborder" valign="top" width="46.72%" headers="mcps1.3.4.2.5.4.2.4.1.2 "><p id="elb_ug_jt_0006__p16195358244">Specifies how access to the listener is controlled. The following options are available (for details, see <a href="elb_03_0003.html">Access Control</a>):</p>
<ul id="elb_ug_jt_0006__ul161301312102917"><li id="elb_ug_jt_0006__li195061518192911"><strong id="elb_ug_jt_0006__b2023107829">All IP addresses</strong></li><li id="elb_ug_jt_0006__li16506191811299"><strong id="elb_ug_jt_0006__b519704670">Blacklist</strong></li><li id="elb_ug_jt_0006__li1150671815294"><strong id="elb_ug_jt_0006__b1365975022">Whitelist</strong></li></ul>
<ul id="elb_ug_jt_0006__ul161301312102917"><li id="elb_ug_jt_0006__li195061518192911"><strong id="elb_ug_jt_0006__b1390212082">All IP addresses</strong></li><li id="elb_ug_jt_0006__li16506191811299"><strong id="elb_ug_jt_0006__b1041065501">Blacklist</strong></li><li id="elb_ug_jt_0006__li1150671815294"><strong id="elb_ug_jt_0006__b1469250355">Whitelist</strong></li></ul>
</td>
<td class="cellrowborder" valign="top" width="29.86%" headers="mcps1.3.4.2.5.4.2.4.1.3 "><p id="elb_ug_jt_0006__p861993572415">Whitelist</p>
</td>
@ -310,7 +310,7 @@
<tr id="elb_ug_jt_0006__row102731948169"><td class="cellrowborder" valign="top" width="23.419999999999998%" headers="mcps1.3.4.2.5.4.2.4.1.1 "><p id="elb_ug_jt_0006__p182745413164">Idle Timeout</p>
</td>
<td class="cellrowborder" valign="top" width="46.72%" headers="mcps1.3.4.2.5.4.2.4.1.2 "><p id="elb_ug_jt_0006__p20589123471616">Specifies the length of time for a connection to keep alive, in seconds. If no request is received within this period, the load balancer closes the connection and establishes a new one with the client when the next request arrives.</p>
<p id="elb_ug_jt_0006__p1241475910491">The idle timeout duration ranges from <strong id="elb_ug_jt_0006__b882781464">10</strong> to <strong id="elb_ug_jt_0006__b1497897675">4000</strong>.</p>
<p id="elb_ug_jt_0006__p1241475910491">The idle timeout duration ranges from <strong id="elb_ug_jt_0006__b1602704925">10</strong> to <strong id="elb_ug_jt_0006__b1257644765">4000</strong>.</p>
</td>
<td class="cellrowborder" valign="top" width="29.86%" headers="mcps1.3.4.2.5.4.2.4.1.3 "><p id="elb_ug_jt_0006__p82759415168">300</p>
</td>
@ -345,7 +345,7 @@
<tbody><tr id="elb_ug_jt_0006__row26411431145416"><td class="cellrowborder" valign="top" width="23.419999999999998%" headers="mcps1.3.4.2.6.3.2.4.1.1 "><p id="elb_ug_jt_0006__p1664143119545">Backend Server Group</p>
</td>
<td class="cellrowborder" valign="top" width="50.43%" headers="mcps1.3.4.2.6.3.2.4.1.2 "><p id="elb_ug_jt_0006__p764133115547">Specifies a group of servers with the same features to receive requests from the load balancer. Two options are available:</p>
<ul id="elb_ug_jt_0006__ul166411531175417"><li id="elb_ug_jt_0006__li1864113318543"><strong id="elb_ug_jt_0006__b1202563475">Create new</strong></li><li id="elb_ug_jt_0006__li1664183111545"><strong id="elb_ug_jt_0006__b1907470994">Use existing</strong><div class="note" id="elb_ug_jt_0006__note68324943613"><span class="notetitle"> NOTE: </span><div class="notebody"><p id="elb_ug_jt_0006__en-us_topic_0167652121_p12855164710479">To associate an existing backend server group, ensure that it is not in use. Select the backend server group with the correct protocol. For example, if the frontend protocol is TCP, the backend protocol must be TCP.</p>
<ul id="elb_ug_jt_0006__ul166411531175417"><li id="elb_ug_jt_0006__li1864113318543"><strong id="elb_ug_jt_0006__b1530834227">Create new</strong></li><li id="elb_ug_jt_0006__li1664183111545"><strong id="elb_ug_jt_0006__b785624967">Use existing</strong><div class="note" id="elb_ug_jt_0006__note68324943613"><span class="notetitle"> NOTE: </span><div class="notebody"><p id="elb_ug_jt_0006__en-us_topic_0167652121_p12855164710479">To associate an existing backend server group, ensure that it is not in use. Select the backend server group with the correct protocol. For example, if the frontend protocol is TCP, the backend protocol must be TCP.</p>
</div></div>
</li></ul>
</td>
@ -370,8 +370,8 @@
<tr id="elb_ug_jt_0006__row2642831195413"><td class="cellrowborder" valign="top" width="23.419999999999998%" headers="mcps1.3.4.2.6.3.2.4.1.1 "><p id="elb_ug_jt_0006__p1664310315543">Load Balancing Algorithm</p>
</td>
<td class="cellrowborder" valign="top" width="50.43%" headers="mcps1.3.4.2.6.3.2.4.1.2 "><p id="elb_ug_jt_0006__p16643163175418">Specifies the algorithm used by the load balancer to distribute traffic. The following options are available:</p>
<ul id="elb_ug_jt_0006__ul12643183120546"><li id="elb_ug_jt_0006__li9643103175414"><strong id="elb_ug_jt_0006__b946128110">Weighted round robin</strong>: Requests are routed to different servers based on their weights, which indicate server processing performance. Backend servers with higher weights receive proportionately more requests, whereas equal-weighted servers receive the same number of requests.</li><li id="elb_ug_jt_0006__li19643131115412"><strong id="elb_ug_jt_0006__b9937153342418">Weighted least connections</strong>: This algorithm is designed based on the least connections algorithm that uses the number of active connections to each backend server to make its load balancing decision. In addition to the number of connections, each server is assigned a weight based on its capacity. Requests are routed to the server with the lowest connections-to-weight ratio.</li><li id="elb_ug_jt_0006__li364383110544"><strong id="elb_ug_jt_0006__b923224692417">Source IP hash</strong>: The source IP address of each request is calculated using the consistent hashing algorithm to obtain a unique hash key, and all backend servers are numbered. The generated key allocates the client to a particular server. This allows requests from different clients to be routed based on source IP addresses and ensures that a client is directed to the same server that it was using previously.</li></ul>
<div class="note" id="elb_ug_jt_0006__note464316316547"><span class="notetitle"> NOTE: </span><div class="notebody"><ul id="elb_ug_jt_0006__ul1064320316549"><li id="elb_ug_jt_0006__li5643123112545">Choose an appropriate algorithm based on your requirements for better traffic distribution.</li><li id="elb_ug_jt_0006__li106431331185413">For <strong id="elb_ug_jt_0006__b930919059">Weighted round robin</strong> or <strong id="elb_ug_jt_0006__b532606910">Weighted least connections</strong>, no requests will be routed to a server with a weight of 0.</li></ul>
<ul id="elb_ug_jt_0006__ul12643183120546"><li id="elb_ug_jt_0006__li9643103175414"><strong id="elb_ug_jt_0006__b1474010651">Weighted round robin</strong>: Requests are routed to different servers based on their weights, which indicate server processing performance. Backend servers with higher weights receive proportionately more requests, whereas equal-weighted servers receive the same number of requests.</li><li id="elb_ug_jt_0006__li19643131115412"><strong id="elb_ug_jt_0006__b9937153342418">Weighted least connections</strong>: This algorithm is designed based on the least connections algorithm that uses the number of active connections to each backend server to make its load balancing decision. In addition to the number of connections, each server is assigned a weight based on its capacity. Requests are routed to the server with the lowest connections-to-weight ratio.</li><li id="elb_ug_jt_0006__li364383110544"><strong id="elb_ug_jt_0006__b923224692417">Source IP hash</strong>: The source IP address of each request is calculated using the consistent hashing algorithm to obtain a unique hash key, and all backend servers are numbered. The generated key allocates the client to a particular server. This allows requests from different clients to be routed based on source IP addresses and ensures that a client is directed to the same server that it was using previously.</li></ul>
<div class="note" id="elb_ug_jt_0006__note464316316547"><span class="notetitle"> NOTE: </span><div class="notebody"><ul id="elb_ug_jt_0006__ul1064320316549"><li id="elb_ug_jt_0006__li5643123112545">Choose an appropriate algorithm based on your requirements for better traffic distribution.</li><li id="elb_ug_jt_0006__li106431331185413">For <strong id="elb_ug_jt_0006__b1132051578">Weighted round robin</strong> or <strong id="elb_ug_jt_0006__b192089328">Weighted least connections</strong>, no requests will be routed to a server with a weight of 0.</li></ul>
</div></div>
</td>
<td class="cellrowborder" valign="top" width="26.150000000000002%" headers="mcps1.3.4.2.6.3.2.4.1.3 "><p id="elb_ug_jt_0006__p5644193165411">Weighted round robin</p>
@ -388,7 +388,7 @@
</tr>
<tr id="elb_ug_jt_0006__row1164433113540"><td class="cellrowborder" valign="top" width="23.419999999999998%" headers="mcps1.3.4.2.6.3.2.4.1.1 "><p id="elb_ug_jt_0006__p4644193105412">Sticky Session Type</p>
</td>
<td class="cellrowborder" valign="top" width="50.43%" headers="mcps1.3.4.2.6.3.2.4.1.2 "><p id="elb_ug_jt_0006__p664463135412">Specifies the type of sticky sessions. <strong id="elb_ug_jt_0006__b909360028">Source IP address</strong> is the only choice available when TCP or UDP is used as the frontend protocol.</p>
<td class="cellrowborder" valign="top" width="50.43%" headers="mcps1.3.4.2.6.3.2.4.1.2 "><p id="elb_ug_jt_0006__p664463135412">Specifies the type of sticky sessions. <strong id="elb_ug_jt_0006__b530271451">Source IP address</strong> is the only choice available when TCP or UDP is used as the frontend protocol.</p>
<p id="elb_ug_jt_0006__p20644193145418"><strong id="elb_ug_jt_0006__b120948347834043">Source IP address</strong>: The source IP address of each request is calculated using the consistent hashing algorithm to obtain a unique hashing key, and all backend servers are numbered. The system allocates the client to a particular server based on the generated key. This allows requests from the same IP address to be forwarded to the same backend server.</p>
</td>
<td class="cellrowborder" valign="top" width="26.150000000000002%" headers="mcps1.3.4.2.6.3.2.4.1.3 "><p id="elb_ug_jt_0006__p264483125415">Source IP address</p>
@ -397,7 +397,7 @@
<tr id="elb_ug_jt_0006__row1364416318548"><td class="cellrowborder" valign="top" width="23.419999999999998%" headers="mcps1.3.4.2.6.3.2.4.1.1 "><p id="elb_ug_jt_0006__p1364533185412">Stickiness Duration (min)</p>
</td>
<td class="cellrowborder" valign="top" width="50.43%" headers="mcps1.3.4.2.6.3.2.4.1.2 "><p id="elb_ug_jt_0006__p1464563125417">Specifies the minutes that sticky sessions are maintained. You can enable sticky sessions only if you select <strong id="elb_ug_jt_0006__b146042100919">Weighted round robin</strong> for <strong id="elb_ug_jt_0006__b46092101098">Load Balancing Algorithm</strong>.</p>
<ul id="elb_ug_jt_0006__ul14645431165417"><li id="elb_ug_jt_0006__li3645103117546">Stickiness duration at Layer 4: <strong id="elb_ug_jt_0006__b606834643">1</strong> to <strong id="elb_ug_jt_0006__b1917178172">60</strong></li><li id="elb_ug_jt_0006__li14645153118548">Stickiness duration at Layer 7: <strong id="elb_ug_jt_0006__b64523484">1</strong> to <strong id="elb_ug_jt_0006__b1565071169">1440</strong></li></ul>
<ul id="elb_ug_jt_0006__ul14645431165417"><li id="elb_ug_jt_0006__li3645103117546">Stickiness duration at Layer 4: <strong id="elb_ug_jt_0006__b924870983">1</strong> to <strong id="elb_ug_jt_0006__b1801296565">60</strong></li><li id="elb_ug_jt_0006__li14645153118548">Stickiness duration at Layer 7: <strong id="elb_ug_jt_0006__b1968841873">1</strong> to <strong id="elb_ug_jt_0006__b1080033010">1440</strong></li></ul>
</td>
<td class="cellrowborder" valign="top" width="26.150000000000002%" headers="mcps1.3.4.2.6.3.2.4.1.3 "><p id="elb_ug_jt_0006__p1645931115413">20</p>
</td>
@ -463,8 +463,8 @@
<td class="cellrowborder" valign="top" width="46.7%" headers="mcps1.3.4.2.7.4.2.4.1.2 "><p id="elb_ug_jt_0006__p1736510122309">Specifies the health check URL, which is the destination on backend servers for health checks. This parameter is available only when the health check protocol is HTTP. The path must start with a slash (/) and can contain 1 to 80 characters.</p>
<p id="elb_ug_jt_0006__p6365151283011">The path can contain letters, digits, hyphens (-), slashes (/), periods (.), percent signs (%), ampersands (&amp;), and the following special characters: _~';@$*+,=!:()</p>
<div class="note" id="elb_ug_jt_0006__note185081029173013"><span class="notetitle"> NOTE: </span><div class="notebody"><p id="elb_ug_jt_0006__p1350892953015">Example:</p>
<p id="elb_ug_jt_0006__p11508192993020">If the URL is <strong id="elb_ug_jt_0006__b416203136">http://www.example.com/chat/try/</strong>, the health check path is <strong id="elb_ug_jt_0006__b1778454557">/chat/try/</strong>.</p>
<p id="elb_ug_jt_0006__p45089296302">If the URL is <strong id="elb_ug_jt_0006__b1273417126">http://192.168.63.187:9096/chat/index.html</strong>, the health check path is <strong id="elb_ug_jt_0006__b698054307">/chat/index.html</strong>.</p>
<p id="elb_ug_jt_0006__p11508192993020">If the URL is <strong id="elb_ug_jt_0006__b632306189">http://www.example.com/chat/try/</strong>, the health check path is <strong id="elb_ug_jt_0006__b1881860888">/chat/try/</strong>.</p>
<p id="elb_ug_jt_0006__p45089296302">If the URL is <strong id="elb_ug_jt_0006__b1085347206">http://192.168.63.187:9096/chat/index.html</strong>, the health check path is <strong id="elb_ug_jt_0006__b1056502054">/chat/index.html</strong>.</p>
</div></div>
</td>
<td class="cellrowborder" valign="top" width="29.880000000000003%" headers="mcps1.3.4.2.7.4.2.4.1.3 "><p id="elb_ug_jt_0006__p3127754162920">/index.html</p>
@ -473,7 +473,7 @@
<tr id="elb_ug_jt_0006__row456394163714"><td class="cellrowborder" valign="top" width="23.419999999999998%" headers="mcps1.3.4.2.7.4.2.4.1.1 "><p id="elb_ug_jt_0006__p195635417372">Interval (s)</p>
</td>
<td class="cellrowborder" valign="top" width="46.7%" headers="mcps1.3.4.2.7.4.2.4.1.2 "><p id="elb_ug_jt_0006__p10563104203711">Specifies the maximum time between two consecutive health checks, in seconds.</p>
<p id="elb_ug_jt_0006__p15639419374">The interval ranges from <strong id="elb_ug_jt_0006__b1422840057">1</strong> to <strong id="elb_ug_jt_0006__b217651104">50</strong>.</p>
<p id="elb_ug_jt_0006__p15639419374">The interval ranges from <strong id="elb_ug_jt_0006__b1143019790">1</strong> to <strong id="elb_ug_jt_0006__b1146115893">50</strong>.</p>
</td>
<td class="cellrowborder" valign="top" width="29.880000000000003%" headers="mcps1.3.4.2.7.4.2.4.1.3 "><p id="elb_ug_jt_0006__p5563148375">5</p>
</td>
@ -487,7 +487,7 @@
</tr>
<tr id="elb_ug_jt_0006__row16567144143718"><td class="cellrowborder" valign="top" width="23.419999999999998%" headers="mcps1.3.4.2.7.4.2.4.1.1 "><p id="elb_ug_jt_0006__p356411463720">Maximum Retries</p>
</td>
<td class="cellrowborder" valign="top" width="46.7%" headers="mcps1.3.4.2.7.4.2.4.1.2 "><p id="elb_ug_jt_0006__p3567184103716">Specifies the maximum number of health check retries. The value ranges from <strong id="elb_ug_jt_0006__b1756956725">1</strong> to <strong id="elb_ug_jt_0006__b1102068457">10</strong>.</p>
<td class="cellrowborder" valign="top" width="46.7%" headers="mcps1.3.4.2.7.4.2.4.1.2 "><p id="elb_ug_jt_0006__p3567184103716">Specifies the maximum number of health check retries. The value ranges from <strong id="elb_ug_jt_0006__b29559283">1</strong> to <strong id="elb_ug_jt_0006__b1642833973">10</strong>.</p>
</td>
<td class="cellrowborder" valign="top" width="29.880000000000003%" headers="mcps1.3.4.2.7.4.2.4.1.3 "><p id="elb_ug_jt_0006__p11567194133711">3</p>
</td>

View File

@ -231,7 +231,7 @@
</li><li id="elb_ug_jt_0007__li943193482419">Click <strong id="elb_ug_jt_0007__b15155922164117">Next: Confirm</strong>.</li><li id="elb_ug_jt_0007__li4123203843620">Confirm the configuration and click <strong id="elb_ug_jt_0007__b783814301413">Submit</strong>.</li></ol>
</div>
<div class="section" id="elb_ug_jt_0007__section18262194013551"><h4 class="sectiontitle">Adding a UDP Listener to a <span id="elb_ug_jt_0007__ph1952892414212">Shared</span> Load Balancer</h4><ol id="elb_ug_jt_0007__ol1875172532711"><li id="elb_ug_jt_0007__li677391520332">Log in to the management console.</li><li id="elb_ug_jt_0007__li675519100420">In the upper left corner of the page, click <span><img id="elb_ug_jt_0007__image5252736123219" src="en-us_image_0000001747739624.png"></span> and select the desired region and project.</li><li id="elb_ug_jt_0007__li83736197297">Click <span><img id="elb_ug_jt_0007__image86956224225654" src="en-us_image_0000001794660485.png"></span> in the upper left corner to display <strong id="elb_ug_jt_0007__b140531780025654">Service List</strong> and choose <strong id="elb_ug_jt_0007__b66535751125654">Network</strong> &gt; <strong id="elb_ug_jt_0007__b187081799925654">Elastic Load Balancing</strong>.</li><li id="elb_ug_jt_0007__li44618046152949">Locate the load balancer and click its name.</li><li id="elb_ug_jt_0007__li13174175374113">Under <strong id="elb_ug_jt_0007__b192070718410">Listeners</strong>, click <strong id="elb_ug_jt_0007__b620718716420">Add Listener</strong>. Configure the parameters based on <a href="#elb_ug_jt_0007__table20377204713512">Table 4</a>.
