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DDS UMN 20221101 version

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Reviewed-by: Hasko, Vladimir <vladimir.hasko@t-systems.com>
Co-authored-by: Wang , Deng Ke <wangdengke2@huawei.com>
Co-committed-by: Wang , Deng Ke <wangdengke2@huawei.com>
This commit is contained in:
Wang , Deng Ke
2022-11-24 09:05:29 +00:00
committed by zuul
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<h1 class="topictitle1">Basic Concepts</h1>
<div id="body44041463"></div>
<div>
<ul class="ullinks">
<li class="ulchildlink"><strong><a href="dds_01_0002.html">Cluster</a></strong><br>
</li>
<li class="ulchildlink"><strong><a href="dds_01_0005.html">Database Parameter Group</a></strong><br>
</li>
<li class="ulchildlink"><strong><a href="dds_01_0027.html">Regions and AZs</a></strong><br>
</li>
</ul>
<div class="familylinks">
<div class="parentlink"><strong>Parent topic:</strong> <a href="en-us_topic_user_guide.html">Introduction</a></div>
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<h1 class="topictitle1">Cluster</h1>
<div id="body1529654902838"><p id="dds_01_0002__p03931746111514">DDS cluster instances consist of mongos, config, and shard nodes. The following diagram shows the node relationships.</p>
<div class="fignone" id="dds_01_0002__fig20857165904711"><span class="figcap"><b>Figure 1 </b>Diagram of node relationships</span><br><span><img id="dds_01_0002__image48576592473" src="en-us_image_0284275219.png"></span></div>
<div class="section" id="dds_01_0002__section2471635113117"><h4 class="sectiontitle">mongos</h4><p id="dds_01_0002__p5397278143035">A mongos is a router for reading and writing data, providing a unified interface for accessing DB instances.</p>
<ul id="dds_01_0002__ul7747113611462"><li id="dds_01_0002__li1074719364468">Each DB instance has 2 to 16 mongos. You can specify the quantity.</li><li id="dds_01_0002__li474733612462">A mongos reads configuration settings from configs and allocates read and write requests to shards. You can connect to a mongos directly.</li></ul>
</div>
<div class="section" id="dds_01_0002__section109912514314"><h4 class="sectiontitle">config</h4><p id="dds_01_0002__p49633946153220">A config stores configuration settings for DB instances and consists of one replica set.</p>
<ul id="dds_01_0002__ul17872294911"><li id="dds_01_0002__li158713234917">The availability of a config is the prerequisite to deploying a DB instance or modifying the instance information.</li><li id="dds_01_0002__li787112154919">You cannot connect to a config directly.</li></ul>
</div>
<div class="section" id="dds_01_0002__section16795142043220"><h4 class="sectiontitle">shard</h4><p id="dds_01_0002__p32858642161053">In the cluster instance, shards are used to store user data.</p>
<ul id="dds_01_0002__ul165293820493"><li id="dds_01_0002__li252912854914">Each DB instance has 2 to 16 shards. You can specify the quantity.</li><li id="dds_01_0002__li55295884911">Each shard is deployed as a replica set to ensure data redundancy and high reliability.</li><li id="dds_01_0002__li155291189493">You cannot connect to a shard directly.</li></ul>
</div>
</div>
<div>
<div class="familylinks">
<div class="parentlink"><strong>Parent topic:</strong> <a href="dds_01_0001.html">Basic Concepts</a></div>
</div>
</div>

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<h1 class="topictitle1">Database Parameter Group</h1>
<div id="body63334794"><p id="dds_01_0005__p25613828112035">A database parameter group is a collection of configuration parameters and values and can be applied to multiple DB instances.</p>
</div>
<div>
<div class="familylinks">
<div class="parentlink"><strong>Parent topic:</strong> <a href="dds_01_0001.html">Basic Concepts</a></div>
</div>
</div>

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<h1 class="topictitle1">Product Advantages</h1>
<div id="body1522807549935"></div>
<div>
<ul class="ullinks">
<li class="ulchildlink"><strong><a href="dds_01_0007.html">High Reliability</a></strong><br>
</li>
<li class="ulchildlink"><strong><a href="dds_01_0008.html">High Security</a></strong><br>
</li>
<li class="ulchildlink"><strong><a href="dds_01_0010.html">Ease of Use</a></strong><br>
</li>
<li class="ulchildlink"><strong><a href="dds_01_0009.html">Scalability</a></strong><br>
</li>
</ul>
<div class="familylinks">
<div class="parentlink"><strong>Parent topic:</strong> <a href="en-us_topic_user_guide.html">Introduction</a></div>
</div>
</div>

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<h1 class="topictitle1">High Reliability</h1>
<div id="body1523157563922"><div class="section" id="dds_01_0007__section56101305112535"><h4 class="sectiontitle">Failover</h4><p id="dds_01_0007__p38650255112545">The three-node replica set architecture of DDS ensures high service availability.</p>
<p id="dds_01_0007__p12307983112545">In a replica set, both the primary and secondary nodes provide services. If a primary node goes down or becomes faulty, a secondary node is automatically assigned to the primary role and continues normal operation. If a secondary node is unavailable, a hidden node will take the role of the secondary to ensure high availability.</p>
</div>
<div class="section" id="dds_01_0007__section18363126194820"><h4 class="sectiontitle">Multi-Copy Redundancy</h4><p id="dds_01_0007__p359664514713">config and shard use the three-node replica set HA architecture. Using this architecture, nodes are deployed on different servers and racks.</p>
</div>
<div class="section" id="dds_01_0007__section144894164812"><h4 class="sectiontitle">Data Backups</h4><p id="dds_01_0007__p1427511361493">Data can be backed up automatically or manually. Automated backups execute full backups on DB instances. A manual backup is a full backup of DB instances initiated by users. These backups can be used to restore DB instances with a few clicks.</p>
<p id="dds_01_0007__p65964452473">Backups are stored in Object Storage Service (OBS), improving the data disaster recovery capabilities while reducing the needed storage space. When a DB instance is created, the automated backup policy is enabled by default. After the DB instance is created, an automated full backup is triggered instantly. The backup retention period is 7 days by default. You can set the backup retention period and modify the backup policy. In addition, you can initiate backup at any time according to your service requirements. Manual backups are saved until you manually delete them.</p>
</div>
<div class="section" id="dds_01_0007__section986045820483"><h4 class="sectiontitle">Data Restore</h4><p id="dds_01_0007__p1802338811358">You can use backup data to restore instance data. Restored data is the same as the original data.</p>
</div>
</div>
<div>
<div class="familylinks">
<div class="parentlink"><strong>Parent topic:</strong> <a href="dds_01_0006.html">Product Advantages</a></div>
</div>
</div>

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<h1 class="topictitle1">High Security</h1>
<div id="body1523157563922"><div class="section" id="dds_01_0008__section157471650114110"><h4 class="sectiontitle">Network Isolation</h4><p id="dds_01_0008__p3308128144112">DDS uses Virtual Private Clouds (VPCs) and network security groups to isolate your DB instances. VPCs allow you to configure IP address ranges that are allowed <span class="keyword" id="dds_01_0008__keyword11226140173518">access to DDS</span>. You can run your DB instances in a VPC to improve security. To further enhance database security, you can configure subnets and security groups to control access to DB instances.</p>
</div>
<div class="section" id="dds_01_0008__section36087416422"><h4 class="sectiontitle">Access Control</h4><p id="dds_01_0008__p18308482418">VPC security groups can have rules that govern both inbound and outbound traffic of DB instances.</p>
</div>
<div class="section" id="dds_01_0008__section05340203433"><h4 class="sectiontitle">Transmission Encryption</h4><p id="dds_01_0008__p830810894115">DDS uses Secure Sockets Layer (SSL) to encrypt transmitted data. You can download a certificate authority (CA) from the DDS console and upload it for authentication when connecting to a database.</p>