<div class="tablenoborder"><a name="elb_ug_jt_0007__table20377204713512"></a><a name="table20377204713512"></a><table cellpadding="4" cellspacing="0" summary="" id="elb_ug_jt_0007__table20377204713512" frame="border" border="1" rules="all"><caption><b>Table 4 </b>Parameters for configuring a listener for a <span id="elb_ug_jt_0007__ph8274125933214">shared</span> load balancer</caption><thead align="left"><tr id="elb_ug_jt_0007__row1337215478357"><th align="left" class="cellrowborder" valign="top" width="23.419999999999998%" id="mcps1.3.4.2.5.4.2.4.1.1"><p id="elb_ug_jt_0007__p13372647103517">Parameter</p>
<div class="tablenoborder"><a name="elb_ug_jt_0007__table20377204713512"></a><a name="table20377204713512"></a><table cellpadding="4" cellspacing="0" summary="" id="elb_ug_jt_0007__table20377204713512" frame="border" border="1" rules="all"><caption><b>Table 4 </b>Parameters for configuring a listener for <span id="elb_ug_jt_0007__ph114732527244">a shared</span> load balancer</caption><thead align="left"><tr id="elb_ug_jt_0007__row1337215478357"><th align="left" class="cellrowborder" valign="top" width="23.419999999999998%" id="mcps1.3.4.2.5.4.2.4.1.1"><p id="elb_ug_jt_0007__p13372647103517">Parameter</p>
</th>
<th align="left" class="cellrowborder" valign="top" width="46.72%" id="mcps1.3.4.2.5.4.2.4.1.2"><p id="elb_ug_jt_0007__p15372647173513">Description</p>
</th>
@ -422,21 +422,21 @@
<tr id="elb_ug_jt_0007__row20146194911016"><td class="cellrowborder" valign="top" width="23.419999999999998%" headers="mcps1.3.4.2.7.4.2.4.1.1 "><p id="elb_ug_jt_0007__p11146194916103">Interval (s)</p>
</td>
<td class="cellrowborder" valign="top" width="46.7%" headers="mcps1.3.4.2.7.4.2.4.1.2 "><p id="elb_ug_jt_0007__p41469494109">Specifies the maximum time between two consecutive health checks, in seconds.</p>
<p id="elb_ug_jt_0007__p1014624915101">The interval ranges from <strong id="elb_ug_jt_0007__b90806568">1</strong> to <strong id="elb_ug_jt_0007__b2128854135">50</strong>.</p>
<p id="elb_ug_jt_0007__p1014624915101">The interval ranges from <strong id="elb_ug_jt_0007__b711546200">1</strong> to <strong id="elb_ug_jt_0007__b2013367917">50</strong>.</p>
</td>
<td class="cellrowborder" valign="top" width="29.880000000000003%" headers="mcps1.3.4.2.7.4.2.4.1.3 "><p id="elb_ug_jt_0007__p1146549141010">5</p>
</td>
</tr>
<tr id="elb_ug_jt_0007__row1314618498109"><td class="cellrowborder" valign="top" width="23.419999999999998%" headers="mcps1.3.4.2.7.4.2.4.1.1 "><p id="elb_ug_jt_0007__p13146449131013">Timeout (s)</p>
</td>
<td class="cellrowborder" valign="top" width="46.7%" headers="mcps1.3.4.2.7.4.2.4.1.2 "><p id="elb_ug_jt_0007__p61462049191011">Specifies the maximum time required for waiting for a response from the health check, in seconds. The timeout duration ranges from <strong id="elb_ug_jt_0007__b1577294524">1</strong> to <strong id="elb_ug_jt_0007__b1442731114">50</strong>.</p>
<td class="cellrowborder" valign="top" width="46.7%" headers="mcps1.3.4.2.7.4.2.4.1.2 "><p id="elb_ug_jt_0007__p61462049191011">Specifies the maximum time required for waiting for a response from the health check, in seconds. The timeout duration ranges from <strong id="elb_ug_jt_0007__b317379825">1</strong> to <strong id="elb_ug_jt_0007__b1112244442">50</strong>.</p>
</td>
<td class="cellrowborder" valign="top" width="29.880000000000003%" headers="mcps1.3.4.2.7.4.2.4.1.3 "><p id="elb_ug_jt_0007__p7146174921012">3</p>
</td>
</tr>
<tr id="elb_ug_jt_0007__row714644913103"><td class="cellrowborder" valign="top" width="23.419999999999998%" headers="mcps1.3.4.2.7.4.2.4.1.1 "><p id="elb_ug_jt_0007__p814611499101">Maximum Retries</p>
</td>
<td class="cellrowborder" valign="top" width="46.7%" headers="mcps1.3.4.2.7.4.2.4.1.2 "><p id="elb_ug_jt_0007__p0146154917101">Specifies the maximum number of health check retries. The value ranges from <strong id="elb_ug_jt_0007__b1977971391">1</strong> to <strong id="elb_ug_jt_0007__b785118552">10</strong>.</p>
<td class="cellrowborder" valign="top" width="46.7%" headers="mcps1.3.4.2.7.4.2.4.1.2 "><p id="elb_ug_jt_0007__p0146154917101">Specifies the maximum number of health check retries. The value ranges from <strong id="elb_ug_jt_0007__b885910138">1</strong> to <strong id="elb_ug_jt_0007__b1760848717">10</strong>.</p>
</td>
<td class="cellrowborder" valign="top" width="29.880000000000003%" headers="mcps1.3.4.2.7.4.2.4.1.3 "><p id="elb_ug_jt_0007__p1314664961018">3</p>
</td>

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@ -49,7 +49,7 @@
</td>
<td class="cellrowborder" valign="top" width="48.9%" headers="mcps1.3.3.2.5.4.2.4.1.2 "><p id="elb_ug_jt_0008__p756712251178">Specifies the HTTPS listener to which requests are redirected.</p>
</td>
<td class="cellrowborder" valign="top" width="26.66%" headers="mcps1.3.3.2.5.4.2.4.1.3 "><p id="elb_ug_jt_0008__p530234871818">listener_HTTPS_443</p>
<td class="cellrowborder" valign="top" width="26.66%" headers="mcps1.3.3.2.5.4.2.4.1.3 "><p id="elb_ug_jt_0008__p530234871818">listener-9ecd (HTTPS/443)</p>
</td>
</tr>
<tr id="elb_ug_jt_0008__row3996052142310"><td class="cellrowborder" valign="top" width="24.44%" headers="mcps1.3.3.2.5.4.2.4.1.1 "><p id="elb_ug_jt_0008__p15996195216233">Access Control</p>
@ -309,7 +309,7 @@
</li><li id="elb_ug_jt_0008__li943193482419">Click <strong id="elb_ug_jt_0008__b1867071724612">Next: Confirm</strong>.</li><li id="elb_ug_jt_0008__li179621119143711">Confirm the configuration and click <strong id="elb_ug_jt_0008__b1930981912464">Submit</strong>.</li></ol>
</div>
<div class="section" id="elb_ug_jt_0008__section18262194013551"><h4 class="sectiontitle">Adding an HTTP Listener to a <span id="elb_ug_jt_0008__ph1952892414212">Shared</span> Load Balancer</h4><ol id="elb_ug_jt_0008__ol1875172532711"><li id="elb_ug_jt_0008__li677391520332">Log in to the management console.</li><li id="elb_ug_jt_0008__li675519100420">In the upper left corner of the page, click <span><img id="elb_ug_jt_0008__image12377556163410" src="en-us_image_0000001747739624.png"></span> and select the desired region and project.</li><li id="elb_ug_jt_0008__li83736197297">Click <span><img id="elb_ug_jt_0008__image3543004382572" src="en-us_image_0000001794660485.png"></span> in the upper left corner to display <strong id="elb_ug_jt_0008__b11879003392572">Service List</strong> and choose <strong id="elb_ug_jt_0008__b17523671892572">Network</strong> &gt; <strong id="elb_ug_jt_0008__b16453022652572">Elastic Load Balancing</strong>.</li><li id="elb_ug_jt_0008__li44618046152949">Locate the load balancer and click its name.</li><li id="elb_ug_jt_0008__li13174175374113">Under <strong id="elb_ug_jt_0008__b755411348412">Listeners</strong>, click <strong id="elb_ug_jt_0008__b17554634154118">Add Listener</strong>. Configure the parameters based on <a href="#elb_ug_jt_0008__table20377204713512">Table 4</a>.
<div class="tablenoborder"><a name="elb_ug_jt_0008__table20377204713512"></a><a name="table20377204713512"></a><table cellpadding="4" cellspacing="0" summary="" id="elb_ug_jt_0008__table20377204713512" frame="border" border="1" rules="all"><caption><b>Table 4 </b>Parameters for configuring a listener for a shared enhanced load balancer</caption><thead align="left"><tr id="elb_ug_jt_0008__row1337215478357"><th align="left" class="cellrowborder" valign="top" width="23.419999999999998%" id="mcps1.3.4.2.5.4.2.4.1.1"><p id="elb_ug_jt_0008__p13372647103517">Parameter</p>
<div class="tablenoborder"><a name="elb_ug_jt_0008__table20377204713512"></a><a name="table20377204713512"></a><table cellpadding="4" cellspacing="0" summary="" id="elb_ug_jt_0008__table20377204713512" frame="border" border="1" rules="all"><caption><b>Table 4 </b>Parameters for configuring a listener for <span id="elb_ug_jt_0008__ph107259308455">a shared</span> load balancer</caption><thead align="left"><tr id="elb_ug_jt_0008__row1337215478357"><th align="left" class="cellrowborder" valign="top" width="23.419999999999998%" id="mcps1.3.4.2.5.4.2.4.1.1"><p id="elb_ug_jt_0008__p13372647103517">Parameter</p>
</th>
<th align="left" class="cellrowborder" valign="top" width="46.72%" id="mcps1.3.4.2.5.4.2.4.1.2"><p id="elb_ug_jt_0008__p15372647173513">Description</p>
</th>
@ -352,7 +352,7 @@
</td>
<td class="cellrowborder" valign="top" width="46.72%" headers="mcps1.3.4.2.5.4.2.4.1.2 "><p id="elb_ug_jt_0008__p89419186916">Specifies the HTTPS listener to which requests are redirected.</p>
</td>
<td class="cellrowborder" valign="top" width="29.86%" headers="mcps1.3.4.2.5.4.2.4.1.3 "><p id="elb_ug_jt_0008__p49417183912">listener-9ecd (HTTPS/443)</p>
<td class="cellrowborder" valign="top" width="29.86%" headers="mcps1.3.4.2.5.4.2.4.1.3 "><p id="elb_ug_jt_0008__p1173618105323">listener-9ecd (HTTPS/443)</p>
</td>
</tr>
<tr id="elb_ug_jt_0008__row147733330354"><td class="cellrowborder" valign="top" width="23.419999999999998%" headers="mcps1.3.4.2.5.4.2.4.1.1 "><p id="elb_ug_jt_0008__p4619133542414">Access Control</p>
@ -531,7 +531,7 @@
<tbody><tr id="elb_ug_jt_0008__en-us_topic_0167652121_row104051544123714"><td class="cellrowborder" valign="top" width="23.419999999999998%" headers="mcps1.3.4.2.7.4.2.4.1.1 "><p id="elb_ug_jt_0008__en-us_topic_0167652121_p20405144417379">Health Check</p>
</td>
<td class="cellrowborder" valign="top" width="46.7%" headers="mcps1.3.4.2.7.4.2.4.1.2 "><p id="elb_ug_jt_0008__en-us_topic_0167652121_p140611444372">Specifies whether to enable health checks.</p>
<p id="elb_ug_jt_0008__en-us_topic_0167652121_p432619251734">If the health check is enabled, click <span><img id="elb_ug_jt_0008__image978515311" src="en-us_image_0000001747739732.png"></span> next to <strong id="elb_ug_jt_0008__b701930336">Advanced Settings</strong> to set health check parameters.</p>
<p id="elb_ug_jt_0008__en-us_topic_0167652121_p432619251734">If the health check is enabled, click <span><img id="elb_ug_jt_0008__image1022488894" src="en-us_image_0000001747739732.png"></span> next to <strong id="elb_ug_jt_0008__b1465803151">Advanced Settings</strong> to set health check parameters.</p>
</td>
<td class="cellrowborder" valign="top" width="29.880000000000003%" headers="mcps1.3.4.2.7.4.2.4.1.3 "><p id="elb_ug_jt_0008__en-us_topic_0167652121_p1840674483717">N/A</p>
</td>
@ -556,7 +556,7 @@
</tr>
<tr id="elb_ug_jt_0008__en-us_topic_0167652121_row104061344133710"><td class="cellrowborder" valign="top" width="23.419999999999998%" headers="mcps1.3.4.2.7.4.2.4.1.1 "><p id="elb_ug_jt_0008__en-us_topic_0167652121_p840654411370">Health Check Port</p>
</td>
<td class="cellrowborder" valign="top" width="46.7%" headers="mcps1.3.4.2.7.4.2.4.1.2 "><p id="elb_ug_jt_0008__en-us_topic_0167652121_p164060442378">Specifies the port that will be used by the load balancer to check the health of backend servers. The port number ranges from <strong id="elb_ug_jt_0008__b1262254959">1</strong> to <strong id="elb_ug_jt_0008__b777682220">65535</strong>.</p>
<td class="cellrowborder" valign="top" width="46.7%" headers="mcps1.3.4.2.7.4.2.4.1.2 "><p id="elb_ug_jt_0008__en-us_topic_0167652121_p164060442378">Specifies the port that will be used by the load balancer to check the health of backend servers. The port number ranges from <strong id="elb_ug_jt_0008__b2091788736">1</strong> to <strong id="elb_ug_jt_0008__b1561769">65535</strong>.</p>
<div class="note" id="elb_ug_jt_0008__en-us_topic_0167652121_note16406114419377"><span class="notetitle"> NOTE: </span><div class="notebody"><p id="elb_ug_jt_0008__en-us_topic_0167652121_p1740634418373">By default, the service port on each backend server is used. You can also specify a port for health checks.</p>
</div></div>
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@ -362,7 +362,7 @@
</li><li id="elb_ug_jt_0009__li943193482419">Click <strong id="elb_ug_jt_0009__b3307105314110">Next: Confirm</strong>.</li><li id="elb_ug_jt_0009__li1188212388377">Confirm the configuration and click <strong id="elb_ug_jt_0009__b134848551418">Submit</strong>.</li></ol>
</div>
<div class="section" id="elb_ug_jt_0009__section18262194013551"><h4 class="sectiontitle">Adding an HTTPS Listener to a <span id="elb_ug_jt_0009__ph144760096142051">Shared</span> Load Balancer</h4><ol id="elb_ug_jt_0009__ol1875172532711"><li id="elb_ug_jt_0009__li677391520332">Log in to the management console.</li><li id="elb_ug_jt_0009__li675519100420">In the upper left corner of the page, click <span><img id="elb_ug_jt_0009__image10312446183711" src="en-us_image_0000001747739624.png"></span> and select the desired region and project.</li><li id="elb_ug_jt_0009__li83736197297">Click <span><img id="elb_ug_jt_0009__image136257942842051" src="en-us_image_0000001794660485.png"></span> in the upper left corner to display <strong id="elb_ug_jt_0009__b183496179942051">Service List</strong> and choose <strong id="elb_ug_jt_0009__b199290337842051">Network</strong> &gt; <strong id="elb_ug_jt_0009__b117376806642051">Elastic Load Balancing</strong>.</li><li id="elb_ug_jt_0009__li44618046152949">Locate the load balancer and click its name.</li><li id="elb_ug_jt_0009__li13174175374113">Under <strong id="elb_ug_jt_0009__b104542028133414">Listeners</strong>, click <strong id="elb_ug_jt_0009__b13454122813418">Add Listener</strong>. Configure the parameters based on <a href="#elb_ug_jt_0009__table1093233819544">Table 4</a>.