</div>
<div class="section" id="dds_01_0008__section13931102311470"><h4 class="sectiontitle">Security Protection</h4><p id="dds_01_0008__p43613116165432">DDS provides a multi-layer network protection against various malicious attacks. The protection system consists of VPCs, subnets, security groups, DDoS protection, and SSL.</p>
<ul id="dds_01_0008__ul32942050165536"><li id="dds_01_0008__li58325462165536">VPC is used to isolate tenants and control access to databases.</li><li id="dds_01_0008__li18619715165536">The SSL connection ensures data security and integrity.</li><li id="dds_01_0008__li31046077165536">Security group rules restrict traffic to specific IP addresses and ports, securing connections between DDS and other services.</li></ul>
</div>
<div class="section" id="dds_01_0008__section1305495014142"><h4 class="sectiontitle">Performance Monitoring</h4><p id="dds_01_0008__p3638310511648">DDS monitors instance performance, reducing O&amp;M activities by as much as 60%. It provides real-time monitoring information about CPU utilization, disk usage, IOPS, and number of active connections, allowing you to check instance status at any time.</p>
<p id="dds_01_0008__p53627552103843">In asynchronous disk scenarios, DDS provides excellent plugin performance and process memory databases. It also provides the secondary index function to meet dynamic query requirements.</p>
</div>
</div>
<div>
<div class="familylinks">
<div class="parentlink"><strong>Parent topic:</strong> <a href="dds_01_0006.html">Product Advantages</a></div>
</div>
</div>

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<h1 class="topictitle1">Scalability</h1>
<div id="body1523176566513"><div class="section" id="dds_01_0009__section196165812279"><h4 class="sectiontitle">Elastic Scaling</h4><p id="dds_01_0009__p9617128102711">DDS supports the cluster mode. You can select multiple mongos and shards. When your service changes or the current instance configuration cannot meet the application performance requirements, DDS allows you to scale up storage space of shards, or add new shards. During the expansion, your services will not be interrupted.</p>
</div>
<div class="section" id="dds_01_0009__section3892342014122"><h4 class="sectiontitle">On-demand Scaling</h4><p id="dds_01_0009__p4151772163758">DDS supports the three-node replica set mode. You can scale up the storage space based on your service requirements and only pay for the resources you consumed. If the storage space of the current DB instance cannot meet your application requirements, you can expand the storage capacity. During the expansion, your services will not be interrupted.</p>
</div>
</div>
<div>
<div class="familylinks">
<div class="parentlink"><strong>Parent topic:</strong> <a href="dds_01_0006.html">Product Advantages</a></div>
</div>
</div>

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<h1 class="topictitle1">Ease of Use</h1>
<div id="body1523159625176"><div class="section" id="dds_01_0010__section61491233144328"><h4 class="sectiontitle">Instant Availability</h4><p id="dds_01_0010__p37262363619">You can create a DB instance on the management console and access DDS through an Elastic Cloud Server (ECS) to reduce the application response time. If you need to access a DB instance from your local devices, you can bind an elastic IP address (EIP) to the instance.</p>
</div>
<div class="section" id="dds_01_0010__section11590950144344"><h4 class="sectiontitle">High Compatibility</h4><p id="dds_01_0010__p49545217151751">DDS is a document-oriented <span class="keyword" id="dds_01_0010__keyword8901516133710">NoSQL database</span>. It is fully compatible with <span class="keyword" id="dds_01_0010__keyword015433210372">MongoDB</span>.</p>
</div>
<div class="section" id="dds_01_0010__section43893088141312"><h4 class="sectiontitle">Easy O&amp;M</h4><p id="dds_01_0010__p57240111647">You can easily perform restart, backup, and data recovery operations on instances using a graphical user interface (GUI)</p>
</div>
</div>
<div>
<div class="familylinks">
<div class="parentlink"><strong>Parent topic:</strong> <a href="dds_01_0006.html">Product Advantages</a></div>
</div>
</div>

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<h1 class="topictitle1">Cluster Architecture</h1>
<div id="body50525752"><p id="dds_01_0011__p16715644165033">Each DDS cluster is an independent document database. A sharded cluster consists of mongos, config, and shard.</p>
<p id="dds_01_0011__p4243244165318">Data read and write requests are forwarded by mongos. A mongos reads configuration settings from configs and allocates the read and write requests to shards, making it easy to cope with high concurrency scenarios. In addition, each config and shard is a replica set that provides high availability. The following figure shows the DDS cluster architecture.</p>
<div class="fignone" id="dds_01_0011__fig1930710481542"><span class="figcap"><b>Figure 1 </b>Cluster architecture</span><br><span><img id="dds_01_0011__image1530774814410" src="en-us_image_0284274967.png"></span></div>
<ul id="dds_01_0011__ul3754275165450"><li id="dds_01_0011__li18678526165450">Each mongos is a single node. To realize load balancing and automatic failover, you can provision multiple mongos. A single cluster supports 2 to 16 mongos.</li><li id="dds_01_0011__li9025895165450">Each shard is a three-node replica set. A single cluster supports 2 to 16 shards.</li><li id="dds_01_0011__li58596018165450">config is mandatory in a cluster instance. It stores instance configuration information and consists of one replica set.</li><li id="dds_01_0011__li37457807165450">mongos and shards cannot be added using native commands but can be scaled out on the DDS console.</li><li id="dds_01_0011__li5054286165450">You cannot connect to a config and shard. Data operations can only be delivered by connecting to mongos.</li><li id="dds_01_0011__li17418689165450">Currently, a three-node replica set cannot be directly upgraded to a cluster.</li></ul>
</div>
<div>
<div class="familylinks">
<div class="parentlink"><strong>Parent topic:</strong> <a href="dds_01_0021.html">System Architecture</a></div>
</div>
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<h1 class="topictitle1">Replica Set Architecture</h1>
<div id="body1495008759160"><p id="dds_01_0012__p7418203421717">A replica set consists of a set of mongod processes and provides a collection of data nodes to ensure data redundancy and reliability.</p>
<div class="note" id="dds_01_0012__note384375010261"><img src="public_sys-resources/note_3.0-en-us.png"><span class="notetitle"> </span><div class="notebody"><p id="dds_01_0012__p188447506264">For details about the mongod process, visit <a href="https://docs.mongodb.com/v3.2/tutorial/manage-mongodb-processes/index.html" target="_blank" rel="noopener noreferrer">https://docs.mongodb.com/v3.2/tutorial/manage-mongodb-processes/index.html</a>.</p>
</div></div>
<p id="dds_01_0012__p4922292317836">A replica set consists of three nodes: primary, secondary, and hidden. The three-node architecture is automatically set up, and the three nodes synchronize data with each other automatically to ensure data reliability.</p>
<ul id="dds_01_0012__ul7572160172233"><li id="dds_01_0012__li1040581172233">The primary node is used to read and write requests.</li><li id="dds_01_0012__li9365232172233">The secondary node is used to read requests.</li><li id="dds_01_0012__li17178226172233">The hidden node is used to back up data.</li></ul>
<p id="dds_01_0012__p440813339588">You can directly perform operations on the primary and secondary nodes. If a primary node goes down or becomes faulty, a secondary node is automatically assigned to the primary role and continues normal operation. If a secondary node is unavailable, a hidden node will take the role of the secondary to ensure high availability. The following figure shows the replica set architecture.</p>
<div class="fignone" id="dds_01_0012__fig4417616382"><span class="figcap"><b>Figure 1 </b>Replica set architecture</span><br><span><img id="dds_01_0012__image144172161811" src="en-us_image_0284275085.png"></span></div>
<ul id="dds_01_0012__ul63108919111140"><li id="dds_01_0012__li31109359111140">Supports multiple management and control tasks, such as creating instances, changing configurations, and backing up instances. The system flexibly controls and tracks tasks, and manages exceptions based on the operations delivered by users.</li><li id="dds_01_0012__li11548782111140">Collects performance monitoring information about DB instances, including basic metrics, storage space, access requests, and the number of operations.</li><li id="dds_01_0012__li36830180111140">Collects slow query logs and access control logs, recording DB instance running status.</li><li id="dds_01_0012__li63036170111140">Backs up DB instance data and uploads it to OBS buckets. Currently, DDS supports automated and manual backup. Automated backups are kept for seven days by default.</li></ul>
</div>
<div>
<div class="familylinks">
<div class="parentlink"><strong>Parent topic:</strong> <a href="dds_01_0021.html">System Architecture</a></div>
</div>
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<h1 class="topictitle1">DDS DB Instance</h1>
<div id="body66034349"></div>
<div>
<ul class="ullinks">
<li class="ulchildlink"><strong><a href="dds_01_0024.html">DB Instance Specifications</a></strong><br>
</li>
<li class="ulchildlink"><strong><a href="dds_01_0014.html">Database Engine and Version</a></strong><br>
</li>
<li class="ulchildlink"><strong><a href="dds_01_0026.html">Database Status</a></strong><br>
</li>
</ul>
<div class="familylinks">
<div class="parentlink"><strong>Parent topic:</strong> <a href="en-us_topic_user_guide.html">Introduction</a></div>
</div>
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<h1 class="topictitle1">Database Engine and Version</h1>
<div id="body51595365"><p id="dds_01_0014__p1125954420452">Currently, DDS is compatible with MongoDB 3.2 and 3.4 Community Edition and supports the WiredTiger storage engine, so you need to use a driver compatible with MongoDB 3.0 or later to access DDS.</p>
</div>
<div>
<div class="familylinks">
<div class="parentlink"><strong>Parent topic:</strong> <a href="dds_01_0013.html">DDS DB Instance</a></div>
</div>
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<h1 class="topictitle1">Typical Application Scenarios</h1>
<div id="body21887914"><ul id="dds_01_0015__ul22015940163129"><li id="dds_01_0015__li34139046163129"><strong id="dds_01_0015__b1946100409191721">Mobile Apps and Maps</strong><p id="dds_01_0015__p62430091163134">DDS supports two-dimensional space indexes for mobile applications (Apps) and maps that have location query requests. In addition, the dynamic storage mode of DDS is suitable for storing heterogeneous data of multiple systems, meeting the requirements of this scenario.</p>
</li><li id="dds_01_0015__li42145815163129"><strong id="dds_01_0015__b84235270619186">IoT</strong><p id="dds_01_0015__p474139163136">Internet of Things (IoT) applications generate terabytes of data and have high requirements on data write performance and low requirements on data read performance. DDS provides high write performance and shard-based DB instances to meet IoT requirements.</p>
</li><li id="dds_01_0015__li23256509163129"><strong id="dds_01_0015__b842352706193635">CMS</strong><p id="dds_01_0015__p20361690163138">Content management system (CMS) has a large amount of data and queries and the data is non-structured and diverse. <span id="dds_01_0015__text13695143135220">DDS</span> provides high performance Schema-free, GridFS, and shards to support CMS applications.</p>
</li><li id="dds_01_0015__li6001897163129"><strong id="dds_01_0015__b842352706165028">Game Industry</strong><p id="dds_01_0015__p23903516163132">DDS provides schema-free to meet ever-changing requirements in the gaming industry, shortening R&amp;D periods and reducing R&amp;D costs.</p>
</li></ul>
</div>
<div>
<div class="familylinks">
<div class="parentlink"><strong>Parent topic:</strong> <a href="en-us_topic_user_guide.html">Introduction</a></div>
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<h1 class="topictitle1">Related Services</h1>
<div id="body21484299"><div class="section" id="dds_01_0016__section27076184153244"><h4 class="sectiontitle">ECS</h4><p id="dds_01_0016__p52216486153724">ECS provides DDS with elastic computing resources. DDS needs to apply for resources from ECS to build a running environment for DB instances.</p>
<p id="dds_01_0016__p24174528153310">For more information, see the <em id="dds_01_0016__i84235269794635">Elastic Cloud Server User Guide</em>.</p>
</div>
<div class="section" id="dds_01_0016__section61732958153739"><h4 class="sectiontitle">EVS</h4><p id="dds_01_0016__p50907519153751">Elastic Volume Service (EVS) provides DDS with elastic storage resources. DDS needs to apply for resources from EVS to build a running environment for DB instances.</p>
<p id="dds_01_0016__p3421019715389">For more information, see the <em id="dds_01_0016__i84235269794716">Elastic Volume Service User Guide</em>.</p>
</div>
<div class="section" id="dds_01_0016__section12570197153928"><h4 class="sectiontitle">VPC</h4><p id="dds_01_0016__p36430164153951">Virtual Private Cloud (VPC) provides DDS with elastic network resources and implements network isolation and access control for your DB instances.</p>
<p id="dds_01_0016__p1631883154716">For more information, see the <em id="dds_01_0016__i842352697162817">Virtual Private Cloud User Guide</em>.</p>
</div>
<div class="section" id="dds_01_0016__section63179467154048"><h4 class="sectiontitle">OBS</h4><p id="dds_01_0016__p55438020154355">OBS stores your DDS DB instance backup files.</p>
<p id="dds_01_0016__p0416111718542">For more information, see the <em id="dds_01_0016__i969244684">Object Storage Service User Guide</em>.</p>
</div>
<div class="section" id="dds_01_0016__section1038386115490"><h4 class="sectiontitle">Cloud Eye</h4><p id="dds_01_0016__p24405891154936">Cloud Eye serves as a monitoring platform, monitoring DDS resources for you. Cloud Eye supports multiple alarm rules to ensure timely pre-warning and normal service running.</p>
<p id="dds_01_0016__p16440814155049">For more information, see the <em id="dds_01_0016__i84235269714222_3">Cloud Eye User Guide</em>.</p>
</div>
<div class="section" id="dds_01_0016__section12747782114445"><h4 class="sectiontitle">IAM</h4><p id="dds_01_0016__p4694432594530">Identity and Access Management (IAM) provides the permission management function for DDS.</p>
<p id="dds_01_0016__p1054201119298">For more information, see the <em id="dds_01_0016__i372029381105446">Identity and Access Management User Guide</em>.</p>
</div>
<div class="section" id="dds_01_0016__section11248384103457"><h4 class="sectiontitle">CTS</h4><p id="dds_01_0016__p3787666210534">Cloud Trace Service (CTS) records operations related to DDS, facilitating your further queries, audits, and retrievals.</p>
<p id="dds_01_0016__p28522244105157">For more information, see the <em id="dds_01_0016__i842352697174855">Cloud Trace Service User Guide</em>.</p>
</div>
</div>
<div>
<div class="familylinks">
<div class="parentlink"><strong>Parent topic:</strong> <a href="en-us_topic_user_guide.html">Introduction</a></div>
</div>
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<h1 class="topictitle1">User Permissions</h1>
<div id="body1522807551708"><p id="dds_01_0017__en-us_topic_0054095658_p168570320024">DDS provides two types of user permissions by default: user management and resource management.</p>
<ul id="dds_01_0017__u8f0eb25ba1514424bc2e77eb3f260387"><li id="dds_01_0017__l2e33a568e55c47aea44c75c2f5e02509">User management refers to the management of users, user groups, and user group rights.</li><li id="dds_01_0017__lf545eb5ff6ac4f9b925c510c02d92abc">Resource management refers to the control operations that can be performed by users on cloud service resources.</li></ul>
<p id="dds_01_0017__p64255115101012">For details, see <a href="https://docs.otc.t-systems.com/en-us/permissions/index.html" target="_blank" rel="noopener noreferrer">Permissions</a>.</p>
</div>
<div>
<div class="familylinks">