<div class="tablenoborder"><a name="elb_ug_jt_0009__table1093233819544"></a><a name="table1093233819544"></a><table cellpadding="4" cellspacing="0" summary="" id="elb_ug_jt_0009__table1093233819544" frame="border" border="1" rules="all"><caption><b>Table 4 </b>Parameters for configuring a listener for a shared enhanced load balancer</caption><thead align="left"><tr id="elb_ug_jt_0009__row693273814544"><th align="left" class="cellrowborder" valign="top" width="26.1%" id="mcps1.3.4.2.5.4.2.4.1.1"><p id="elb_ug_jt_0009__p79321338145410">Parameter</p>
<div class="tablenoborder"><a name="elb_ug_jt_0009__table1093233819544"></a><a name="table1093233819544"></a><table cellpadding="4" cellspacing="0" summary="" id="elb_ug_jt_0009__table1093233819544" frame="border" border="1" rules="all"><caption><b>Table 4 </b>Parameters for configuring a listener for <span id="elb_ug_jt_0009__ph14226145014234">a shared</span> load balancer</caption><thead align="left"><tr id="elb_ug_jt_0009__row693273814544"><th align="left" class="cellrowborder" valign="top" width="26.1%" id="mcps1.3.4.2.5.4.2.4.1.1"><p id="elb_ug_jt_0009__p79321338145410">Parameter</p>
</th>
<th align="left" class="cellrowborder" valign="top" width="44.73%" id="mcps1.3.4.2.5.4.2.4.1.2"><p id="elb_ug_jt_0009__p1093283895415">Description</p>
</th>
@ -439,7 +439,7 @@
<tr id="elb_ug_jt_0009__row7933193875417"><td class="cellrowborder" valign="top" width="26.1%" headers="mcps1.3.4.2.5.4.2.4.1.1 "><p id="elb_ug_jt_0009__p217515527376">Access Control</p>
</td>
<td class="cellrowborder" valign="top" width="44.73%" headers="mcps1.3.4.2.5.4.2.4.1.2 "><p id="elb_ug_jt_0009__p91761452133713">Specifies how access to the listener is controlled. The following options are available (for details, see <a href="elb_03_0003.html">Access Control</a>):</p>
<ul id="elb_ug_jt_0009__ul101761652153710"><li id="elb_ug_jt_0009__li201764521376"><strong id="elb_ug_jt_0009__b466415611151">All IP addresses</strong></li><li id="elb_ug_jt_0009__li16176125223714"><strong id="elb_ug_jt_0009__b1441414363">Blacklist</strong></li><li id="elb_ug_jt_0009__li131768522371"><strong id="elb_ug_jt_0009__b1285518110163">Whitelist</strong></li></ul>
<ul id="elb_ug_jt_0009__ul101761652153710"><li id="elb_ug_jt_0009__li201764521376"><strong id="elb_ug_jt_0009__b466415611151">All IP addresses</strong></li><li id="elb_ug_jt_0009__li16176125223714"><strong id="elb_ug_jt_0009__b1400417011">Blacklist</strong></li><li id="elb_ug_jt_0009__li131768522371"><strong id="elb_ug_jt_0009__b1285518110163">Whitelist</strong></li></ul>
</td>
<td class="cellrowborder" valign="top" width="29.17%" headers="mcps1.3.4.2.5.4.2.4.1.3 "><p id="elb_ug_jt_0009__p1617618528377"><strong id="elb_ug_jt_0009__b28581917169">Whitelist</strong></p>
</td>
@ -658,8 +658,8 @@
<p id="elb_ug_jt_0009__p6329101613114">This parameter is available when the health check protocol is HTTP. The path can contain 1 to 80 characters and <span id="elb_ug_jt_0009__ph1584695455113">must start with a slash (/)</span>.</p>
<p id="elb_ug_jt_0009__p18329121663112">The path can contain letters, digits, hyphens (-), slashes (/), periods (.), question marks (?), percent signs (%), ampersands (&amp;), and underscores (_).</p>
<div class="note" id="elb_ug_jt_0009__note01977426321"><span class="notetitle"> NOTE: </span><div class="notebody"><p id="elb_ug_jt_0009__p131976426325">Example:</p>
<p id="elb_ug_jt_0009__p10197164213214">If the URL is <strong id="elb_ug_jt_0009__b352004125">http://www.example.com/chat/try/</strong>, the health check path is <strong id="elb_ug_jt_0009__b1067328717">/chat/try/</strong>.</p>
<p id="elb_ug_jt_0009__p71971142103220">If the URL is <strong id="elb_ug_jt_0009__b186385388">http://192.168.63.187:9096/chat/index.html</strong>, the health check path is <strong id="elb_ug_jt_0009__b1810280332">/chat/index.html</strong>.</p>
<p id="elb_ug_jt_0009__p10197164213214">If the URL is <strong id="elb_ug_jt_0009__b767073357">http://www.example.com/chat/try/</strong>, the health check path is <strong id="elb_ug_jt_0009__b1863259755">/chat/try/</strong>.</p>
<p id="elb_ug_jt_0009__p71971142103220">If the URL is <strong id="elb_ug_jt_0009__b224928269">http://192.168.63.187:9096/chat/index.html</strong>, the health check path is <strong id="elb_ug_jt_0009__b1713773902">/chat/index.html</strong>.</p>
</div></div>
</td>
<td class="cellrowborder" valign="top" width="29.880000000000003%" headers="mcps1.3.4.2.7.4.2.4.1.3 "><p id="elb_ug_jt_0009__p11197442113214">/index.html</p>
@ -668,21 +668,21 @@
<tr id="elb_ug_jt_0009__row919854273217"><td class="cellrowborder" valign="top" width="23.419999999999998%" headers="mcps1.3.4.2.7.4.2.4.1.1 "><p id="elb_ug_jt_0009__p16198144212324">Interval (s)</p>
</td>
<td class="cellrowborder" valign="top" width="46.7%" headers="mcps1.3.4.2.7.4.2.4.1.2 "><p id="elb_ug_jt_0009__p6198742153217">Specifies the maximum time between two consecutive health checks, in seconds.</p>
<p id="elb_ug_jt_0009__p2198184212321">The interval ranges from <strong id="elb_ug_jt_0009__b2032908073">1</strong> to <strong id="elb_ug_jt_0009__b1822788972">50</strong>.</p>
<p id="elb_ug_jt_0009__p2198184212321">The interval ranges from <strong id="elb_ug_jt_0009__b1907139226">1</strong> to <strong id="elb_ug_jt_0009__b1928192260">50</strong>.</p>
</td>
<td class="cellrowborder" valign="top" width="29.880000000000003%" headers="mcps1.3.4.2.7.4.2.4.1.3 "><p id="elb_ug_jt_0009__p1919844273219">5</p>
</td>
</tr>
<tr id="elb_ug_jt_0009__row1219854243215"><td class="cellrowborder" valign="top" width="23.419999999999998%" headers="mcps1.3.4.2.7.4.2.4.1.1 "><p id="elb_ug_jt_0009__p19198174215329">Timeout (s)</p>
</td>
<td class="cellrowborder" valign="top" width="46.7%" headers="mcps1.3.4.2.7.4.2.4.1.2 "><p id="elb_ug_jt_0009__p141986425324">Specifies the maximum time required for waiting for a response from the health check, in seconds. The timeout duration ranges from <strong id="elb_ug_jt_0009__b807896944">1</strong> to <strong id="elb_ug_jt_0009__b2009164790">50</strong>.</p>
<td class="cellrowborder" valign="top" width="46.7%" headers="mcps1.3.4.2.7.4.2.4.1.2 "><p id="elb_ug_jt_0009__p141986425324">Specifies the maximum time required for waiting for a response from the health check, in seconds. The timeout duration ranges from <strong id="elb_ug_jt_0009__b1243389213">1</strong> to <strong id="elb_ug_jt_0009__b459629627">50</strong>.</p>
</td>
<td class="cellrowborder" valign="top" width="29.880000000000003%" headers="mcps1.3.4.2.7.4.2.4.1.3 "><p id="elb_ug_jt_0009__p1919814273217">3</p>
</td>
</tr>
<tr id="elb_ug_jt_0009__row1319814223211"><td class="cellrowborder" valign="top" width="23.419999999999998%" headers="mcps1.3.4.2.7.4.2.4.1.1 "><p id="elb_ug_jt_0009__p119814293212">Maximum Retries</p>
</td>
<td class="cellrowborder" valign="top" width="46.7%" headers="mcps1.3.4.2.7.4.2.4.1.2 "><p id="elb_ug_jt_0009__p4198842153219">Specifies the maximum number of health check retries. The value ranges from <strong id="elb_ug_jt_0009__b363175372">1</strong> to <strong id="elb_ug_jt_0009__b876347537">10</strong>.</p>
<td class="cellrowborder" valign="top" width="46.7%" headers="mcps1.3.4.2.7.4.2.4.1.2 "><p id="elb_ug_jt_0009__p4198842153219">Specifies the maximum number of health check retries. The value ranges from <strong id="elb_ug_jt_0009__b960579383">1</strong> to <strong id="elb_ug_jt_0009__b626677899">10</strong>.</p>
</td>
<td class="cellrowborder" valign="top" width="29.880000000000003%" headers="mcps1.3.4.2.7.4.2.4.1.3 "><p id="elb_ug_jt_0009__p3198184273218">3</p>
</td>

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@ -1,7 +1,7 @@
<a name="elb_ug_pe_0000"></a><a name="elb_ug_pe_0000"></a>
<h1 class="topictitle1">Quotas</h1>
<div id="body32001227"><div class="section" id="elb_ug_pe_0000__en-us_topic_0040259342_section102291042164212"><h4 class="sectiontitle">What Is Quota?</h4><p id="elb_ug_pe_0000__en-us_topic_0040259342_p1415804616467">Quotas can limit the number or amount of resources available to users, such as the maximum number of ECSs or EVS disks that can be created.</p>
<div id="body8662426"><div class="section" id="elb_ug_pe_0000__en-us_topic_0040259342_section102291042164212"><h4 class="sectiontitle">What Is Quota?</h4><p id="elb_ug_pe_0000__en-us_topic_0040259342_p1415804616467">Quotas can limit the number or amount of resources available to users, such as the maximum number of ECSs or EVS disks that can be created.</p>
<p id="elb_ug_pe_0000__en-us_topic_0040259342_p547171214515">If the existing resource quota cannot meet your service requirements, you can apply for a higher quota.</p>
</div>
<div class="section" id="elb_ug_pe_0000__en-us_topic_0040259342_section07760615438"><h4 class="sectiontitle">How Do I View My Quotas?</h4><ol id="elb_ug_pe_0000__en-us_topic_0040259342_ol1222775692215"><li id="elb_ug_pe_0000__en-us_topic_0040259342_li5648642910048">Log in to the management console.</li><li id="elb_ug_pe_0000__en-us_topic_0040259342_li464234814566">Click <span><img id="elb_ug_pe_0000__en-us_topic_0040259342_en-us_topic_0014250631_en-us_topic_0014250631_image1733511156361" src="en-us_image_0000001794820065.png"></span> in the upper left corner and select the desired region and project.</li><li id="elb_ug_pe_0000__en-us_topic_0040259342_li3861581410048">In the upper right corner of the page, click <span><img id="elb_ug_pe_0000__en-us_topic_0040259342_image99377514309" src="en-us_image_0000001747740124.png"></span>.<p id="elb_ug_pe_0000__en-us_topic_0040259342_p1748884433119">The <strong id="elb_ug_pe_0000__en-us_topic_0040259342_b695801964614">Service Quota</strong> page is displayed.</p>

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@ -1,7 +1,7 @@
<a name="elb_ug_zs_0001"></a><a name="elb_ug_zs_0001"></a>
<h1 class="topictitle1">Introduction to Certificates</h1>
<div id="body1568279650633"><div class="p" id="elb_ug_zs_0001__p15599165234617">ELB supports two types of certificates. If you need an HTTPS listener, you need to bind a server certificate to it. To enable mutual authentication, you also need to bind a CA certificate to the listener.<ul id="elb_ug_zs_0001__ul1161121344720"><li id="elb_ug_zs_0001__li361271315471"><strong id="elb_ug_zs_0001__en-us_topic_0092382557_b842352706103646">Server certificate</strong>: used for SSL handshake negotiations if an HTTPS listener is used. Both the certificate content and private key are required.</li><li id="elb_ug_zs_0001__li16679142610476"><strong id="elb_ug_zs_0001__en-us_topic_0092382557_b842352706163412">CA certificate</strong>: issued by a certificate authority (CA) and used to verify the certificate issuer. If HTTPS mutual authentication is required, HTTPS connections can be established only when the client provides a certificate issued by a specific CA.</li></ul>
<div id="body1568279650633"><div class="p" id="elb_ug_zs_0001__p15599165234617">ELB supports two types of certificates. If you need an HTTPS listener, you need to bind a server certificate to it. To enable mutual authentication, you also need to bind a CA certificate to the listener.<ul id="elb_ug_zs_0001__ul1161121344720"><li id="elb_ug_zs_0001__li361271315471"><strong id="elb_ug_zs_0001__b133625373415">Server certificate</strong>: used for SSL handshake negotiations if an HTTPS listener is used. Both the certificate content and private key are required.</li><li id="elb_ug_zs_0001__li16679142610476"><strong id="elb_ug_zs_0001__b122241944164317">CA certificate</strong>: issued by a certificate authority (CA) and used to verify the certificate issuer. If HTTPS mutual authentication is required, HTTPS connections can be established only when the client provides a certificate issued by a specific CA.</li></ul>
</div>
<div class="section" id="elb_ug_zs_0001__section141811491934"><h4 class="sectiontitle">Precautions</h4><ul id="elb_ug_zs_0001__ul3531546343"><li id="elb_ug_zs_0001__li4919212358">A certificate can be used by multiple load balancers but only needs to be uploaded to each load balancer once.</li><li id="elb_ug_zs_0001__li11434163714188">If a certificate is used for SNI, you need to specify a domain name for the certificate, and the domain name must be the same as that in the certificate.</li><li id="elb_ug_zs_0001__li10547461041">For each certificate type, a listener can have only one certificate by default, but a certificate can be bound to more than one listener. If SNI is enabled for the listener, multiple server certificates can be bound.</li><li id="elb_ug_zs_0001__li12629145412410">Only original certificates are supported. That is to say, you cannot encrypt your certificates.</li><li id="elb_ug_zs_0001__li1070105915418">You do not need to configure certificates for both the <span id="elb_ug_zs_0001__ph145991356165413">shared</span> load balancer and the associated backend servers. If you configure a certificate for backend servers, HTTPS listeners cannot be added to the load balancer. In this case, you can add a TCP listener to transparently transmit HTTPS traffic to backend servers. This restriction does not apply to dedicated load balancers.</li><li id="elb_ug_zs_0001__li14572471057">You can use self-signed certificates. However, note that self-signed certificates pose security risks. Therefore, it is recommended that you use certificates issued by third parties.</li><li id="elb_ug_zs_0001__li193281743163514">ELB supports certificates only in PEM format. If you have a certificate in any other format, you must convert it to a PEM-encoded certificate.</li><li id="elb_ug_zs_0001__li11462133114110">If a certificate has expired, you need to manually replace or delete it.</li></ul>
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<div class="section" id="elb_ug_zs_0004__section45960980171830"><h4 class="sectiontitle">Modifying a Certificate</h4><ol id="elb_ug_zs_0004__ol31851919171830"><li id="elb_ug_zs_0004__li7826457175617">Log in to the management console.</li><li id="elb_ug_zs_0004__li7826185725618">In the upper left corner of the page, click <span><img id="elb_ug_zs_0004__image11255134194313" src="en-us_image_0000001747739624.png"></span> and select the desired region and project.</li><li id="elb_ug_zs_0004__li480743552416">Click <span><img id="elb_ug_zs_0004__image910111439432" src="en-us_image_0000001794660485.png"></span> in the upper left corner to display <strong id="elb_ug_zs_0004__b81011143144311">Service List</strong> and choose <strong id="elb_ug_zs_0004__b13103134311439">Network</strong> &gt; <strong id="elb_ug_zs_0004__b1010417431434">Elastic Load Balancing</strong>.</li><li id="elb_ug_zs_0004__li1716513249584">In the navigation pane on the left, choose <strong id="elb_ug_zs_0004__b187327605312">Certificates</strong>.</li><li id="elb_ug_zs_0004__li49270786171830">Locate the certificate and click <strong id="elb_ug_zs_0004__b8423527061133">Modify</strong> in the <strong id="elb_ug_zs_0004__b1861579079115129">Operation</strong> column.</li><li id="elb_ug_zs_0004__li40783896171830">Modify the parameters as required.</li><li id="elb_ug_zs_0004__li1834242245012">Click <strong id="elb_ug_zs_0004__b84235270611323">OK</strong>.</li></ol>
</div>
<div class="section" id="elb_ug_zs_0004__section8343547171830"><a name="elb_ug_zs_0004__section8343547171830"></a><a name="section8343547171830"></a><h4 class="sectiontitle">Deleting a Certificate</h4><p id="elb_ug_zs_0004__p4738740171830">Only certificates that are not in use can be deleted.</p>