<div class="parentlink"><strong>Parent topic:</strong> <a href="en-us_topic_user_guide.html">Introduction</a></div>
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<h1 class="topictitle1">System Architecture</h1>
<div id="body1574653060557"><p id="dds_01_0021__p8060118"></p>
</div>
<div>
<ul class="ullinks">
<li class="ulchildlink"><strong><a href="dds_01_0011.html">Cluster Architecture</a></strong><br>
</li>
<li class="ulchildlink"><strong><a href="dds_01_0012.html">Replica Set Architecture</a></strong><br>
</li>
</ul>
<div class="familylinks">
<div class="parentlink"><strong>Parent topic:</strong> <a href="en-us_topic_user_guide.html">Introduction</a></div>
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<h1 class="topictitle1">DB Instance Specifications</h1>
<div id="body34564214"><p id="dds_01_0024__p19615830194312">DB instance specifications are listed in the following table.</p>
<div class="note" id="dds_01_0024__note1167815161239"><img src="public_sys-resources/note_3.0-en-us.png"><span class="notetitle"> </span><div class="notebody"><p id="dds_01_0024__p5678101611238">DB instance specifications vary depending on the actual environment. </p>
</div></div>
<div class="section" id="dds_01_0024__section87233314314"><h4 class="sectiontitle">Cluster</h4><p id="dds_01_0024__p14352166412">For details about the cluster instance specifications, see <a href="#dds_01_0024__table147993911564">Table 1</a> and <a href="#dds_01_0024__table196721422132317">Table 2</a>.</p>
<div class="tablenoborder"><a name="dds_01_0024__table147993911564"></a><a name="table147993911564"></a><table cellpadding="4" cellspacing="0" summary="" id="dds_01_0024__table147993911564" frame="border" border="1" rules="all"><caption><b>Table 1 </b>config specifications</caption><thead align="left"><tr id="dds_01_0024__row227118761564"><th align="left" class="cellrowborder" valign="top" width="34.11658834116588%" id="mcps1.3.3.3.2.4.1.1"><p id="dds_01_0024__p100389351564"><strong id="dds_01_0024__b842352706163428_1_1">Number of vCPUs</strong></p>
</th>
<th align="left" class="cellrowborder" valign="top" width="33.186681331866815%" id="mcps1.3.3.3.2.4.1.2"><p id="dds_01_0024__p4247505104341"><strong id="dds_01_0024__b8423527069107_1_1">Memory (GB)</strong></p>
</th>
<th align="left" class="cellrowborder" valign="top" width="32.696730326967305%" id="mcps1.3.3.3.2.4.1.3"><p id="dds_01_0024__p78473681564"><strong id="dds_01_0024__b842352706184638_1">Max. Number of Connections</strong></p>
</th>
</tr>
</thead>
<tbody><tr id="dds_01_0024__row490116301564"><td class="cellrowborder" valign="top" width="34.11658834116588%" headers="mcps1.3.3.3.2.4.1.1 "><p id="dds_01_0024__p467409141564">2</p>
</td>
<td class="cellrowborder" valign="top" width="33.186681331866815%" headers="mcps1.3.3.3.2.4.1.2 "><p id="dds_01_0024__p8503630104341">4</p>
</td>
<td class="cellrowborder" valign="top" width="32.696730326967305%" headers="mcps1.3.3.3.2.4.1.3 "><p id="dds_01_0024__p279176831564">1000</p>
</td>
</tr>
</tbody>
</table>
</div>
<div class="tablenoborder"><a name="dds_01_0024__table196721422132317"></a><a name="table196721422132317"></a><table cellpadding="4" cellspacing="0" summary="" id="dds_01_0024__table196721422132317" frame="border" border="1" rules="all"><caption><b>Table 2 </b>shard and mongos specifications</caption><thead align="left"><tr id="dds_01_0024__row1367852222320"><th align="left" class="cellrowborder" valign="top" width="34.11658834116588%" id="mcps1.3.3.4.2.4.1.1"><p id="dds_01_0024__p1067902210235"><strong id="dds_01_0024__b842352706163428_3">Number of vCPUs</strong></p>
</th>
<th align="left" class="cellrowborder" valign="top" width="34.126587341265875%" id="mcps1.3.3.4.2.4.1.2"><p id="dds_01_0024__p1768272262318"><strong id="dds_01_0024__b8423527069107_1_3">Memory (GB)</strong></p>
</th>
<th align="left" class="cellrowborder" valign="top" width="31.756824317568245%" id="mcps1.3.3.4.2.4.1.3"><p id="dds_01_0024__p468412220230"><strong id="dds_01_0024__b842352706184638_3_1">Max. Number of Connections</strong></p>
</th>
</tr>
</thead>
<tbody><tr id="dds_01_0024__row17685182218237"><td class="cellrowborder" valign="top" width="34.11658834116588%" headers="mcps1.3.3.4.2.4.1.1 "><p id="dds_01_0024__p12686192211232">1</p>
</td>
<td class="cellrowborder" valign="top" width="34.126587341265875%" headers="mcps1.3.3.4.2.4.1.2 "><p id="dds_01_0024__p26871822172313">4</p>
</td>
<td class="cellrowborder" valign="top" width="31.756824317568245%" headers="mcps1.3.3.4.2.4.1.3 "><p id="dds_01_0024__p56881322132320">400</p>
</td>
</tr>
<tr id="dds_01_0024__row9689122122319"><td class="cellrowborder" valign="top" width="34.11658834116588%" headers="mcps1.3.3.4.2.4.1.1 "><p id="dds_01_0024__p126931422112316">2</p>
</td>
<td class="cellrowborder" valign="top" width="34.126587341265875%" headers="mcps1.3.3.4.2.4.1.2 "><p id="dds_01_0024__p5694102216237">8</p>
</td>
<td class="cellrowborder" valign="top" width="31.756824317568245%" headers="mcps1.3.3.4.2.4.1.3 "><p id="dds_01_0024__p7696142272310">400</p>
</td>
</tr>
<tr id="dds_01_0024__row6697202292311"><td class="cellrowborder" valign="top" width="34.11658834116588%" headers="mcps1.3.3.4.2.4.1.1 "><p id="dds_01_0024__p56981622162312">4</p>
</td>
<td class="cellrowborder" valign="top" width="34.126587341265875%" headers="mcps1.3.3.4.2.4.1.2 "><p id="dds_01_0024__p2070014222234">16</p>
</td>
<td class="cellrowborder" valign="top" width="31.756824317568245%" headers="mcps1.3.3.4.2.4.1.3 "><p id="dds_01_0024__p170214226232">1000</p>
</td>
</tr>
<tr id="dds_01_0024__row107031822142311"><td class="cellrowborder" valign="top" width="34.11658834116588%" headers="mcps1.3.3.4.2.4.1.1 "><p id="dds_01_0024__p117061922152317">8</p>
</td>
<td class="cellrowborder" valign="top" width="34.126587341265875%" headers="mcps1.3.3.4.2.4.1.2 "><p id="dds_01_0024__p97081022152316">32</p>
</td>
<td class="cellrowborder" valign="top" width="31.756824317568245%" headers="mcps1.3.3.4.2.4.1.3 "><p id="dds_01_0024__p3711922142316">4000</p>
</td>
</tr>
<tr id="dds_01_0024__row671232242315"><td class="cellrowborder" valign="top" width="34.11658834116588%" headers="mcps1.3.3.4.2.4.1.1 "><p id="dds_01_0024__p771592282313">16</p>
</td>
<td class="cellrowborder" valign="top" width="34.126587341265875%" headers="mcps1.3.3.4.2.4.1.2 "><p id="dds_01_0024__p6717182213232">64</p>
</td>
<td class="cellrowborder" valign="top" width="31.756824317568245%" headers="mcps1.3.3.4.2.4.1.3 "><p id="dds_01_0024__p18719192262313">8000</p>
</td>
</tr>
</tbody>
</table>
</div>
</div>
<div class="section" id="dds_01_0024__section360115715426"><h4 class="sectiontitle">Replica Set</h4><p id="dds_01_0024__p5679193518185">The supported replica set specifications are the same as those of shard and mongos nodes. For details, see <a href="#dds_01_0024__table196721422132317">Table 2</a>.</p>
</div>
</div>
<div>
<div class="familylinks">
<div class="parentlink"><strong>Parent topic:</strong> <a href="dds_01_0013.html">DDS DB Instance</a></div>
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<h1 class="topictitle1">Regions and AZs</h1>
<div id="body1511510332269"><p id="dds_01_0027__p0522201215253">A region is a geographic area in which resources used by DDS are located.</p>
<p id="dds_01_0027__p50892465165029">Each region comprises one or more AZs and is completely isolated from other regions. AZs within the same region can communicate with one another through an internal network, while those in different regions cannot communicate with one another through an internal network.</p>
<p id="dds_01_0027__p91315267277">Public cloud data centers are deployed worldwide. <span id="dds_01_0027__text1593513910362">DDS</span> applies to different regions. Provisioning DDS to specific regions can better meet user requirements. For example, applications can be designed to better meet specific user requirements or comply with local laws and other demands.</p>
<p id="dds_01_0027__p14131112642720">Each region contains many AZs where power and networks are physically isolated. AZs in the same region can communicate with each other over an intranet. Each AZ provides cost-effective and low-latency network connections that are unaffected by faults in other AZs. As a result, provisioning DDS in separate AZs protects your applications against local faults that occur in a single location. DDS supports the deployment of a replica set instance across three AZs. It means that the primary, secondary, and hidden nodes are deployed in three AZs for disaster recovery.</p>
</div>
<div>
<div class="familylinks">
<div class="parentlink"><strong>Parent topic:</strong> <a href="dds_01_0001.html">Basic Concepts</a></div>
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<h1 class="topictitle1">Restrictions</h1>
<div id="body1522808547321"><p id="dds_02_0002__p48042784123325">To improve the stability and security of DB instances, there are some restrictions on the use of DDS. For details, see <a href="#dds_02_0002__table60364850123535">Table 1</a>.</p>
<div class="tablenoborder"><a name="dds_02_0002__table60364850123535"></a><a name="table60364850123535"></a><table cellpadding="4" cellspacing="0" summary="" id="dds_02_0002__table60364850123535" frame="border" border="1" rules="all"><caption><b>Table 1 </b>Function restrictions</caption><thead align="left"><tr id="dds_02_0002__row63835418123535"><th align="left" class="cellrowborder" valign="top" width="27.26%" id="mcps1.3.2.2.3.1.1"><p id="dds_02_0002__p3286360123535"><strong id="dds_02_0002__b29577244123535">Operation</strong></p>
</th>
<th align="left" class="cellrowborder" valign="top" width="72.74000000000001%" id="mcps1.3.2.2.3.1.2"><p id="dds_02_0002__p46946588123535"><strong id="dds_02_0002__b842352706171539">Restrictions</strong></p>
</th>
</tr>
</thead>
<tbody><tr id="dds_02_0002__row65651390123535"><td class="cellrowborder" valign="top" width="27.26%" headers="mcps1.3.2.2.3.1.1 "><p id="dds_02_0002__p16162334123535">Connecting to a DB instance through a client</p>
</td>
<td class="cellrowborder" valign="top" width="72.74000000000001%" headers="mcps1.3.2.2.3.1.2 "><ul id="dds_02_0002__ul53814073144559"><li id="dds_02_0002__li109347144559">To access a <span class="keyword" id="dds_02_0002__keyword159551725101016">DDS DB instance</span> which is not publicly accessible from an ECS, the instance must be in the same VPC subnet as the ECS.</li><li id="dds_02_0002__li46337654144559">By default, DDS cannot be accessed through an ECS in a different security group. You need to add an inbound rule to the DDS security group.</li><li id="dds_02_0002__li29581666144559">The default DDS port number is 8635. You can change it if you want to access DDS through another port.</li></ul>
</td>
</tr>
<tr id="dds_02_0002__row53074217123535"><td class="cellrowborder" valign="top" width="27.26%" headers="mcps1.3.2.2.3.1.1 "><p id="dds_02_0002__p4044355123535">Deployment</p>
</td>
<td class="cellrowborder" valign="top" width="72.74000000000001%" headers="mcps1.3.2.2.3.1.2 "><p id="dds_02_0002__p41829298123535">ECSs in which DB instances are deployed are not visible to you. Your applications can access the database only through an IP address and port.</p>
</td>
</tr>
<tr id="dds_02_0002__row60017787123535"><td class="cellrowborder" valign="top" width="27.26%" headers="mcps1.3.2.2.3.1.1 "><p id="dds_02_0002__p29602599123535">Obtaining permissions of user <strong id="dds_02_0002__b84235270617431">rwuser</strong></p>
</td>
<td class="cellrowborder" valign="top" width="72.74000000000001%" headers="mcps1.3.2.2.3.1.2 "><p id="dds_02_0002__p738283513565">Only the <strong id="dds_02_0002__en-us_topic_0105284934_b84235270694322">rwuser</strong> user permissions are provided on the instance creation page.</p>
<p id="dds_02_0002__p1716401218589">For details about the related commands, see <a href="dds_faq_0033.html">Which Commands are Supported or Restricted by DDS?</a></p>
</td>
</tr>
<tr id="dds_02_0002__row62985361123535"><td class="cellrowborder" valign="top" width="27.26%" headers="mcps1.3.2.2.3.1.1 "><p id="dds_02_0002__p1540641123535">Setting database parameters</p>
</td>
<td class="cellrowborder" valign="top" width="72.74000000000001%" headers="mcps1.3.2.2.3.1.2 "><p id="dds_02_0002__p3859309423"></p>
<p id="dds_02_0002__p159333074217"></p>
<p id="dds_02_0002__p109814306422">Most database parameters in the parameter groups you created can be modified. For details, see section <a href="en-us_topic_configuration.html">Editing a Parameter Group</a>.</p>
<p id="dds_02_0002__p51021730164220"></p>
</td>
</tr>
<tr id="dds_02_0002__row19812839123535"><td class="cellrowborder" valign="top" width="27.26%" headers="mcps1.3.2.2.3.1.1 "><p id="dds_02_0002__p61336152123535">Migrating data</p>
</td>
<td class="cellrowborder" valign="top" width="72.74000000000001%" headers="mcps1.3.2.2.3.1.2 "><p id="dds_02_0002__p52021072133834">You can use command line tools, including mongoexport and mongoimport, to migrate data. For details, see section <a href="dds_03_0052.html">Migrating Data</a>.</p>
</td>
</tr>
<tr id="dds_02_0002__row18357798134159"><td class="cellrowborder" valign="top" width="27.26%" headers="mcps1.3.2.2.3.1.1 "><p id="dds_02_0002__p255375813428">Storage engine</p>
</td>
<td class="cellrowborder" valign="top" width="72.74000000000001%" headers="mcps1.3.2.2.3.1.2 "><p id="dds_02_0002__p2528698134215">The WiredTiger storage engine is supported.</p>
</td>
</tr>
<tr id="dds_02_0002__row43544108123535"><td class="cellrowborder" valign="top" width="27.26%" headers="mcps1.3.2.2.3.1.1 "><p id="dds_02_0002__p37411822123535">Restarting a DB instance or a node</p>
</td>
<td class="cellrowborder" valign="top" width="72.74000000000001%" headers="mcps1.3.2.2.3.1.2 "><p id="dds_02_0002__p41132837123535">A DDS DB instance must be restarted on the DDS console.</p>
</td>
</tr>
<tr id="dds_02_0002__row27804808123535"><td class="cellrowborder" valign="top" width="27.26%" headers="mcps1.3.2.2.3.1.1 "><p id="dds_02_0002__p37597003123535">Viewing DDS backup files</p>
</td>
<td class="cellrowborder" valign="top" width="72.74000000000001%" headers="mcps1.3.2.2.3.1.2 "><p id="dds_02_0002__p63693518173">You can download and view the backup files on the DDS console. For details, see section <a href="en-us_topic_backup_download.html">Downloading Backup Files</a>.</p>
</td>
</tr>
</tbody>
</table>
</div>
</div>
<div>
<div class="familylinks">
<div class="parentlink"><strong>Parent topic:</strong> <a href="dds_02_cluster.html">Getting Started with Clusters</a></div>
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<h1 class="topictitle1">Service Process</h1>
<div id="body1522808547321"><p id="dds_02_0003__p8514761141515">This section describes how to create a cluster instance, set a security group, and connect to a cluster instance.</p>
<div class="section" id="dds_02_0003__section15744754141943"><h4 class="sectiontitle">Intended Audience</h4><ul id="dds_02_0003__ul3823213891623"><li id="dds_02_0003__li3530047291644">Users who create the DDS DB instance for the first time.</li><li id="dds_02_0003__li5410008191623">Users who need to perform the initial configuration after a DB instance is created.</li><li id="dds_02_0003__li2821380891638">Users who want to know how to connect to the DDS DB instances.</li></ul>
</div>
<div class="section" id="dds_02_0003__section10506471114332"><h4 class="sectiontitle">Process</h4><p id="dds_02_0003__p18714184141515">The following describes the steps from creating a DB instance to using it.</p>
<div class="fignone" id="dds_02_0003__fig34101010182111"><span class="figcap"><b>Figure 1 </b>Accessing DB instances from a public network</span><br><span><img id="dds_02_0003__image1841001014216" src="en-us_image_0284274985.png"></span></div>
<div class="fignone" id="dds_02_0003__fig622427152416"><span class="figcap"><b>Figure 2 </b>Accessing DB instances from a private network</span><br><span><img id="dds_02_0003__image422447152412" src="en-us_image_0284275243.png"></span></div>
</div>
</div>
<div>
<div class="familylinks">
<div class="parentlink"><strong>Parent topic:</strong> <a href="dds_02_cluster.html">Getting Started with Clusters</a></div>
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<h1 class="topictitle1">Setting a Security Group</h1>