<ol id="elb_ug_zs_0004__ol48293665171830"><li id="elb_ug_zs_0004__li1657144518568">Log in to the management console.</li><li id="elb_ug_zs_0004__li45711945115615">In the upper left corner of the page, click <span><img id="elb_ug_zs_0004__image1496446144318" src="en-us_image_0000001747739624.png"></span> and select the desired region and project.</li><li id="elb_ug_zs_0004__li17301740102218">Click <span><img id="elb_ug_zs_0004__image61201848134313" src="en-us_image_0000001794660485.png"></span> in the upper left corner to display <strong id="elb_ug_zs_0004__b1612110489431">Service List</strong> and choose <strong id="elb_ug_zs_0004__b1312254812435">Network</strong> &gt; <strong id="elb_ug_zs_0004__b18124848124318">Elastic Load Balancing</strong>.</li><li id="elb_ug_zs_0004__li14137175717226">In the navigation pane on the left, choose <strong id="elb_ug_zs_0004__b23131346205215">Certificates</strong>.</li><li id="elb_ug_zs_0004__li25422554171830">Locate the certificate and click <strong id="elb_ug_zs_0004__b339099253">Delete</strong> in the <strong id="elb_ug_zs_0004__b84235270611517">Operation</strong> column.</li><li id="elb_ug_zs_0004__li11740245012">Click <strong id="elb_ug_zs_0004__b2085982482">Yes</strong>.</li></ol>
<ol id="elb_ug_zs_0004__ol48293665171830"><li id="elb_ug_zs_0004__li1657144518568">Log in to the management console.</li><li id="elb_ug_zs_0004__li45711945115615">In the upper left corner of the page, click <span><img id="elb_ug_zs_0004__image1496446144318" src="en-us_image_0000001747739624.png"></span> and select the desired region and project.</li><li id="elb_ug_zs_0004__li17301740102218">Click <span><img id="elb_ug_zs_0004__image61201848134313" src="en-us_image_0000001794660485.png"></span> in the upper left corner to display <strong id="elb_ug_zs_0004__b1612110489431">Service List</strong> and choose <strong id="elb_ug_zs_0004__b1312254812435">Network</strong> &gt; <strong id="elb_ug_zs_0004__b18124848124318">Elastic Load Balancing</strong>.</li><li id="elb_ug_zs_0004__li14137175717226">In the navigation pane on the left, choose <strong id="elb_ug_zs_0004__b23131346205215">Certificates</strong>.</li><li id="elb_ug_zs_0004__li25422554171830">Locate the certificate and click <strong id="elb_ug_zs_0004__b2107095047">Delete</strong> in the <strong id="elb_ug_zs_0004__b84235270611517">Operation</strong> column.</li><li id="elb_ug_zs_0004__li11740245012">Click <strong id="elb_ug_zs_0004__b1082428078">Yes</strong>.</li></ol>
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<h1 class="topictitle1">Querying a Listener by Certificate</h1>
<div id="body1559091467101"><div class="section" id="elb_ug_zs_0006__section15372012143914"><h4 class="sectiontitle">Scenarios</h4><p id="elb_ug_zs_0006__p9618191683916">You need to quickly view details of the listener to which a certificate is bound.</p>
</div>
<div class="section" id="elb_ug_zs_0006__section2692172404117"><h4 class="sectiontitle">Procedure</h4><ol id="elb_ug_zs_0006__ol48293665171830"><li id="elb_ug_zs_0006__li677391520332">Log in to the management console.</li><li id="elb_ug_zs_0006__li675519100420">In the upper left corner of the page, click <span><img id="elb_ug_zs_0006__en-us_topic_0240829509_image1542118117117" src="en-us_image_0000001747739624.png"></span> and select the desired region and project.</li><li id="elb_ug_zs_0006__li83736197297">Hover on <span><img id="elb_ug_zs_0006__en-us_topic_0167652100_image762510132322" src="en-us_image_0000001794660485.png"></span> in the upper left corner to display <strong id="elb_ug_zs_0006__en-us_topic_0167652100_b9121102522212">Service List</strong> and choose <strong id="elb_ug_zs_0006__en-us_topic_0167652100_b61222025142217">Network</strong> &gt; <strong id="elb_ug_zs_0006__en-us_topic_0167652100_b4124425142210">Elastic Load Balancing</strong>. </li><li id="elb_ug_zs_0006__li14137175717226">In the navigation pane on the left, choose <strong id="elb_ug_zs_0006__b104411439537">Certificates</strong>.</li><li id="elb_ug_zs_0006__li25422554171830">In the certificate list, click the listener name in the <strong id="elb_ug_zs_0006__b1382613167515">Listener (Frontend Protocol/Port)</strong> column to view its details.<p id="elb_ug_zs_0006__p188787579465">If there are more than 5 listeners, no listener is displayed in the <strong id="elb_ug_zs_0006__b589210513211">Listener (Frontend Protocol/Port)</strong> column. Click <strong id="elb_ug_zs_0006__b4901124766">View All</strong>. On the displayed page, click <strong id="elb_ug_zs_0006__b1729612311337">Listeners</strong>, locate the listener, and click its name to view it details.</p>
<div class="section" id="elb_ug_zs_0006__section2692172404117"><h4 class="sectiontitle">Procedure</h4><ol id="elb_ug_zs_0006__ol48293665171830"><li id="elb_ug_zs_0006__li677391520332">Log in to the management console.</li><li id="elb_ug_zs_0006__li675519100420">In the upper left corner of the page, click <span><img id="elb_ug_zs_0006__image109723826211836" src="en-us_image_0000001747739624.png"></span> and select the desired region and project.</li><li id="elb_ug_zs_0006__li83736197297">Click <span><img id="elb_ug_zs_0006__image82047330111723" src="en-us_image_0000001794660485.png"></span> in the upper left corner to display <strong id="elb_ug_zs_0006__b37162012611723">Service List</strong> and choose <strong id="elb_ug_zs_0006__b88707487611723">Network</strong> &gt; <strong id="elb_ug_zs_0006__b179920355811723">Elastic Load Balancing</strong>.</li><li id="elb_ug_zs_0006__li14137175717226">In the navigation pane on the left, choose <strong id="elb_ug_zs_0006__b104411439537">Certificates</strong>.</li><li id="elb_ug_zs_0006__li25422554171830">In the certificate list, click the listener name in the <strong id="elb_ug_zs_0006__b1382613167515">Listener (Frontend Protocol/Port)</strong> column to view its details.<p id="elb_ug_zs_0006__p188787579465">If there are more than 5 listeners, no listener is displayed in the <strong id="elb_ug_zs_0006__b589210513211">Listener (Frontend Protocol/Port)</strong> column. Click <strong id="elb_ug_zs_0006__b4901124766">View All</strong>. On the displayed page, click <strong id="elb_ug_zs_0006__b1729612311337">Listeners</strong>, locate the listener, and click its name to view it details.</p>
</li></ol>
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<a name="EN-US_TOPIC_0000001794660385"></a><a name="EN-US_TOPIC_0000001794660385"></a>
<h1 class="topictitle1">Transfer Client IP Address (Dedicated Load Balancers)</h1>
<div id="body0000001572743802"><div class="section" id="EN-US_TOPIC_0000001794660385__section6803813885"><h4 class="sectiontitle">Transfer Client IP Address</h4><p id="EN-US_TOPIC_0000001794660385__p0550141720811">If you enable <strong id="EN-US_TOPIC_0000001794660385__b38778204324">Transfer Client IP Address</strong>, your load balancer will use the IP address of the client to access the backend server.</p>
<div id="body0000001572743802"><div class="section" id="EN-US_TOPIC_0000001794660385__section6803813885"><h4 class="sectiontitle">Transfer Client IP Address</h4><p id="EN-US_TOPIC_0000001794660385__p0550141720811">If you enable <strong id="EN-US_TOPIC_0000001794660385__b33921735141010">Transfer Client IP Address</strong>, your load balancer will use the IP address of the client to access the backend server.</p>
<p id="EN-US_TOPIC_0000001794660385__p105830292017"><a href="#EN-US_TOPIC_0000001794660385__table167041254114314">Table 1</a> lists whether you can enable or disable the transfer client IP address function.</p>
<div class="tablenoborder"><a name="EN-US_TOPIC_0000001794660385__table167041254114314"></a><a name="table167041254114314"></a><table cellpadding="4" cellspacing="0" summary="" id="EN-US_TOPIC_0000001794660385__table167041254114314" frame="border" border="1" rules="all"><caption><b>Table 1 </b>Transfer client IP address</caption><thead align="left"><tr id="EN-US_TOPIC_0000001794660385__row177041754204310"><th align="left" class="cellrowborder" valign="top" width="32.81%" id="mcps1.3.1.4.2.4.1.1"><p id="EN-US_TOPIC_0000001794660385__p1949915348446">Listener Type</p>
@ -30,7 +30,7 @@
</table>
</div>
</div>
<div class="section" id="EN-US_TOPIC_0000001794660385__section12113203814316"><h4 class="sectiontitle">Constraints</h4><ul id="EN-US_TOPIC_0000001794660385__ul2816155113112"><li id="EN-US_TOPIC_0000001794660385__li1769817119268">If you enable <strong id="EN-US_TOPIC_0000001794660385__b15212518194815">Transfer Client IP Address</strong>, a server cannot be used as both the client and the backend server.<p id="EN-US_TOPIC_0000001794660385__p99071156260">If the client and the backend server are using the same server and the <strong id="EN-US_TOPIC_0000001794660385__b154704990524041">Transfer Client IP Address</strong> option is enabled, the backend server will think the packet is sent by itself but not from the client and will not return a response packet to the load balancer. As a result, the return traffic will be interrupted.</p>
<div class="section" id="EN-US_TOPIC_0000001794660385__section12113203814316"><h4 class="sectiontitle">Constraints</h4><ul id="EN-US_TOPIC_0000001794660385__ul2816155113112"><li id="EN-US_TOPIC_0000001794660385__li1769817119268">If you enable <strong id="EN-US_TOPIC_0000001794660385__b1818955671011">Transfer Client IP Address</strong>, a server cannot serve as both a backend server and a client.<p id="EN-US_TOPIC_0000001794660385__p99071156260">If the client and the backend server are using the same server and the <strong id="EN-US_TOPIC_0000001794660385__b154704990524041">Transfer Client IP Address</strong> option is enabled, the backend server will think the packet is sent by itself but not from the client and will not return a response packet to the load balancer. As a result, the return traffic will be interrupted.</p>
</li><li id="EN-US_TOPIC_0000001794660385__li15335204823216">After this function is enabled, unidirectional download or push traffic may be interrupted when backend servers are being migrated. After the backend servers are migrated, retransmit the packets to restore the traffic.</li><li id="EN-US_TOPIC_0000001794660385__li13559104513310">If you add IP addresses as backend servers, the source IP addresses of the clients cannot be passed to these servers. </li></ul>
</div>
<div class="section" id="EN-US_TOPIC_0000001794660385__section205214134198"><h4 class="sectiontitle">Alternatives for Obtaining the IP Address of the Client</h4><p id="EN-US_TOPIC_0000001794660385__p294152220196">You can obtain the IP address of a client in one of the ways listed in <a href="#EN-US_TOPIC_0000001794660385__table640304414221">Table 2</a>.</p>

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<a name="en-us_topic_0015479966"></a><a name="en-us_topic_0015479966"></a>
<h1 class="topictitle1">What Is ELB?</h1>
<div id="body1515498115413"><p id="en-us_topic_0015479966__p155161438811">Elastic Load Balancing (ELB) automatically distributes incoming traffic across multiple backend servers based on the listening rules you configure. ELB expands the service capabilities of your applications and improves their availability by eliminating single points of failure (SPOFs).</p>
<div id="body1515498115413"><p id="en-us_topic_0015479966__p155161438811">Elastic Load Balancing (ELB) automatically distributes incoming traffic across multiple backend <span id="en-us_topic_0015479966__text651633810110">server</span>s based on the listening rules you configure. ELB expands the service capabilities of your applications and improves their availability by eliminating single points of failure (SPOFs).</p>
<p id="en-us_topic_0015479966__p21426294174751">As shown in the example in the following figure, ELB distributes incoming traffic to three application servers, and each server processes one third of the requests. ELB also provides health checks, which can detect unhealthy servers. Traffic is distributed only to servers that are running normally, improving the availability of applications.</p>
<div class="fignone" id="en-us_topic_0015479966__fig1213118532148"><span class="figcap"><b>Figure 1 </b>Using a load balancer</span><br><span><img class="vsd" id="en-us_topic_0015479966__image413115361413" src="en-us_image_0000001747381220.png"></span></div>
<div class="section" id="en-us_topic_0015479966__section031725010213"><a name="en-us_topic_0015479966__section031725010213"></a><a name="section031725010213"></a><h4 class="sectiontitle">ELB Components</h4><p id="en-us_topic_0015479966__p5191164432114">ELB consists of the following components:</p>
<ul id="en-us_topic_0015479966__ul3441162342"><li id="en-us_topic_0015479966__li13225125413234">Load balancer: distributes incoming traffic across backend servers in one or more availability zones (AZs).</li><li id="en-us_topic_0015479966__li154418614342">Listener: uses the protocol and port you specify to check for requests from clients and route the requests to associated backend servers based on the listening rules and forwarding policies you configure. You can add one or more listeners to a load balancer.</li><li id="en-us_topic_0015479966__li194371355">Backend server group: contains one or more backend servers to receive requests routed by the listener. You need to add at least one backend server to a backend server group.<p id="en-us_topic_0015479966__p68121737152213"><a name="en-us_topic_0015479966__li194371355"></a><a name="li194371355"></a>You can set a weight for each backend server based on their performance.</p>
<p id="en-us_topic_0015479966__p53218810368">You can also configure health checks for a backend server group to check the health of each backend <span id="en-us_topic_0015479966__text19376251166">server</span>. When a backend <span id="en-us_topic_0015479966__text5315720579">server</span> is unhealthy, the load balancer stops routing new requests to this <span id="en-us_topic_0015479966__text7578182983418">server</span>.</p>
<ul id="en-us_topic_0015479966__ul3441162342"><li id="en-us_topic_0015479966__li13225125413234">A load balancer distributes incoming traffic across multiple backend servers in one or more AZs.</li><li id="en-us_topic_0015479966__li154418614342">A listener uses the protocol and port you specify to check requests from clients and route the requests to associated backend servers based on the routing policies and forwarding policies you configure. You can add one or more listeners to a load balancer.</li><li id="en-us_topic_0015479966__li194371355">A backend server group uses the protocol and port you specify to receive the requests from the load balancer and route them to one or more backend servers. You need to add at least one backend server to a backend server group.<p id="en-us_topic_0015479966__p68121737152213"><a name="en-us_topic_0015479966__li194371355"></a><a name="li194371355"></a>You can set a weight for each backend server based on their performance.</p>
<p id="en-us_topic_0015479966__p53218810368">You can also configure health checks for a backend server group to check the health of each backend <span id="en-us_topic_0015479966__text19376251166">server</span>. When a backend server is unhealthy, the load balancer stops routing new requests to it.</p>
</li></ul>
</div>
<div class="fignone" id="en-us_topic_0015479966__fig247417253010"><span class="figcap"><b>Figure 2 </b>ELB components</span><br><span><img id="en-us_topic_0015479966__image18717506348" src="en-us_image_0000001794820049.png"></span></div>
<div class="section" id="en-us_topic_0015479966__section207361012122212"><h4 class="sectiontitle">Load Balancer Types</h4><p id="en-us_topic_0015479966__p1914416561296">ELB provides <span id="en-us_topic_0015479966__ph1682355512423">shared</span> load balancers and dedicated load balancers.</p>