<div id="body1522808547321"><div class="section" id="dds_02_0005__section3152058916230"><h4 class="sectiontitle">Scenarios</h4><p id="dds_02_0005__p43222116204125">This section guides you on how to add a security group rule to control access from and to <span class="keyword" id="dds_02_0005__keyword943913121715">DDS DB instances</span> in a security group.</p>
</div>
<div class="section" id="dds_02_0005__section1282916720425"><h4 class="sectiontitle">Background Information</h4><p id="dds_02_0005__p27630095204125">You can access a DDS DB instance in either of the following ways:</p>
<ul id="dds_02_0005__ul47344269204125"><li id="dds_02_0005__li23445242204125">Public network</li><li id="dds_02_0005__li10720689204125">Internal network</li></ul>
</div>
<div class="section" id="dds_02_0005__section14550984204232"><h4 class="sectiontitle">Precautions</h4><p id="dds_02_0005__p5854544204125">The default security group rule allows all outgoing data packets. ECSs and DDS DB instances can access each other in the same security group. After a security group is created, you can add security group rules to control the access from and to the DDS DB instances in the security group.</p>
<p id="dds_02_0005__p1012315204125">By default, a tenant can create a maximum of 500 security group rules. An excessive number of security group rules increases the network latency of the first packet. It is recommended that you add a maximum of 50 rules for each security group.</p>
<p id="dds_02_0005__p41200900204125">To access the DDS DB instances in a security group from external resources, create an inbound rule for the security group.</p>
</div>
<div class="section" id="dds_02_0005__section25078651204428"><h4 class="sectiontitle"><strong id="dds_02_0005__b15424473204153">Procedure</strong></h4><ol id="dds_02_0005__ol49383781586"><li id="dds_02_0005__li93899141586"><span>Log in to the management console.</span></li><li id="dds_02_0005__li1870917810588"><span>Click <span><img id="dds_02_0005__image070916845819" src="en-us_image_0284275123.png"></span> in the upper left corner and select a region and project.</span></li><li id="dds_02_0005__li297543615857"><span>Click <strong id="dds_02_0005__b10763925113313">Service List</strong>. Under <strong id="dds_02_0005__b842352706191157">Network</strong>, click <strong id="dds_02_0005__b84235270619120">Virtual Private Cloud</strong>.</span></li><li id="dds_02_0005__li3171015115916"><span>In the navigation pane on the left, choose <strong id="dds_02_0005__b18843268317">Access Control</strong> &gt; <strong id="dds_02_0005__b188862267314">Security Groups</strong>.</span></li><li id="dds_02_0005__li140569415930"><span>On the <strong id="dds_02_0005__b9169741348">Security Group</strong> page, click the security group name.</span></li><li id="dds_02_0005__li5489049115946"><span>On the <strong id="dds_02_0005__b156479192710">Inbound Rules</strong> tab, click <strong id="dds_02_0005__b842352706174533">Add Rule</strong>. In the displayed <strong id="dds_02_0005__b84235270617460">Add Inbound Rule</strong> dialog box, set required parameters to add inbound rules. On the <strong id="dds_02_0005__b842352706155549">Outbound Rules</strong> tab, click <strong id="dds_02_0005__b84235270615562">Add Rule</strong>. In the displayed <strong id="dds_02_0005__b64452812619">Add Outbound Rule</strong> dialog box, set required parameters to add outbound rules.</span></li><li id="dds_02_0005__li6900819151212"><span>Add a security group rule as prompted.</span><p>
<div class="tablenoborder"><table cellpadding="4" cellspacing="0" summary="" id="dds_02_0005__en-us_topic_0118534005_table532116198213" width="90%" frame="border" border="1" rules="all"><caption><b>Table 1 </b>Field description</caption><thead align="left"><tr id="dds_02_0005__en-us_topic_0118534005_row731911191722"><th align="left" class="cellrowborder" valign="top" width="19%" id="mcps1.3.4.2.7.2.1.2.4.1.1"><p id="dds_02_0005__en-us_topic_0118534005_p17319119020"><strong id="dds_02_0005__b6507101123818">Parameter</strong></p>
</th>
<th align="left" class="cellrowborder" valign="top" width="63%" id="mcps1.3.4.2.7.2.1.2.4.1.2"><p id="dds_02_0005__en-us_topic_0118534005_p431911191622"><strong id="dds_02_0005__b1979812213380">Description</strong></p>
</th>
<th align="left" class="cellrowborder" valign="top" width="18%" id="mcps1.3.4.2.7.2.1.2.4.1.3"><p id="dds_02_0005__en-us_topic_0118534005_p103191119621"><strong id="dds_02_0005__b84235270617550">Value Example</strong></p>
</th>
</tr>
</thead>
<tbody><tr id="dds_02_0005__en-us_topic_0118534005_row8320419723"><td class="cellrowborder" valign="top" width="19%" headers="mcps1.3.4.2.7.2.1.2.4.1.1 "><p id="dds_02_0005__en-us_topic_0118534005_p1432013199214">Protocol</p>
</td>
<td class="cellrowborder" valign="top" width="63%" headers="mcps1.3.4.2.7.2.1.2.4.1.2 "><p id="dds_02_0005__en-us_topic_0118534005_p432017191726">Specifies the network protocol. Allows all traffic or supports user-defined protocols, TCP, UDP, ICMP, and SSH.</p>
</td>
<td class="cellrowborder" valign="top" width="18%" headers="mcps1.3.4.2.7.2.1.2.4.1.3 "><p id="dds_02_0005__en-us_topic_0118534005_p1332014191216">TCP</p>
</td>
</tr>
<tr id="dds_02_0005__row15380125810476"><td class="cellrowborder" valign="top" width="19%" headers="mcps1.3.4.2.7.2.1.2.4.1.1 "><p id="dds_02_0005__p1538118582479">Port</p>
</td>
<td class="cellrowborder" valign="top" width="63%" headers="mcps1.3.4.2.7.2.1.2.4.1.2 "><p id="dds_02_0005__p1391312104488">Specifies the port allowing the access to ECSs or external devices. </p>
</td>
<td class="cellrowborder" valign="top" width="18%" headers="mcps1.3.4.2.7.2.1.2.4.1.3 "><p id="dds_02_0005__p1438118583479">8635</p>
</td>
</tr>
<tr id="dds_02_0005__en-us_topic_0118534005_row1732101910217"><td class="cellrowborder" valign="top" width="19%" headers="mcps1.3.4.2.7.2.1.2.4.1.1 "><p id="dds_02_0005__en-us_topic_0118534005_p16320131918211">Source/Destination</p>
</td>
<td class="cellrowborder" valign="top" width="63%" headers="mcps1.3.4.2.7.2.1.2.4.1.2 "><p id="dds_02_0005__p1953711281854">Specifies the supported IP address and security group.</p>
<ul id="dds_02_0005__en-us_topic_0118534005_ul474117187016"><li id="dds_02_0005__li204213179474"><strong id="dds_02_0005__b812614895114">IP address</strong>: indicates that the security group rule takes effect in a specified IP address range.<ul id="dds_02_0005__ul67881445105111"><li id="dds_02_0005__en-us_topic_0118534005_li87410184011">xxx.xxx.xxx.xxx/32 (IPv4)</li><li id="dds_02_0005__en-us_topic_0118534005_li1374113189012">xxx.xxx.xxx.0/24 (subnet)</li><li id="dds_02_0005__en-us_topic_0118534005_li167411218306">0.0.0.0/0 (any IP address)</li></ul>
</li><li id="dds_02_0005__li1390210401514"><strong id="dds_02_0005__b71025536519">Security group</strong>: indicates that this rule allows all IP addresses of ECSs to access DDS DB instances in the same specified security group.</li></ul>
</td>
<td class="cellrowborder" valign="top" width="18%" headers="mcps1.3.4.2.7.2.1.2.4.1.3 "><ul id="dds_02_0005__ul209321608538"><li id="dds_02_0005__li119329015535">192.168.10.0/24</li><li id="dds_02_0005__li209327055311">default</li></ul>
</td>
</tr>
</tbody>
</table>
</div>
</p></li><li id="dds_02_0005__li21369327151121"><span>Click <strong id="dds_02_0005__b842352706113845">OK</strong>.</span></li></ol>
</div>
</div>
<div>
<div class="familylinks">
<div class="parentlink"><strong>Parent topic:</strong> <a href="dds_02_cluster.html">Getting Started with Clusters</a></div>
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<h1 class="topictitle1">Binding and Unbinding an EIP</h1>
<div id="body1522136462404"><div class="section" id="dds_02_0006__section055104935914"><a name="dds_02_0006__section055104935914"></a><a name="section055104935914"></a><h4 class="sectiontitle"><strong id="dds_02_0006__b10875147182618">Scenarios</strong></h4><p id="dds_02_0006__p6551149135917">You can access DDS through a private IP address or an EIP. The application scenario of the connection address is as follows:</p>
<ul id="dds_02_0006__ul115584945912"><li id="dds_02_0006__li14552049185915">Use a private IP address when:<p id="dds_02_0006__p12551049155916"><a name="dds_02_0006__li14552049185915"></a><a name="li14552049185915"></a>DDS provides a private IP address by default.</p>
<p id="dds_02_0006__p75510491599">Your applications are deployed on an ECS in a region where your cluster instance is located.</p>
</li></ul>
<ul id="dds_02_0006__ul1855449105913"><li id="dds_02_0006__li135514925912">Use an EIP when:<ul id="dds_02_0006__ul125516499595"><li id="dds_02_0006__li255104965916">Your applications are deployed on an ECS in a region separated from the region where your cluster instance is located.</li><li id="dds_02_0006__li65544917591">Your applications are deployed on another cloud platform.</li></ul>
</li></ul>
</div>
<div class="section" id="dds_02_0006__section1130510262514"><h4 class="sectiontitle">Precautions</h4><ul id="dds_02_0006__ul15712132844"><li id="dds_02_0006__li13712152748">Before accessing a database, you need to apply for an EIP on the VPC console. Then, add an inbound rule to allow the IP addresses or IP address ranges of ECSs. For details, see section <a href="dds_02_0005.html">Setting a Security Group</a>.</li><li id="dds_02_0006__li137122023418">In the cluster instance, only mongos can be bound to an EIP. To change the EIP that has been bound to a node, you need to unbind it from the node first.</li></ul>
</div>
<div class="section" id="dds_02_0006__section0463161611514"><a name="dds_02_0006__section0463161611514"></a><a name="section0463161611514"></a><h4 class="sectiontitle">Binding an EIP</h4><ol id="dds_02_0006__ol12603704105129"><li id="dds_02_0006__li46324476105129"><span>On the <strong id="dds_02_0006__b84235270615219">Instance Management</strong> page, click the target cluster instance.</span></li><li id="dds_02_0006__li349825362319"><span>In the navigation pane on the left, choose <span class="uicontrol" id="dds_02_0006__uicontrol4786037163118"><b>Connections</b></span>. </span></li><li id="dds_02_0006__li38329011165953"><span>In the <strong id="dds_02_0006__b17715154217247">Basic Information</strong> area, locate the target mongos node and click <strong id="dds_02_0006__b1971744216246">Bind EIP</strong> in the <strong id="dds_02_0006__b15719154214242">Operation</strong> column.</span></li><li id="dds_02_0006__li14267104105129"><span>In the displayed dialog box, all EIPs in the unbound status are listed. Select the required EIP and click <strong id="dds_02_0006__b842352706204348">OK</strong>. If no available EIPs are displayed, click <span class="uicontrol" id="dds_02_0006__uicontrol64968849151523"><b>View EIP</b></span> and create an EIP on the VPC console.</span></li><li id="dds_02_0006__li17560260102159"><span>In the <strong id="dds_02_0006__b842352706105036">EIP</strong> column on the <strong id="dds_02_0006__b842352706105039">mongos</strong> tab, view the EIP that is successfully bound.</span><p><p id="dds_02_0006__p32760134103252">To unbind an EIP from the DB instance, see <a href="#dds_02_0006__section1139494151519">Unbinding an EIP</a>.</p>
</p></li></ol>
</div>
<div class="section" id="dds_02_0006__section1139494151519"><a name="dds_02_0006__section1139494151519"></a><a name="section1139494151519"></a><h4 class="sectiontitle">Unbinding an EIP</h4><ol id="dds_02_0006__ol31276680102616"><li id="dds_02_0006__li35235350102616"><span>On the <strong id="dds_02_0006__b34027572411917">Instance Management</strong> page, click the target cluster instance.</span></li><li id="dds_02_0006__li15539153193217"><span>In the navigation pane on the left, choose <span class="uicontrol" id="dds_02_0006__uicontrol17211152912257"><b>Connections</b></span>. </span></li><li id="dds_02_0006__li417442102629"><span>In the <strong id="dds_02_0006__b1757933115255">Basic Information</strong> area, locate the target mongos node and click <strong id="dds_02_0006__b85791731142520">Unbind EIP</strong> in the <strong id="dds_02_0006__b11580183111252">Operation</strong> column.</span></li><li id="dds_02_0006__li56439840102720"><span>In the displayed dialog box, click <strong id="dds_02_0006__b9698561399">OK</strong> to unbind the EIP.</span><p><p id="dds_02_0006__p21771104103056">To bind an EIP to the DB instance again, see <a href="#dds_02_0006__section0463161611514">Binding an EIP</a>.</p>
</p></li></ol>
</div>
</div>
<div>
<div class="familylinks">
<div class="parentlink"><strong>Parent topic:</strong> <a href="dds_02_0009.html">Connecting to a Cluster Instance</a></div>
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<h1 class="topictitle1">Enabling or Disabling SSL</h1>
<div id="body1511603910214"><div class="section" id="dds_02_0007__section4282820218710"><h4 class="sectiontitle"><strong id="dds_02_0007__b84235270694112">Scenarios</strong></h4><p id="dds_02_0007__p1784719017443"><span id="dds_02_0007__text198478084416">DDS</span> allows you to use SSL to encrypt connections to a DB instance to protect your data.</p>
<ul id="dds_02_0007__ul76031313134419"><li id="dds_02_0007__li13603141324418">If SSL is enabled, you can connect to a database using SSL. For details, see <a href="en-us_topic_0044018334.html#en-us_topic_0044018334__section1640311061419">SSL Connection</a>.</li><li id="dds_02_0007__li260341314446">If SSL is disabled, you can connect to the database using a common connection. For details, see <a href="en-us_topic_0044018334.html#en-us_topic_0044018334__sfc3bfb212a8440799f49320d91fc096c">Common Connection</a>.</li></ul>
<div class="notice" id="dds_02_0007__note31049471182749"><span class="noticetitle"><img src="public_sys-resources/notice_3.0-en-us.png"> </span><div class="noticebody"><p id="dds_02_0007__p11009784182749">Enabling or disabling SSL will cause DB instance restart. Exercise caution when you perform this operation.</p>
</div></div>
</div>
<div class="section" id="dds_02_0007__section135517584317"><h4 class="sectiontitle">Enabling SSL</h4><ol id="dds_02_0007__en-us_topic_0085468614_en-us_topic_0049044698_ol36506495172844"><li id="dds_02_0007__en-us_topic_0085468614_en-us_topic_0049044698_li61161897172844"><span>On the <strong id="dds_02_0007__en-us_topic_0085468614_b1395510445455">Instance Management</strong> page, click the target DB instance.</span></li><li id="dds_02_0007__en-us_topic_0085468614_li576685910510"><span>In the <strong id="dds_02_0007__en-us_topic_0085468614_b1929598181">DB Information</strong> area on the <strong id="dds_02_0007__en-us_topic_0085468614_b67196116198">Basic Information</strong> page, click <span><img id="dds_02_0007__en-us_topic_0085468614_image1847961425415" src="en-us_image_0271492125.png"></span> to enable SSL in the <strong id="dds_02_0007__en-us_topic_0085468614_b06371111912">SSL</strong> field.</span><p><p id="dds_02_0007__en-us_topic_0085468614_p12275153529">Alternatively, in the navigation pane on the left, choose <strong id="dds_02_0007__en-us_topic_0085468614_b1846159103217">Connections</strong>. In the <strong id="dds_02_0007__en-us_topic_0085468614_b2244257162410">Basic Information</strong> area, click <span><img id="dds_02_0007__en-us_topic_0085468614_image109241039174016" src="en-us_image_0269983210.png"></span> next to the <strong id="dds_02_0007__en-us_topic_0085468614_b1824625782413">SSL</strong> field.</p>
</p></li><li id="dds_02_0007__en-us_topic_0085468614_li6565827163611"><span>In the displayed dialog box, click <strong id="dds_02_0007__en-us_topic_0085468614_b842352706113027">Yes</strong>.</span></li><li id="dds_02_0007__en-us_topic_0085468614_li8198418174048"><span>In the <span class="uicontrol" id="dds_02_0007__en-us_topic_0085468614_uicontrol97835057310161"><b>Basic Information</b></span> area, view the modification result.</span></li></ol>
</div>