<div class="section" id="en-us_topic_0015479966__section207361012122212"><h4 class="sectiontitle">Load Balancer Types</h4><p id="en-us_topic_0015479966__p1914416561296">ELB provides dedicated load balancers<span id="en-us_topic_0015479966__ph34977345260"> and shared load balancers</span>.</p>
<div class="fignone" id="en-us_topic_0015479966__fig163621835133612"><span class="figcap"><b>Figure 3 </b>Load balancer types</span><br><span><img id="en-us_topic_0015479966__image183621435153611" src="en-us_image_0000001794660965.png"></span></div>
<ul id="en-us_topic_0015479966__ul12641111520119"><li id="en-us_topic_0015479966__li2598204262615">Dedicated load balancers have exclusive use of underlying resources, so that the performance of a dedicated load balancer is not affected by other load balancers. In addition, there are a wide range of specifications available for selection.</li></ul>
<div class="note" id="en-us_topic_0015479966__note88206513368"><img src="public_sys-resources/note_3.0-en-us.png"><span class="notetitle"> </span><div class="notebody"><ul id="en-us_topic_0015479966__en-us_topic_0242751126_ul149561817144915"><li id="en-us_topic_0015479966__en-us_topic_0242751126_li895681714492">In the eu-de region, you can create both dedicated and shared load balancers, and you can create either type of load balancers on the management console or by calling APIs.</li><li id="en-us_topic_0015479966__en-us_topic_0242751126_li0284142520492">In the eu-nl region, you can only create dedicated load balancers, either on the console or by calling APIs.</li></ul>
</div></div>
<ul id="en-us_topic_0015479966__ul4956122720526"><li id="en-us_topic_0015479966__li1434419205316"><span id="en-us_topic_0015479966__ph15170164618279">Shared</span> load balancers are deployed in clusters and share underlying resources, so that the performance of a load balancer is affected by other load balancers. <span id="en-us_topic_0015479966__ph109384831912">Shared load balancers were previously named enhanced load balancers.</span></li></ul>
<ul id="en-us_topic_0015479966__ul4956122720526"><li id="en-us_topic_0015479966__li1434419205316"><span id="en-us_topic_0015479966__ph15170164618279">Shared</span> load balancers are deployed in clusters. They share underlying resources, so the performance of a load balancer is affected by other load balancers. <span id="en-us_topic_0015479966__ph109384831912">Shared load balancers were previously named enhanced load balancers.</span></li></ul>
<p id="en-us_topic_0015479966__p1965110261438">For details about the differences between dedicated and shared load balancers, see <a href="elb_pro_0004.html">Differences Between Dedicated and Shared Load Balancers</a>.</p>
</div>
<div class="section" id="en-us_topic_0015479966__section17818164132517"><a name="en-us_topic_0015479966__section17818164132517"></a><a name="section17818164132517"></a><h4 class="sectiontitle">Accessing ELB</h4><p id="en-us_topic_0015479966__p176220543351">You can use either of the following methods to access ELB:</p>

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</th>
<th align="left" class="cellrowborder" valign="top" width="54.58%" id="mcps1.3.3.2.5.2.2.4.1.2"><p id="en-us_topic_0015479967__p1783611487241">Description</p>
</th>
<th align="left" class="cellrowborder" valign="top" width="26.85%" id="mcps1.3.3.2.5.2.2.4.1.3"><p id="en-us_topic_0015479967__p138361848122413"><strong id="en-us_topic_0015479967__b352693684">Example Value</strong></p>
<th align="left" class="cellrowborder" valign="top" width="26.85%" id="mcps1.3.3.2.5.2.2.4.1.3"><p id="en-us_topic_0015479967__p138361848122413"><strong id="en-us_topic_0015479967__b2110587358">Example Value</strong></p>
</th>
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</div></div>
</div>
<div class="section" id="en-us_topic_0018127975__section10449191315558"><a name="en-us_topic_0018127975__section10449191315558"></a><a name="section10449191315558"></a><h4 class="sectiontitle">Checking the Health Check Configuration</h4><p id="en-us_topic_0018127975__p5450913175518">For a dedicated or shared load balancer, click the name of the load balancer to view its details. Navigate to <strong id="en-us_topic_0018127975__b1346164105212">Backend Server Groups</strong> and then click the name of the server group. In the <strong id="en-us_topic_0018127975__b14568111165216">Basic Information</strong> area, to the right of <strong id="en-us_topic_0018127975__b77271418145212">Health Check</strong>, click <strong id="en-us_topic_0018127975__b5881120175220">Configure</strong>. Check the following parameters:</p>
<div class="p" id="en-us_topic_0018127975__p20450513175519"><ul id="en-us_topic_0018127975__ul174507131556"><li id="en-us_topic_0018127975__li1845041375511"><strong id="en-us_topic_0018127975__b1068611388251">Heath Check Protocol</strong>: The protocol used for health checks.</li><li id="en-us_topic_0018127975__li1745061325516"><strong id="en-us_topic_0018127975__b12267154482515">Heath Check Port</strong>: The port must be the one used on the backend server, and it cannot be changed. Check whether the health check port is in the listening state on the backend server. If the health check port is not in the listening state on the backend server, the backend server will be identified as unhealthy.</li><li id="en-us_topic_0018127975__li114504135556"><strong id="en-us_topic_0018127975__b11657150112611">Path</strong>: If HTTP is used for health checks, you must check this parameter. A simple static HTML file is recommended.</li></ul>
<div class="p" id="en-us_topic_0018127975__p20450513175519"><ul id="en-us_topic_0018127975__ul174507131556"><li id="en-us_topic_0018127975__li1845041375511"><strong id="en-us_topic_0018127975__b1068611388251">Health Check Protocol</strong>: The protocol used for health checks.</li><li id="en-us_topic_0018127975__li1745061325516"><strong id="en-us_topic_0018127975__b12267154482515">Health Check Port</strong>: The port must be the one used on the backend server, and it cannot be changed. Check whether the health check port is in the listening state on the backend server. If the health check port is not in the listening state on the backend server, the backend server will be identified as unhealthy.</li><li id="en-us_topic_0018127975__li114504135556"><strong id="en-us_topic_0018127975__b11657150112611">Path</strong>: If HTTP is used for health checks, you must check this parameter. A simple static HTML file is recommended.</li></ul>
</div>
<div class="note" id="en-us_topic_0018127975__note2082712133712"><img src="public_sys-resources/note_3.0-en-us.png"><span class="notetitle"> </span><div class="notebody"><ul id="en-us_topic_0018127975__ul17862515174013"><li id="en-us_topic_0018127975__li48621915184011">If the health check protocol is HTTP, the port and the path are used for health checks.</li><li id="en-us_topic_0018127975__li1030810382401">If the health check protocol is TCP, only the port is used for health checks.</li><li id="en-us_topic_0018127975__li1893641784111">If health check protocol is HTTP and the health check port is normal, change the path or change the health check protocol to TCP.</li><li id="en-us_topic_0018127975__li131244162619">Enter an absolute path.<p id="en-us_topic_0018127975__p543012419614"><a name="en-us_topic_0018127975__li131244162619"></a><a name="li131244162619"></a>For example:</p>
<p id="en-us_topic_0018127975__p177612052141613">If the URL is <strong id="en-us_topic_0018127975__b1349515472458">http://www.example.com</strong> or <strong id="en-us_topic_0018127975__b32411515450">http://192.168.63.187:9096</strong>, enter <strong id="en-us_topic_0018127975__b3261282466">/</strong> as the health check path. </p>
@ -106,7 +106,7 @@
</li></ul>
</div></div>
</div>
<div class="section" id="en-us_topic_0018127975__section2948957185917"><a name="en-us_topic_0018127975__section2948957185917"></a><a name="section2948957185917"></a><h4 class="sectiontitle">Checking Security Group Rules</h4><ul id="en-us_topic_0018127975__ul3162105921417"><li id="en-us_topic_0018127975__li111621159191410"><strong id="en-us_topic_0018127975__b20573121772519">Dedicated Load balancers</strong><ul id="en-us_topic_0018127975__ul20283154485015"><li id="en-us_topic_0018127975__li1743125315011"><strong id="en-us_topic_0018127975__b149481127111">TCP, HTTP, or HTTPS listeners</strong>: Verify that the inbound security group rule allows TCP traffic from the VPC where the dedicated load balancer resides to the backend server over the health check port.<ul id="en-us_topic_0018127975__ul98748772214"><li id="en-us_topic_0018127975__li787415702212">If the health check port is the same as the backend port, the inbound rule must allow traffic over the backend port, for example, port 80.</li><li id="en-us_topic_0018127975__li587457152210">If the port (port 80 as an example) for health check is different from that used by the backend server (port 443 as an example), inbound security group rules must allow traffic over both ports.<div class="note" id="en-us_topic_0018127975__note1387412711224"><img src="public_sys-resources/note_3.0-en-us.png"><span class="notetitle"> </span><div class="notebody"><p id="en-us_topic_0018127975__p187415715228">You can check the protocol and port in the <strong id="en-us_topic_0018127975__b1521927726">Basic Information</strong> area of the backend server group.</p>
<div class="section" id="en-us_topic_0018127975__section2948957185917"><a name="en-us_topic_0018127975__section2948957185917"></a><a name="section2948957185917"></a><h4 class="sectiontitle">Checking Security Group Rules</h4><ul id="en-us_topic_0018127975__ul3162105921417"><li id="en-us_topic_0018127975__li111621159191410"><strong id="en-us_topic_0018127975__b20573121772519">Dedicated Load balancers</strong><ul id="en-us_topic_0018127975__ul20283154485015"><li id="en-us_topic_0018127975__li1743125315011"><strong id="en-us_topic_0018127975__b149481127111">TCP, HTTP, or HTTPS listeners</strong>: Verify that the inbound security group rule allows TCP traffic from the VPC where the dedicated load balancer resides to the backend server over the health check port.<ul id="en-us_topic_0018127975__ul98748772214"><li id="en-us_topic_0018127975__li787415702212">If the health check port is the same as the backend port, the inbound rule must allow traffic over the backend port, for example, port 80.</li><li id="en-us_topic_0018127975__li587457152210">If the port (port 80 as an example) for health check is different from that used by the backend server (port 443 as an example), inbound security group rules must allow traffic over both ports.<div class="note" id="en-us_topic_0018127975__note1387412711224"><img src="public_sys-resources/note_3.0-en-us.png"><span class="notetitle"> </span><div class="notebody"><p id="en-us_topic_0018127975__p187415715228">You can check the protocol and port in the <strong id="en-us_topic_0018127975__b1347978914">Basic Information</strong> area of the backend server group.</p>
</div></div>
</li></ul>
<div class="fignone" id="en-us_topic_0018127975__fig128747713229"><span class="figcap"><b>Figure 2 </b>Example inbound rule</span><br><span><img id="en-us_topic_0018127975__image188744720224" src="en-us_image_0000001747381004.png"></span></div>

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@ -12,7 +12,7 @@
<div class="caution" id="en-us_topic_0114694934__note113071840142519"><span class="cautiontitle"><img src="public_sys-resources/caution_3.0-en-us.png"> </span><div class="cautionbody"><p id="en-us_topic_0114694934__p20307140122519">If you add a forwarding policy that is the same as an existing one by calling APIs, there will be a conflict. Even if you delete the existing forwarding policy, the new forwarding policy is still faulty. Delete the newly-added forwarding policy and add a different one.</p>
</div></div>
</div>
<div class="section" id="en-us_topic_0114694934__section191183222317"><h4 class="sectiontitle">Adding a Forwarding Policy</h4><ol id="en-us_topic_0114694934__ol316810121211"><li id="en-us_topic_0114694934__li677391520332">Log in to the management console.</li><li id="en-us_topic_0114694934__li675519100420">In the upper left corner of the page, click <span><img id="en-us_topic_0114694934__en-us_topic_0240829509_image1542118117117" src="en-us_image_0000001747739624.png"></span> and select the desired region and project.</li><li id="en-us_topic_0114694934__li83736197297">Hover on <span><img id="en-us_topic_0114694934__en-us_topic_0167652100_image762510132322" src="en-us_image_0000001794660485.png"></span> in the upper left corner to display <strong id="en-us_topic_0114694934__en-us_topic_0167652100_b9121102522212">Service List</strong> and choose <strong id="en-us_topic_0114694934__en-us_topic_0167652100_b61222025142217">Network</strong> &gt; <strong id="en-us_topic_0114694934__en-us_topic_0167652100_b4124425142210">Elastic Load Balancing</strong>. </li><li id="en-us_topic_0114694934__li191687112127">Locate the load balancer and click its name.</li><li id="en-us_topic_0114694934__li781950135113">Click <strong id="en-us_topic_0114694934__b842352706153131">Listeners</strong>, locate the listener, and click its name.</li><li id="en-us_topic_0114694934__li189932653215">Click <span><img id="en-us_topic_0114694934__image0469315335" src="en-us_image_0000001794660873.png"></span> on the right of the listener name and select <strong id="en-us_topic_0114694934__b42962644410">Configure Forwarding Policy</strong>.<p id="en-us_topic_0114694934__p194821453163420">Alternatively, click <strong id="en-us_topic_0114694934__b19221401448">Forwarding Policies</strong> on the right of the page.</p>
<div class="section" id="en-us_topic_0114694934__section191183222317"><h4 class="sectiontitle">Adding a Forwarding Policy</h4><ol id="en-us_topic_0114694934__ol316810121211"><li id="en-us_topic_0114694934__li677391520332">Log in to the management console.</li><li id="en-us_topic_0114694934__li675519100420">In the upper left corner of the page, click <span><img id="en-us_topic_0114694934__image175570837111830" src="en-us_image_0000001747739624.png"></span> and select the desired region and project.</li><li id="en-us_topic_0114694934__li83736197297">Click <span><img id="en-us_topic_0114694934__image207060097211710" src="en-us_image_0000001794660485.png"></span> in the upper left corner to display <strong id="en-us_topic_0114694934__b205892662211710">Service List</strong> and choose <strong id="en-us_topic_0114694934__b204277483411710">Network</strong> &gt; <strong id="en-us_topic_0114694934__b20254166111710">Elastic Load Balancing</strong>.</li><li id="en-us_topic_0114694934__li191687112127">Locate the load balancer and click its name.</li><li id="en-us_topic_0114694934__li781950135113">Click <strong id="en-us_topic_0114694934__b842352706153131">Listeners</strong>, locate the listener, and click its name.</li><li id="en-us_topic_0114694934__li189932653215">Click <span><img id="en-us_topic_0114694934__image0469315335" src="en-us_image_0000001794660873.png"></span> on the right of the listener name and select <strong id="en-us_topic_0114694934__b42962644410">Configure Forwarding Policy</strong>.<p id="en-us_topic_0114694934__p194821453163420">Alternatively, click <strong id="en-us_topic_0114694934__b19221401448">Forwarding Policies</strong> on the right of the page.</p>
</li><li id="en-us_topic_0114694934__li13031942302">On the <strong id="en-us_topic_0114694934__b217032418617">Forwarding Policies</strong> tab page, click <strong id="en-us_topic_0114694934__b01716241062">Add Forwarding Policy</strong>.<p id="en-us_topic_0114694934__p698011471114">Configure the parameters based on <a href="#en-us_topic_0114694934__table17349191491714">Table 1</a>.</p>
</li><li id="en-us_topic_0114694934__en-us_topic_0000001168961119_en-us_topic_0000001127292335_li9629179153817">After the configuration is complete, click <strong id="en-us_topic_0114694934__b15767173918613">Save</strong>.</li></ol>
@ -96,9 +96,9 @@
</th>
</tr>
</thead>
<tbody><tr id="en-us_topic_0114694934__row1289643195912"><td class="cellrowborder" valign="top" width="19.69393878775755%" headers="mcps1.3.5.2.7.1.1 "><p id="en-us_topic_0114694934__p17134761873">N/A</p>
<tbody><tr id="en-us_topic_0114694934__row1289643195912"><td class="cellrowborder" valign="top" width="15.933186637327465%" headers="mcps1.3.5.2.7.1.1 "><p id="en-us_topic_0114694934__p17134761873">N/A</p>
</td>
<td class="cellrowborder" valign="top" width="15.053010602120423%" headers="mcps1.3.5.2.7.1.2 "><p id="en-us_topic_0114694934__p17134567713">N/A</p>
<td class="cellrowborder" valign="top" width="18.81376275255051%" headers="mcps1.3.5.2.7.1.2 "><p id="en-us_topic_0114694934__p17134567713">N/A</p>
</td>
<td class="cellrowborder" valign="top" width="16.313262652530504%" headers="mcps1.3.5.2.7.1.3 "><p id="en-us_topic_0114694934__p1089663175919">/elb/index.html</p>
</td>
@ -109,9 +109,9 @@
<td class="cellrowborder" valign="top" width="16.313262652530504%" headers="mcps1.3.5.2.7.1.3 "><p id="en-us_topic_0114694934__p3896731205919">/index.html</p>
</td>
</tr>
<tr id="en-us_topic_0114694934__row2896103116597"><td class="cellrowborder" valign="top" width="19.69393878775755%" headers="mcps1.3.5.2.7.1.1 "><p id="en-us_topic_0114694934__p1689783116593">Exact match</p>
<tr id="en-us_topic_0114694934__row2896103116597"><td class="cellrowborder" valign="top" width="15.933186637327465%" headers="mcps1.3.5.2.7.1.1 "><p id="en-us_topic_0114694934__p1689783116593">Exact match</p>
</td>
<td class="cellrowborder" rowspan="3" valign="top" width="15.053010602120423%" headers="mcps1.3.5.2.7.1.2 "><p id="en-us_topic_0114694934__p118978317599">/elb/index.html</p>
<td class="cellrowborder" rowspan="3" valign="top" width="18.81376275255051%" headers="mcps1.3.5.2.7.1.2 "><p id="en-us_topic_0114694934__p118978317599">/elb/index.html</p>
</td>
<td class="cellrowborder" valign="top" width="16.313262652530504%" headers="mcps1.3.5.2.7.1.3 "><p id="en-us_topic_0114694934__p38975312592"></p>
</td>
@ -149,10 +149,10 @@
</div>
<div class="fignone" id="en-us_topic_0114694934__fig87121434403"><a name="en-us_topic_0114694934__fig87121434403"></a><a name="fig87121434403"></a><span class="figcap"><b>Figure 1 </b>Request forwarding</span><br><span><img id="en-us_topic_0114694934__image12237718166" src="en-us_image_0000001747740012.jpg"></span></div>
<p id="en-us_topic_0114694934__p50124043202039">In this figure, the system first searches for an exact match of the requested URL (/elb_gls/glossary.html). If there is no exact match, the system searches for a prefix match. If a match is found, the request is forwarded to backend server group 2 even if a regular expression match is also found, because the prefix match has a higher priority.</p>
<div class="section" id="en-us_topic_0114694934__section0239201242216"><h4 class="sectiontitle">Modifying a Forwarding Policy</h4><ol id="en-us_topic_0114694934__ol648102516228"><li id="en-us_topic_0114694934__li1348514094915">Log in to the management console.</li><li id="en-us_topic_0114694934__li2485180174918">In the upper left corner of the page, click <span><img id="en-us_topic_0114694934__en-us_topic_0240829509_image1542118117117_1" src="en-us_image_0000001747739624.png"></span> and select the desired region and project.</li><li id="en-us_topic_0114694934__li17301740102218">Hover on <span><img id="en-us_topic_0114694934__en-us_topic_0167652100_image762510132322_1" src="en-us_image_0000001794660485.png"></span> in the upper left corner to display <strong id="en-us_topic_0114694934__en-us_topic_0167652100_b9121102522212_1">Service List</strong> and choose <strong id="en-us_topic_0114694934__en-us_topic_0167652100_b61222025142217_1">Network</strong> &gt; <strong id="en-us_topic_0114694934__en-us_topic_0167652100_b4124425142210_1">Elastic Load Balancing</strong>. </li><li id="en-us_topic_0114694934__li149225122216">Locate the load balancer and click its name.</li><li id="en-us_topic_0114694934__li349122516225">Click <strong id="en-us_topic_0114694934__b842352706163816">Listeners</strong>, locate the listener, and click its name.</li><li id="en-us_topic_0114694934__li15302102762418">Click <span><img id="en-us_topic_0114694934__image146261387359" src="en-us_image_0000001794819961.png"></span> on the right of the listener name and select <strong id="en-us_topic_0114694934__b143691643961">Configure Forwarding Policy</strong>.<p id="en-us_topic_0114694934__p19626113843512">Alternatively, click <strong id="en-us_topic_0114694934__b817075214615">Forwarding Policies</strong> in the right pane.</p>
<div class="section" id="en-us_topic_0114694934__section0239201242216"><h4 class="sectiontitle">Modifying a Forwarding Policy</h4><ol id="en-us_topic_0114694934__ol648102516228"><li id="en-us_topic_0114694934__li1348514094915">Log in to the management console.</li><li id="en-us_topic_0114694934__li2485180174918">In the upper left corner of the page, click <span><img id="en-us_topic_0114694934__image113594470311830" src="en-us_image_0000001747739624.png"></span> and select the desired region and project.</li><li id="en-us_topic_0114694934__li17301740102218">Click <span><img id="en-us_topic_0114694934__image72278225811710" src="en-us_image_0000001794660485.png"></span> in the upper left corner to display <strong id="en-us_topic_0114694934__b114821046411710">Service List</strong> and choose <strong id="en-us_topic_0114694934__b97920351311710">Network</strong> &gt; <strong id="en-us_topic_0114694934__b58124212211710">Elastic Load Balancing</strong>.</li><li id="en-us_topic_0114694934__li149225122216">Locate the load balancer and click its name.</li><li id="en-us_topic_0114694934__li349122516225">Click <strong id="en-us_topic_0114694934__b842352706163816">Listeners</strong>, locate the listener, and click its name.</li><li id="en-us_topic_0114694934__li15302102762418">Click <span><img id="en-us_topic_0114694934__image146261387359" src="en-us_image_0000001794819961.png"></span> on the right of the listener name and select <strong id="en-us_topic_0114694934__b143691643961">Configure Forwarding Policy</strong>.<p id="en-us_topic_0114694934__p19626113843512">Alternatively, click <strong id="en-us_topic_0114694934__b817075214615">Forwarding Policies</strong> in the right pane.</p>
</li><li id="en-us_topic_0114694934__li106261638163519">On the <strong id="en-us_topic_0114694934__b6658155518618">Forwarding Policies</strong> tab page, select the forwarding policy you want to modify and click <strong id="en-us_topic_0114694934__b06608553618">Edit</strong>.</li><li id="en-us_topic_0114694934__li11891113592816">Modify the parameters and click <strong id="en-us_topic_0114694934__b16565135818612">Save</strong>.</li></ol>
</div>
<div class="section" id="en-us_topic_0114694934__section4306132117396"><a name="en-us_topic_0114694934__section4306132117396"></a><a name="section4306132117396"></a><h4 class="sectiontitle">Deleting a Forwarding Policy</h4><ol id="en-us_topic_0114694934__ol118712153583"><li id="en-us_topic_0114694934__li2071031219497">Log in to the management console.</li><li id="en-us_topic_0114694934__li2710161212497">In the upper left corner of the page, click <span><img id="en-us_topic_0114694934__en-us_topic_0240829509_image1542118117117_2" src="en-us_image_0000001747739624.png"></span> and select the desired region and project.</li><li id="en-us_topic_0114694934__li1974332122111">Hover on <span><img id="en-us_topic_0114694934__en-us_topic_0167652100_image762510132322_2" src="en-us_image_0000001794660485.png"></span> in the upper left corner to display <strong id="en-us_topic_0114694934__en-us_topic_0167652100_b9121102522212_2">Service List</strong> and choose <strong id="en-us_topic_0114694934__en-us_topic_0167652100_b61222025142217_2">Network</strong> &gt; <strong id="en-us_topic_0114694934__en-us_topic_0167652100_b4124425142210_2">Elastic Load Balancing</strong>. </li><li id="en-us_topic_0114694934__li2341383911">Locate the load balancer and click its name.</li><li id="en-us_topic_0114694934__li2651933153113">Click <strong id="en-us_topic_0114694934__b1479313712">Listeners</strong>, locate the listener, and click its name.</li><li id="en-us_topic_0114694934__li209701315123814">Click <span><img id="en-us_topic_0114694934__image1297012150389" src="en-us_image_0000001794819965.png"></span> on the right of the listener name and select <strong id="en-us_topic_0114694934__b3877201275">Configure Forwarding Policy</strong>.<p id="en-us_topic_0114694934__p597015157388">Alternatively, click <strong id="en-us_topic_0114694934__b722119101974">Forwarding Policies</strong> in the right pane.</p>
<div class="section" id="en-us_topic_0114694934__section4306132117396"><a name="en-us_topic_0114694934__section4306132117396"></a><a name="section4306132117396"></a><h4 class="sectiontitle">Deleting a Forwarding Policy</h4><ol id="en-us_topic_0114694934__ol118712153583"><li id="en-us_topic_0114694934__li2071031219497">Log in to the management console.</li><li id="en-us_topic_0114694934__li2710161212497">In the upper left corner of the page, click <span><img id="en-us_topic_0114694934__image42339641511830" src="en-us_image_0000001747739624.png"></span> and select the desired region and project.</li><li id="en-us_topic_0114694934__li1974332122111">Click <span><img id="en-us_topic_0114694934__image130943878911710" src="en-us_image_0000001794660485.png"></span> in the upper left corner to display <strong id="en-us_topic_0114694934__b92218954311710">Service List</strong> and choose <strong id="en-us_topic_0114694934__b127280929211710">Network</strong> &gt; <strong id="en-us_topic_0114694934__b116744304511710">Elastic Load Balancing</strong>.</li><li id="en-us_topic_0114694934__li2341383911">Locate the load balancer and click its name.</li><li id="en-us_topic_0114694934__li2651933153113">Click <strong id="en-us_topic_0114694934__b898674750">Listeners</strong>, locate the listener, and click its name.</li><li id="en-us_topic_0114694934__li209701315123814">Click <span><img id="en-us_topic_0114694934__image1297012150389" src="en-us_image_0000001794819965.png"></span> on the right of the listener name and select <strong id="en-us_topic_0114694934__b3877201275">Configure Forwarding Policy</strong>.<p id="en-us_topic_0114694934__p597015157388">Alternatively, click <strong id="en-us_topic_0114694934__b722119101974">Forwarding Policies</strong> in the right pane.</p>
</li><li id="en-us_topic_0114694934__li297001513387">On the <strong id="en-us_topic_0114694934__b158910141672">Forwarding Policies</strong> tab page, select the forwarding policy you want to delete and click <strong id="en-us_topic_0114694934__b1991141415710">Delete</strong>.</li><li id="en-us_topic_0114694934__li1353838293">In the displayed dialog box, click <strong id="en-us_topic_0114694934__b189111235104714">Yes</strong>.</li></ol>
</div>
</div>

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@ -5,11 +5,11 @@
<p id="en-us_topic_0118147668__p735913619321">Load balancer EIPs are placed in the X-Forwarded-ELB-IP field in the HTTPS or HTTP header in the format of <em id="en-us_topic_0118147668__i938143317151">XX.XXX.XX.XXX</em>, as shown below:</p>
<pre class="screen" id="en-us_topic_0118147668__screen1096362316322">X-Forwarded-ELB-IP: XX.XXX.XX.XXX</pre>
</div>
<div class="section" id="en-us_topic_0118147668__section923919121192"><h4 class="sectiontitle">Enabling the Function</h4><ol id="en-us_topic_0118147668__ol12927248891"><li id="en-us_topic_0118147668__li677391520332">Log in to the management console.</li><li id="en-us_topic_0118147668__li675519100420">In the upper left corner of the page, click <span><img id="en-us_topic_0118147668__en-us_topic_0240829509_image1542118117117" src="en-us_image_0000001747739624.png"></span> and select the desired region and project.</li><li id="en-us_topic_0118147668__li83736197297">Hover on <span><img id="en-us_topic_0118147668__en-us_topic_0167652100_image762510132322" src="en-us_image_0000001794660485.png"></span> in the upper left corner to display <strong id="en-us_topic_0118147668__en-us_topic_0167652100_b9121102522212">Service List</strong> and choose <strong id="en-us_topic_0118147668__en-us_topic_0167652100_b61222025142217">Network</strong> &gt; <strong id="en-us_topic_0118147668__en-us_topic_0167652100_b4124425142210">Elastic Load Balancing</strong>. </li><li id="en-us_topic_0118147668__li12618112113106">Locate the load balancer and click its name.</li><li id="en-us_topic_0118147668__li1227202961019">Under <strong id="en-us_topic_0118147668__b2758637620441">Listeners</strong>, click <strong id="en-us_topic_0118147668__b4695079320441">Add Listener</strong>.</li><li id="en-us_topic_0118147668__li1735219372106">In the <strong id="en-us_topic_0118147668__b8423527061801">Add Listener</strong> dialog box, expand <strong id="en-us_topic_0118147668__b8423527061951">Advanced Settings</strong> and enable the function.</li><li id="en-us_topic_0118147668__li12431144151013">Click <strong id="en-us_topic_0118147668__b84235270620406">OK</strong>.<div class="note" id="en-us_topic_0118147668__note20335123621114"><img src="public_sys-resources/note_3.0-en-us.png"><span class="notetitle"> </span><div class="notebody"><p id="en-us_topic_0118147668__p1866933781115">This function can be enabled only for HTTPS or HTTP listeners.</p>
<div class="section" id="en-us_topic_0118147668__section923919121192"><h4 class="sectiontitle">Enabling the Function</h4><ol id="en-us_topic_0118147668__ol12927248891"><li id="en-us_topic_0118147668__li677391520332">Log in to the management console.</li><li id="en-us_topic_0118147668__li675519100420">In the upper left corner of the page, click <span><img id="en-us_topic_0118147668__image192181915211719" src="en-us_image_0000001747739624.png"></span> and select the desired region and project.</li><li id="en-us_topic_0118147668__li83736197297">Click <span><img id="en-us_topic_0118147668__image125649707211917" src="en-us_image_0000001794660485.png"></span> in the upper left corner to display <strong id="en-us_topic_0118147668__b204086673011917">Service List</strong> and choose <strong id="en-us_topic_0118147668__b117878976711917">Network</strong> &gt; <strong id="en-us_topic_0118147668__b2349406911917">Elastic Load Balancing</strong>.</li><li id="en-us_topic_0118147668__li12618112113106">Locate the load balancer and click its name.</li><li id="en-us_topic_0118147668__li1227202961019">Under <strong id="en-us_topic_0118147668__b2758637620441">Listeners</strong>, click <strong id="en-us_topic_0118147668__b4695079320441">Add Listener</strong>.</li><li id="en-us_topic_0118147668__li1735219372106">In the <strong id="en-us_topic_0118147668__b8423527061801">Add Listener</strong> dialog box, expand <strong id="en-us_topic_0118147668__b8423527061951">Advanced Settings</strong> and enable the function.</li><li id="en-us_topic_0118147668__li12431144151013">Click <strong id="en-us_topic_0118147668__b84235270620406">OK</strong>.<div class="note" id="en-us_topic_0118147668__note20335123621114"><img src="public_sys-resources/note_3.0-en-us.png"><span class="notetitle"> </span><div class="notebody"><p id="en-us_topic_0118147668__p1866933781115">This function can be enabled only for HTTPS or HTTP listeners.</p>
</div></div>
</li></ol>
</div>
<div class="section" id="en-us_topic_0118147668__section20472544101120"><h4 class="sectiontitle">Disabling the Function</h4><ol id="en-us_topic_0118147668__ol178639121124"><li id="en-us_topic_0118147668__li696214817518">Log in to the management console.</li><li id="en-us_topic_0118147668__li29620845119">In the upper left corner of the page, click <span><img id="en-us_topic_0118147668__en-us_topic_0240829509_image1542118117117_1" src="en-us_image_0000001747739624.png"></span> and select the desired region and project.</li><li id="en-us_topic_0118147668__li17301740102218">Hover on <span><img id="en-us_topic_0118147668__en-us_topic_0167652100_image762510132322_1" src="en-us_image_0000001794660485.png"></span> in the upper left corner to display <strong id="en-us_topic_0118147668__en-us_topic_0167652100_b9121102522212_1">Service List</strong> and choose <strong id="en-us_topic_0118147668__en-us_topic_0167652100_b61222025142217_1">Network</strong> &gt; <strong id="en-us_topic_0118147668__en-us_topic_0167652100_b4124425142210_1">Elastic Load Balancing</strong>. </li><li id="en-us_topic_0118147668__li15822710124">Locate the load balancer and click its name.</li><li id="en-us_topic_0118147668__li246713254472">On the <strong id="en-us_topic_0118147668__b162931452113610">Listeners</strong> tab page, locate the listener, click <span><img id="en-us_topic_0118147668__image9295952133614" src="en-us_image_0000001794820001.png"></span> next to the listener name, and select <strong id="en-us_topic_0118147668__b16296105253611">Modify Listener</strong>.</li><li id="en-us_topic_0118147668__li1369784884611">In the <strong id="en-us_topic_0118147668__b445917663714">Modify Listener</strong> dialog box, expand <strong id="en-us_topic_0118147668__b154591467375">Advanced Settings</strong> and disable the function. </li></ol>
<div class="section" id="en-us_topic_0118147668__section20472544101120"><h4 class="sectiontitle">Disabling the Function</h4><ol id="en-us_topic_0118147668__ol178639121124"><li id="en-us_topic_0118147668__li696214817518">Log in to the management console.</li><li id="en-us_topic_0118147668__li29620845119">In the upper left corner of the page, click <span><img id="en-us_topic_0118147668__image170148675511719" src="en-us_image_0000001747739624.png"></span> and select the desired region and project.</li><li id="en-us_topic_0118147668__li17301740102218">Click <span><img id="en-us_topic_0118147668__image89749993411917" src="en-us_image_0000001794660485.png"></span> in the upper left corner to display <strong id="en-us_topic_0118147668__b204698163311917">Service List</strong> and choose <strong id="en-us_topic_0118147668__b190256803711917">Network</strong> &gt; <strong id="en-us_topic_0118147668__b187924601811917">Elastic Load Balancing</strong>.</li><li id="en-us_topic_0118147668__li15822710124">Locate the load balancer and click its name.</li><li id="en-us_topic_0118147668__li246713254472">On the <strong id="en-us_topic_0118147668__b162931452113610">Listeners</strong> tab page, locate the listener, click <span><img id="en-us_topic_0118147668__image9295952133614" src="en-us_image_0000001794820001.png"></span> next to the listener name, and select <strong id="en-us_topic_0118147668__b16296105253611">Modify Listener</strong>.</li><li id="en-us_topic_0118147668__li1369784884611">In the <strong id="en-us_topic_0118147668__b445917663714">Modify Listener</strong> dialog box, expand <strong id="en-us_topic_0118147668__b154591467375">Advanced Settings</strong> and disable the function. </li></ol>
</div>
</div>
<div>

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@ -8,7 +8,7 @@
</div>
<div class="section" id="en-us_topic_0118840332__section87044214500"><h4 class="sectiontitle">Prerequisites</h4><ul id="en-us_topic_0118840332__ul179051318519"><li id="en-us_topic_0118840332__li1590113195118">You have added an HTTPS listener.</li><li id="en-us_topic_0118840332__li9900133512">You have added an HTTP listener.</li></ul>
</div>
<div class="section" id="en-us_topic_0118840332__section12216433224"><h4 class="sectiontitle">Creating Redirection to HTTPS</h4><ol id="en-us_topic_0118840332__ol1950992310246"><li id="en-us_topic_0118840332__li350952352412">Log in to the management console.</li><li id="en-us_topic_0118840332__li155090238248">In the upper left corner of the page, click <span><img id="en-us_topic_0118840332__en-us_topic_0240829509_image1542118117117" src="en-us_image_0000001747739624.png"></span> and select the desired region and project.</li><li id="en-us_topic_0118840332__li4509132319242">Hover on <span><img id="en-us_topic_0118840332__en-us_topic_0167652100_image762510132322" src="en-us_image_0000001794660485.png"></span> in the upper left corner to display <strong id="en-us_topic_0118840332__en-us_topic_0167652100_b9121102522212">Service List</strong> and choose <strong id="en-us_topic_0118840332__en-us_topic_0167652100_b61222025142217">Network</strong> &gt; <strong id="en-us_topic_0118840332__en-us_topic_0167652100_b4124425142210">Elastic Load Balancing</strong>. </li><li id="en-us_topic_0118840332__li85099232242">Locate the load balancer and click its name.</li><li id="en-us_topic_0118840332__li1250916235244">Click <strong id="en-us_topic_0118840332__b113704046794854">Listeners</strong>, locate the HTTP listener, and click its name.</li><li id="en-us_topic_0118840332__li6146812102918">On the <strong id="en-us_topic_0118840332__b177714477720">Forwarding Policies</strong> tab page, click <strong id="en-us_topic_0118840332__b277816472073">Add Forwarding Policy</strong>.<div class="p" id="en-us_topic_0118840332__p18815112143115">
<div class="section" id="en-us_topic_0118840332__section12216433224"><h4 class="sectiontitle">Creating Redirection to HTTPS</h4><ol id="en-us_topic_0118840332__ol1950992310246"><li id="en-us_topic_0118840332__li350952352412">Log in to the management console.</li><li id="en-us_topic_0118840332__li155090238248">In the upper left corner of the page, click <span><img id="en-us_topic_0118840332__image135569988711836" src="en-us_image_0000001747739624.png"></span> and select the desired region and project.</li><li id="en-us_topic_0118840332__li4509132319242">Click <span><img id="en-us_topic_0118840332__image28585827911716" src="en-us_image_0000001794660485.png"></span> in the upper left corner to display <strong id="en-us_topic_0118840332__b209031970111716">Service List</strong> and choose <strong id="en-us_topic_0118840332__b180226734911716">Network</strong> &gt; <strong id="en-us_topic_0118840332__b96378708911716">Elastic Load Balancing</strong>.</li><li id="en-us_topic_0118840332__li85099232242">Locate the load balancer and click its name.</li><li id="en-us_topic_0118840332__li1250916235244">Click <strong id="en-us_topic_0118840332__b113704046794854">Listeners</strong>, locate the HTTP listener, and click its name.</li><li id="en-us_topic_0118840332__li6146812102918">On the <strong id="en-us_topic_0118840332__b177714477720">Forwarding Policies</strong> tab page, click <strong id="en-us_topic_0118840332__b277816472073">Add Forwarding Policy</strong>.<div class="p" id="en-us_topic_0118840332__p18815112143115">
<div class="tablenoborder"><table cellpadding="4" cellspacing="0" summary="" id="en-us_topic_0118840332__table240414672610" frame="border" border="1" rules="all"><caption><b>Table 1 </b>Configuring parameters for redirection</caption><thead align="left"><tr id="en-us_topic_0118840332__row840424619269"><th align="left" class="cellrowborder" valign="top" id="mcps1.3.3.2.6.3.1.2.4.1.1"><p id="en-us_topic_0118840332__p1740444616264">Parameter</p>
</th>
<th align="left" class="cellrowborder" colspan="2" valign="top" id="mcps1.3.3.2.6.3.1.2.4.1.2"><p id="en-us_topic_0118840332__p1040434622618">Setting</p>
@ -31,13 +31,13 @@
</div>
</li><li id="en-us_topic_0118840332__li7511223102412">After the forwarding policy is added, click <strong id="en-us_topic_0118840332__b82335915131">Save</strong>.<p id="en-us_topic_0118840332__p15535184715318"></p>
</li></ol>
<div class="note" id="en-us_topic_0118840332__note88561514120"><img src="public_sys-resources/note_3.0-en-us.png"><span class="notetitle"> </span><div class="notebody"><ul id="en-us_topic_0118840332__ul385615511218"><li id="en-us_topic_0118840332__li118561751913">If requests to an HTTP listener are redirected, the listener will become invalid, but access control to the listener will still take effect.</li><li id="en-us_topic_0118840332__li785645115119"><span id="en-us_topic_0118840332__ph30830488394854">If you create a redirect for an HTTP listener, the backend server will return HTTP 301 Move Permanently to the clients.</span></li></ul>
<div class="note" id="en-us_topic_0118840332__note88561514120"><img src="public_sys-resources/note_3.0-en-us.png"><span class="notetitle"> </span><div class="notebody"><ul id="en-us_topic_0118840332__ul385615511218"><li id="en-us_topic_0118840332__li118561751913">If requests to an HTTP listener are redirected, the listener will become invalid, but access control to the listener will still take effect.</li><li id="en-us_topic_0118840332__li785645115119"><span id="en-us_topic_0118840332__ph35193714189">If you create a redirect for an HTTP listener, the backend server will return HTTP 301 Move Permanently to the clients.</span></li></ul>
</div></div>
<p id="en-us_topic_0118840332__p20240114919112"></p>
</div>
<div class="section" id="en-us_topic_0118840332__section143162510568"><h4 class="sectiontitle">Modifying Redirection to HTTPS</h4><ol id="en-us_topic_0118840332__ol4746835105614"><li id="en-us_topic_0118840332__li1985252614503">Log in to the management console.</li><li id="en-us_topic_0118840332__li128537268501">In the upper left corner of the page, click <span><img id="en-us_topic_0118840332__en-us_topic_0240829509_image1542118117117_1" src="en-us_image_0000001747739624.png"></span> and select the desired region and project.</li><li id="en-us_topic_0118840332__li17301740102218">Hover on <span><img id="en-us_topic_0118840332__en-us_topic_0167652100_image762510132322_1" src="en-us_image_0000001794660485.png"></span> in the upper left corner to display <strong id="en-us_topic_0118840332__en-us_topic_0167652100_b9121102522212_1">Service List</strong> and choose <strong id="en-us_topic_0118840332__en-us_topic_0167652100_b61222025142217_1">Network</strong> &gt; <strong id="en-us_topic_0118840332__en-us_topic_0167652100_b4124425142210_1">Elastic Load Balancing</strong>. </li><li id="en-us_topic_0118840332__li147461535205617">Locate the load balancer and click its name.</li><li id="en-us_topic_0118840332__li274693525620">Click <strong id="en-us_topic_0118840332__b84235270616430">Listeners</strong>, locate the HTTP listener, and click its name.</li><li id="en-us_topic_0118840332__li217931118341">On the <strong id="en-us_topic_0118840332__b116931550122419">Forwarding Policies</strong> tab page, click <strong id="en-us_topic_0118840332__b4399175842420">Edit</strong>.</li><li id="en-us_topic_0118840332__li48502591361">You can change the HTTPS listener to which requests are redirected as required.</li><li id="en-us_topic_0118840332__li827319171517">Click <strong id="en-us_topic_0118840332__b635016569446">Save</strong>.</li></ol>
<div class="section" id="en-us_topic_0118840332__section143162510568"><h4 class="sectiontitle">Modifying Redirection to HTTPS</h4><ol id="en-us_topic_0118840332__ol4746835105614"><li id="en-us_topic_0118840332__li1985252614503">Log in to the management console.</li><li id="en-us_topic_0118840332__li128537268501">In the upper left corner of the page, click <span><img id="en-us_topic_0118840332__image104412412011836" src="en-us_image_0000001747739624.png"></span> and select the desired region and project.</li><li id="en-us_topic_0118840332__li17301740102218">Click <span><img id="en-us_topic_0118840332__image135595829211716" src="en-us_image_0000001794660485.png"></span> in the upper left corner to display <strong id="en-us_topic_0118840332__b158211000111716">Service List</strong> and choose <strong id="en-us_topic_0118840332__b159622887211716">Network</strong> &gt; <strong id="en-us_topic_0118840332__b93085239711716">Elastic Load Balancing</strong>.</li><li id="en-us_topic_0118840332__li147461535205617">Locate the load balancer and click its name.</li><li id="en-us_topic_0118840332__li274693525620">Click <strong id="en-us_topic_0118840332__b84235270616430">Listeners</strong>, locate the HTTP listener, and click its name.</li><li id="en-us_topic_0118840332__li217931118341">On the <strong id="en-us_topic_0118840332__b116931550122419">Forwarding Policies</strong> tab page, click <strong id="en-us_topic_0118840332__b4399175842420">Edit</strong>.</li><li id="en-us_topic_0118840332__li48502591361">You can change the HTTPS listener to which requests are redirected as required.</li><li id="en-us_topic_0118840332__li827319171517">Click <strong id="en-us_topic_0118840332__b635016569446">Save</strong>.</li></ol>
</div>
<div class="section" id="en-us_topic_0118840332__section4978153735217"><h4 class="sectiontitle">Deleting Redirection to HTTPS</h4><ol id="en-us_topic_0118840332__ol1275190185510"><li id="en-us_topic_0118840332__li11682338145016">Log in to the management console.</li><li id="en-us_topic_0118840332__li768211389508">In the upper left corner of the page, click <span><img id="en-us_topic_0118840332__en-us_topic_0240829509_image1542118117117_2" src="en-us_image_0000001747739624.png"></span> and select the desired region and project.</li><li id="en-us_topic_0118840332__li0839203002214">Hover on <span><img id="en-us_topic_0118840332__en-us_topic_0167652100_image762510132322_2" src="en-us_image_0000001794660485.png"></span> in the upper left corner to display <strong id="en-us_topic_0118840332__en-us_topic_0167652100_b9121102522212_2">Service List</strong> and choose <strong id="en-us_topic_0118840332__en-us_topic_0167652100_b61222025142217_2">Network</strong> &gt; <strong id="en-us_topic_0118840332__en-us_topic_0167652100_b4124425142210_2">Elastic Load Balancing</strong>. </li><li id="en-us_topic_0118840332__li3474171185518">Locate the load balancer and click its name.</li><li id="en-us_topic_0118840332__li4474111145517">Click <strong id="en-us_topic_0118840332__b905016811">Listeners</strong>, locate the listener, and click its name.</li><li id="en-us_topic_0118840332__li1071745513242">On the <strong id="en-us_topic_0118840332__b18110111416289">Forwarding Policies</strong> tab page, click <strong id="en-us_topic_0118840332__b1011551410285">Delete</strong> on the right of the target forwarding policy.</li><li id="en-us_topic_0118840332__li1750161655619">In the displayed dialog box, click <strong id="en-us_topic_0118840332__b975141418112">Yes</strong>.</li></ol>
<div class="section" id="en-us_topic_0118840332__section4978153735217"><h4 class="sectiontitle">Deleting Redirection to HTTPS</h4><ol id="en-us_topic_0118840332__ol1275190185510"><li id="en-us_topic_0118840332__li11682338145016">Log in to the management console.</li><li id="en-us_topic_0118840332__li768211389508">In the upper left corner of the page, click <span><img id="en-us_topic_0118840332__image117836314111836" src="en-us_image_0000001747739624.png"></span> and select the desired region and project.</li><li id="en-us_topic_0118840332__li0839203002214">Click <span><img id="en-us_topic_0118840332__image165428191611716" src="en-us_image_0000001794660485.png"></span> in the upper left corner to display <strong id="en-us_topic_0118840332__b165211904111716">Service List</strong> and choose <strong id="en-us_topic_0118840332__b6969474311716">Network</strong> &gt; <strong id="en-us_topic_0118840332__b88593533811716">Elastic Load Balancing</strong>.</li><li id="en-us_topic_0118840332__li3474171185518">Locate the load balancer and click its name.</li><li id="en-us_topic_0118840332__li4474111145517">Click <strong id="en-us_topic_0118840332__b1979593300">Listeners</strong>, locate the listener, and click its name.</li><li id="en-us_topic_0118840332__li1071745513242">On the <strong id="en-us_topic_0118840332__b18110111416289">Forwarding Policies</strong> tab page, click <strong id="en-us_topic_0118840332__b1011551410285">Delete</strong> on the right of the target forwarding policy.</li><li id="en-us_topic_0118840332__li1750161655619">In the displayed dialog box, click <strong id="en-us_topic_0118840332__b975141418112">Yes</strong>.</li></ol>
</div>
</div>
<div>

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@ -5,9 +5,9 @@
</div>
<div class="section" id="en-us_topic_0150301849__section13209453184819"><h4 class="sectiontitle">Constraints</h4><p id="en-us_topic_0150301849__p3339257124817">You can enable HTTP/2 only for HTTPS listeners.</p>
</div>
<div class="section" id="en-us_topic_0150301849__section65213442"><h4 class="sectiontitle">Enabling HTTP/2 When Adding a Listener</h4><ol id="en-us_topic_0150301849__ol280848"><li id="en-us_topic_0150301849__li677391520332">Log in to the management console.</li><li id="en-us_topic_0150301849__li675519100420">In the upper left corner of the page, click <span><img id="en-us_topic_0150301849__en-us_topic_0240829509_image1542118117117" src="en-us_image_0000001747739624.png"></span> and select the desired region and project.</li><li id="en-us_topic_0150301849__li83736197297">Hover on <span><img id="en-us_topic_0150301849__en-us_topic_0167652100_image762510132322" src="en-us_image_0000001794660485.png"></span> in the upper left corner to display <strong id="en-us_topic_0150301849__en-us_topic_0167652100_b9121102522212">Service List</strong> and choose <strong id="en-us_topic_0150301849__en-us_topic_0167652100_b61222025142217">Network</strong> &gt; <strong id="en-us_topic_0150301849__en-us_topic_0167652100_b4124425142210">Elastic Load Balancing</strong>. </li><li id="en-us_topic_0150301849__li2953540">Locate the load balancer and click its name.</li><li id="en-us_topic_0150301849__li26581867">Under <strong id="en-us_topic_0150301849__b2758637620441">Listeners</strong>, click <strong id="en-us_topic_0150301849__b4695079320441">Add Listener</strong>.</li><li id="en-us_topic_0150301849__li9781191704012">In the <strong id="en-us_topic_0150301849__b1921212175566">Add Listener</strong> dialog box, set <strong id="en-us_topic_0150301849__b14281421145616">Frontend Protocol</strong> to <strong id="en-us_topic_0150301849__b19772025165618">HTTPS</strong>.</li><li id="en-us_topic_0150301849__li37910215">Expand <strong id="en-us_topic_0150301849__b14230545162818">Advanced Settings</strong> and enable HTTP/2.</li><li id="en-us_topic_0150301849__li5647617">Walk through the steps, set relevant parameters and in the end click <strong id="en-us_topic_0150301849__b1712016174392">Submit</strong>.</li></ol>
<div class="section" id="en-us_topic_0150301849__section65213442"><h4 class="sectiontitle">Enabling HTTP/2 When Adding a Listener</h4><ol id="en-us_topic_0150301849__ol280848"><li id="en-us_topic_0150301849__li677391520332">Log in to the management console.</li><li id="en-us_topic_0150301849__li675519100420">In the upper left corner of the page, click <span><img id="en-us_topic_0150301849__image143198720511835" src="en-us_image_0000001747739624.png"></span> and select the desired region and project.</li><li id="en-us_topic_0150301849__li83736197297">Click <span><img id="en-us_topic_0150301849__image107649977911714" src="en-us_image_0000001794660485.png"></span> in the upper left corner to display <strong id="en-us_topic_0150301849__b27468625111714">Service List</strong> and choose <strong id="en-us_topic_0150301849__b5026013111714">Network</strong> &gt; <strong id="en-us_topic_0150301849__b146213816711714">Elastic Load Balancing</strong>.</li><li id="en-us_topic_0150301849__li2953540">Locate the load balancer and click its name.</li><li id="en-us_topic_0150301849__li26581867">Under <strong id="en-us_topic_0150301849__b2758637620441">Listeners</strong>, click <strong id="en-us_topic_0150301849__b4695079320441">Add Listener</strong>.</li><li id="en-us_topic_0150301849__li9781191704012">In the <strong id="en-us_topic_0150301849__b1921212175566">Add Listener</strong> dialog box, set <strong id="en-us_topic_0150301849__b14281421145616">Frontend Protocol</strong> to <strong id="en-us_topic_0150301849__b19772025165618">HTTPS</strong>.</li><li id="en-us_topic_0150301849__li37910215">Expand <strong id="en-us_topic_0150301849__b14230545162818">Advanced Settings</strong> and enable HTTP/2.</li><li id="en-us_topic_0150301849__li5647617">Walk through the steps, set relevant parameters and in the end click <strong id="en-us_topic_0150301849__b1712016174392">Submit</strong>.</li></ol>
</div>
<div class="section" id="en-us_topic_0150301849__section50050067"><h4 class="sectiontitle">Enabling or Disabling HTTP/2 When Modifying a Listener</h4><ol id="en-us_topic_0150301849__ol41115340"><li id="en-us_topic_0150301849__li389555917494">Log in to the management console.</li><li id="en-us_topic_0150301849__li1895185914495">In the upper left corner of the page, click <span><img id="en-us_topic_0150301849__en-us_topic_0240829509_image1542118117117_1" src="en-us_image_0000001747739624.png"></span> and select the desired region and project.</li><li id="en-us_topic_0150301849__li17301740102218">Hover on <span><img id="en-us_topic_0150301849__en-us_topic_0167652100_image762510132322_1" src="en-us_image_0000001794660485.png"></span> in the upper left corner to display <strong id="en-us_topic_0150301849__en-us_topic_0167652100_b9121102522212_1">Service List</strong> and choose <strong id="en-us_topic_0150301849__en-us_topic_0167652100_b61222025142217_1">Network</strong> &gt; <strong id="en-us_topic_0150301849__en-us_topic_0167652100_b4124425142210_1">Elastic Load Balancing</strong>. </li><li id="en-us_topic_0150301849__li18211898">Locate the load balancer and click its name.</li><li id="en-us_topic_0150301849__li147251248871">Click <strong id="en-us_topic_0150301849__b168415017102">Listeners</strong>, locate the listener, click <span><img id="en-us_topic_0150301849__image15288143517595" src="en-us_image_0000001794819893.png"></span> next to the listener name, and select <strong id="en-us_topic_0150301849__b1168635013101">Modify Listener</strong>.</li><li id="en-us_topic_0150301849__li65877656">In the <strong id="en-us_topic_0150301849__b842352706155941">Modify Listener</strong> dialog box, expand <strong id="en-us_topic_0150301849__b842352706155951">Advanced Settings</strong> and enable or disable HTTP/2.</li><li id="en-us_topic_0150301849__li1312423718">Confirm the parameters, and click <strong id="en-us_topic_0150301849__b1489210190379">Next</strong>.</li><li id="en-us_topic_0150301849__li55123414211">Click <strong id="en-us_topic_0150301849__b139381626133712">Finish</strong>.</li><li id="en-us_topic_0150301849__li15263717114">Click <strong id="en-us_topic_0150301849__b0696699121">OK</strong>.</li></ol>
<div class="section" id="en-us_topic_0150301849__section50050067"><h4 class="sectiontitle">Enabling or Disabling HTTP/2 When Modifying a Listener</h4><ol id="en-us_topic_0150301849__ol41115340"><li id="en-us_topic_0150301849__li389555917494">Log in to the management console.</li><li id="en-us_topic_0150301849__li1895185914495">In the upper left corner of the page, click <span><img id="en-us_topic_0150301849__image104836939511835" src="en-us_image_0000001747739624.png"></span> and select the desired region and project.</li><li id="en-us_topic_0150301849__li17301740102218">Click <span><img id="en-us_topic_0150301849__image156105879011714" src="en-us_image_0000001794660485.png"></span> in the upper left corner to display <strong id="en-us_topic_0150301849__b4996404211714">Service List</strong> and choose <strong id="en-us_topic_0150301849__b29898622511714">Network</strong> &gt; <strong id="en-us_topic_0150301849__b7187257611714">Elastic Load Balancing</strong>.</li><li id="en-us_topic_0150301849__li18211898">Locate the load balancer and click its name.</li><li id="en-us_topic_0150301849__li147251248871">Click <strong id="en-us_topic_0150301849__b168415017102">Listeners</strong>, locate the listener, click <span><img id="en-us_topic_0150301849__image15288143517595" src="en-us_image_0000001794819893.png"></span> next to the listener name, and select <strong id="en-us_topic_0150301849__b1168635013101">Modify Listener</strong>.</li><li id="en-us_topic_0150301849__li65877656">In the <strong id="en-us_topic_0150301849__b842352706155941">Modify Listener</strong> dialog box, expand <strong id="en-us_topic_0150301849__b842352706155951">Advanced Settings</strong> and enable or disable HTTP/2.</li><li id="en-us_topic_0150301849__li1312423718">Confirm the parameters, and click <strong id="en-us_topic_0150301849__b1489210190379">Next</strong>.</li><li id="en-us_topic_0150301849__li55123414211">Click <strong id="en-us_topic_0150301849__b139381626133712">Finish</strong>.</li><li id="en-us_topic_0150301849__li15263717114">Click <strong id="en-us_topic_0150301849__b0696699121">OK</strong>.</li></ol>
</div>
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@ -181,9 +181,9 @@
</tr>
<tr id="en-us_topic_0287737145__en-us_topic_0000001819323754_row11442834195619"><td class="cellrowborder" valign="top" width="23.3%" headers="mcps1.3.7.3.3.2.4.1.1 "><p id="en-us_topic_0287737145__en-us_topic_0000001819323754_p15442143412563">New HTTP and HTTPS connections</p>
</td>
<td class="cellrowborder" valign="top" width="38.29%" headers="mcps1.3.7.3.3.2.4.1.2 "><p id="en-us_topic_0287737145__en-us_topic_0000001819323754_p944211342560">1,000 + 50 x 10 = 1,500</p>
<td class="cellrowborder" valign="top" width="38.29%" headers="mcps1.3.7.3.3.2.4.1.2 "><p id="en-us_topic_0287737145__en-us_topic_0000001819323754_p944211342560">1,000 + 50 × 10 = 1,500</p>
</td>
<td class="cellrowborder" valign="top" width="38.41%" headers="mcps1.3.7.3.3.2.4.1.3 "><p id="en-us_topic_0287737145__en-us_topic_0000001819323754_p644213419569">1,000 + 150 x 10 = 2,500</p>
<td class="cellrowborder" valign="top" width="38.41%" headers="mcps1.3.7.3.3.2.4.1.3 "><p id="en-us_topic_0287737145__en-us_topic_0000001819323754_p644213419569">1,000 + 150 × 10 = 2,500</p>
</td>
</tr>
<tr id="en-us_topic_0287737145__en-us_topic_0000001819323754_row194438345567"><td class="cellrowborder" valign="top" width="23.3%" headers="mcps1.3.7.3.3.2.4.1.1 "><p id="en-us_topic_0287737145__en-us_topic_0000001819323754_p1442133413566">Description</p>
@ -201,7 +201,7 @@
</li></ul>
<p id="en-us_topic_0287737145__en-us_topic_0000001819323754_p793283811127"><a href="#en-us_topic_0287737145__en-us_topic_0000001819323754_table14428152722818">Table 6</a> and <a href="#en-us_topic_0287737145__en-us_topic_0000001819323754_table201281815505">Table 7</a> list the fixed specifications of dedicated load balancers.</p>
<div class="tablenoborder"><a name="en-us_topic_0287737145__en-us_topic_0000001819323754_table14428152722818"></a><a name="en-us_topic_0000001819323754_table14428152722818"></a><table cellpadding="4" cellspacing="0" summary="" id="en-us_topic_0287737145__en-us_topic_0000001819323754_table14428152722818" frame="border" border="1" rules="all"><caption><b>Table 6 </b>Fixed specifications for a network load balancer (TCP/UDP)</caption><thead align="left"><tr id="en-us_topic_0287737145__en-us_topic_0000001819323754_en-us_topic_0172664865_en-us_topic_0169320426_row45937995118"><th align="left" class="cellrowborder" valign="top" width="14.931493149314932%" id="mcps1.3.9.2.6.1.1"><p id="en-us_topic_0287737145__en-us_topic_0000001819323754_en-us_topic_0172664865_p39031610793"><strong id="en-us_topic_0287737145__en-us_topic_0000001819323754_b8842123254317">Type</strong></p>
<div class="tablenoborder"><a name="en-us_topic_0287737145__en-us_topic_0000001819323754_table14428152722818"></a><a name="en-us_topic_0000001819323754_table14428152722818"></a><table cellpadding="4" cellspacing="0" summary="" id="en-us_topic_0287737145__en-us_topic_0000001819323754_table14428152722818" frame="border" border="1" rules="all"><caption><b>Table 6 </b>Fixed specifications for a network load balancer (TCP/UDP)</caption><thead align="left"><tr id="en-us_topic_0287737145__en-us_topic_0000001819323754_en-us_topic_0172664865_en-us_topic_0169320426_row45937995118"><th align="left" class="cellrowborder" valign="top" width="14.931493149314932%" id="mcps1.3.9.2.6.1.1"><p id="en-us_topic_0287737145__en-us_topic_0000001819323754_en-us_topic_0172664865_p39031610793"><strong id="en-us_topic_0287737145__en-us_topic_0000001819323754_b6304121224112">Specification</strong></p>
</th>
<th align="left" class="cellrowborder" valign="top" width="20.72207220722072%" id="mcps1.3.9.2.6.1.2"><p id="en-us_topic_0287737145__en-us_topic_0000001819323754_en-us_topic_0172664865_p62821424796"><strong id="en-us_topic_0287737145__en-us_topic_0000001819323754_b15489135610322">Maximum Connections</strong></p>
</th>
@ -283,7 +283,7 @@
</table>
</div>
<div class="tablenoborder"><a name="en-us_topic_0287737145__en-us_topic_0000001819323754_table201281815505"></a><a name="en-us_topic_0000001819323754_table201281815505"></a><table cellpadding="4" cellspacing="0" summary="" id="en-us_topic_0287737145__en-us_topic_0000001819323754_table201281815505" frame="border" border="1" rules="all"><caption><b>Table 7 </b>Fixed specifications for an application load balancer (HTTP/HTTPS)</caption><thead align="left"><tr id="en-us_topic_0287737145__en-us_topic_0000001819323754_en-us_topic_0172664865_row152232014717"><th align="left" class="cellrowborder" valign="top" width="8.30916908309169%" id="mcps1.3.10.2.9.1.1"><p id="en-us_topic_0287737145__en-us_topic_0000001819323754_en-us_topic_0172664865_p6223905472"><strong id="en-us_topic_0287737145__en-us_topic_0000001819323754_b4478115513317">Type</strong></p>
<div class="tablenoborder"><a name="en-us_topic_0287737145__en-us_topic_0000001819323754_table201281815505"></a><a name="en-us_topic_0000001819323754_table201281815505"></a><table cellpadding="4" cellspacing="0" summary="" id="en-us_topic_0287737145__en-us_topic_0000001819323754_table201281815505" frame="border" border="1" rules="all"><caption><b>Table 7 </b>Fixed specifications for an application load balancer (HTTP/HTTPS)</caption><thead align="left"><tr id="en-us_topic_0287737145__en-us_topic_0000001819323754_en-us_topic_0172664865_row152232014717"><th align="left" class="cellrowborder" valign="top" width="8.30916908309169%" id="mcps1.3.10.2.9.1.1"><p id="en-us_topic_0287737145__en-us_topic_0000001819323754_en-us_topic_0172664865_p6223905472"><strong id="en-us_topic_0287737145__en-us_topic_0000001819323754_b138363019410">Specification</strong></p>
</th>
<th align="left" class="cellrowborder" valign="top" width="10.92890710928907%" id="mcps1.3.10.2.9.1.2"><p id="en-us_topic_0287737145__en-us_topic_0000001819323754_en-us_topic_0172664865_p122238084714"><strong id="en-us_topic_0287737145__en-us_topic_0000001819323754_b1213121921918">Maximum Connections</strong></p>
</th>