<div class="section" id="dds_02_0007__section10934168947"><a name="dds_02_0007__section10934168947"></a><a name="section10934168947"></a><h4 class="sectiontitle">Disabling SSL</h4><ol id="dds_02_0007__en-us_topic_0085468614_ol17873318277"><li id="dds_02_0007__en-us_topic_0085468614_li160859818277"><span>On the <strong id="dds_02_0007__en-us_topic_0085468614_b1372712531524">Instance Management</strong> page, click the target DB instance.</span></li><li id="dds_02_0007__en-us_topic_0085468614_li793217201703"><span>In the <strong id="dds_02_0007__en-us_topic_0085468614_b1686123112015">DB Information</strong> area on the <strong id="dds_02_0007__en-us_topic_0085468614_b166871931709">Basic Information</strong> page, click <span><img id="dds_02_0007__en-us_topic_0085468614_image996484913015" src="en-us_image_0271515223.png"></span> to enable SSL in the <strong id="dds_02_0007__en-us_topic_0085468614_b868818318018">SSL</strong> field.</span><p><p id="dds_02_0007__en-us_topic_0085468614_p199346205012">Alternatively, in the navigation pane on the left, choose <strong id="dds_02_0007__en-us_topic_0085468614_b1320310387015">Connections</strong>. In the <strong id="dds_02_0007__en-us_topic_0085468614_b626815411001">Basic Information</strong> area, click <span><img id="dds_02_0007__en-us_topic_0085468614_image3542175314013" src="en-us_image_0271515222.png"></span> next to the <strong id="dds_02_0007__en-us_topic_0085468614_b726924110013">SSL</strong> field.</p>
</p></li><li id="dds_02_0007__en-us_topic_0085468614_li758519119381"><span>In the displayed dialog box, click <strong id="dds_02_0007__en-us_topic_0085468614_b1290823424">Yes</strong>.</span></li><li id="dds_02_0007__en-us_topic_0085468614_li34492814174353"><span>In the <span class="uicontrol" id="dds_02_0007__en-us_topic_0085468614_uicontrol97611957203612"><b>Basic Information</b></span> area, view the modification result.</span></li></ol>
</div>
</div>
<div>
<div class="familylinks">
<div class="parentlink"><strong>Parent topic:</strong> <a href="dds_02_0009.html">Connecting to a Cluster Instance</a></div>
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<h1 class="topictitle1">Connecting to a Cluster Instance</h1>
<div id="body1522808547321"><p id="dds_02_0009__p8060118"></p>
</div>
<div>
<ul class="ullinks">
<li class="ulchildlink"><strong><a href="dds_02_0006.html">Binding and Unbinding an EIP</a></strong><br>
</li>
<li class="ulchildlink"><strong><a href="dds_02_0007.html">Enabling or Disabling SSL</a></strong><br>
</li>
<li class="ulchildlink"><strong><a href="en-us_topic_0044018334.html">Connecting to a DB Instance Through a Client</a></strong><br>
</li>
</ul>
<div class="familylinks">
<div class="parentlink"><strong>Parent topic:</strong> <a href="dds_02_cluster.html">Getting Started with Clusters</a></div>
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<h1 class="topictitle1">Service Process</h1>
<div id="body1522808547322"><p id="dds_02_0010__p8514761141515">This section describes how to create a replica set instance, set a security group, and connect to a replica set instance.</p>
<div class="section" id="dds_02_0010__en-us_topic_0105284935_section15744754141943"><h4 class="sectiontitle">Intended Audience</h4><ul id="dds_02_0010__en-us_topic_0105284935_ul3823213891623"><li id="dds_02_0010__en-us_topic_0105284935_li3530047291644">Users who create the DDS DB instance for the first time.</li><li id="dds_02_0010__en-us_topic_0105284935_li5410008191623">Users who need to perform the initial configuration after a DB instance is created.</li><li id="dds_02_0010__en-us_topic_0105284935_li2821380891638">Users who want to know how to connect to the DDS DB instances.</li></ul>
</div>
<div class="section" id="dds_02_0010__en-us_topic_0105284935_section10506471114332"><h4 class="sectiontitle">Service Process</h4><p id="dds_02_0010__en-us_topic_0105284935_p18714184141515">The following describes the steps from creating a DB instance to using it.</p>
<div class="fignone" id="dds_02_0010__fig14600442174220"><span class="figcap"><b>Figure 1 </b>Accessing DB instances from a public network</span><br><span><img id="dds_02_0010__image12600174216429" src="en-us_image_0284274974.png"></span></div>
<div class="fignone" id="dds_02_0010__fig3595181794311"><span class="figcap"><b>Figure 2 </b>Accessing DB instances from a private network</span><br><span><img id="dds_02_0010__image15595517174313" src="en-us_image_0284275043.png"></span></div>
</div>
</div>
<div>
<div class="familylinks">
<div class="parentlink"><strong>Parent topic:</strong> <a href="dds_02_replica_set.html">Getting Started with Replica Sets</a></div>
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<h1 class="topictitle1">Restrictions</h1>
<div id="body1522808547322"><p id="dds_02_0011__en-us_topic_0105284934_p48042784123325">To improve the stability and security of DB instances, there are some restrictions on the use of DDS. For details, see <a href="#dds_02_0011__en-us_topic_0105284934_table60364850123535">Table 1</a>.</p>
<div class="tablenoborder"><a name="dds_02_0011__en-us_topic_0105284934_table60364850123535"></a><a name="en-us_topic_0105284934_table60364850123535"></a><table cellpadding="4" cellspacing="0" summary="" id="dds_02_0011__en-us_topic_0105284934_table60364850123535" frame="border" border="1" rules="all"><caption><b>Table 1 </b>Function restrictions</caption><thead align="left"><tr id="dds_02_0011__en-us_topic_0105284934_row63835418123535"><th align="left" class="cellrowborder" valign="top" width="27.26%" id="mcps1.3.2.2.3.1.1"><p id="dds_02_0011__en-us_topic_0105284934_p3286360123535"><strong id="dds_02_0011__en-us_topic_0105284934_b29577244123535">Operation</strong></p>
</th>
<th align="left" class="cellrowborder" valign="top" width="72.74000000000001%" id="mcps1.3.2.2.3.1.2"><p id="dds_02_0011__en-us_topic_0105284934_p46946588123535"><strong id="dds_02_0011__en-us_topic_0105284934_b842352706171539">Restrictions</strong></p>
</th>
</tr>
</thead>
<tbody><tr id="dds_02_0011__en-us_topic_0105284934_row65651390123535"><td class="cellrowborder" valign="top" width="27.26%" headers="mcps1.3.2.2.3.1.1 "><p id="dds_02_0011__en-us_topic_0105284934_p16162334123535">Connecting to a DB instance through a client</p>
</td>
<td class="cellrowborder" valign="top" width="72.74000000000001%" headers="mcps1.3.2.2.3.1.2 "><ul id="dds_02_0011__en-us_topic_0105284934_ul53814073144559"><li id="dds_02_0011__en-us_topic_0105284934_li109347144559">To access a <span class="keyword" id="dds_02_0011__keyword375831017484">DDS DB instance</span> which is not publicly accessible from an ECS, the instance must be in the same VPC subnet as the ECS.</li><li id="dds_02_0011__en-us_topic_0105284934_li46337654144559">By default, DDS cannot be accessed through an ECS in a different security group. You need to add an inbound rule to the DDS security group.</li><li id="dds_02_0011__en-us_topic_0105284934_li29581666144559">The default DDS port number is 8635. You can change it if you want to access DDS through another port.</li></ul>
</td>
</tr>
<tr id="dds_02_0011__en-us_topic_0105284934_row53074217123535"><td class="cellrowborder" valign="top" width="27.26%" headers="mcps1.3.2.2.3.1.1 "><p id="dds_02_0011__en-us_topic_0105284934_p4044355123535">Deployment</p>
</td>
<td class="cellrowborder" valign="top" width="72.74000000000001%" headers="mcps1.3.2.2.3.1.2 "><p id="dds_02_0011__en-us_topic_0105284934_p41829298123535">ECSs in which DB instances are deployed are not visible to you. Your applications can access the database only through an IP address and port.</p>
</td>
</tr>
<tr id="dds_02_0011__en-us_topic_0105284934_row60017787123535"><td class="cellrowborder" valign="top" width="27.26%" headers="mcps1.3.2.2.3.1.1 "><p id="dds_02_0011__en-us_topic_0105284934_p29602599123535">Obtaining permissions of user <strong id="dds_02_0011__en-us_topic_0105284934_b84235270617431">rwuser</strong></p>
</td>
<td class="cellrowborder" valign="top" width="72.74000000000001%" headers="mcps1.3.2.2.3.1.2 "><p id="dds_02_0011__en-us_topic_0105284934_p19341371123535">Only the <strong id="dds_02_0011__en-us_topic_0105284934_b84235270694322">rwuser</strong> user permissions are provided on the instance creation page.</p>
<p id="dds_02_0011__p1716401218589">For details about the related commands, see <a href="dds_faq_0033.html">Which Commands are Supported or Restricted by DDS?</a></p>
</td>
</tr>
<tr id="dds_02_0011__en-us_topic_0105284934_row62985361123535"><td class="cellrowborder" valign="top" width="27.26%" headers="mcps1.3.2.2.3.1.1 "><p id="dds_02_0011__p1540641123535">Setting database parameters</p>
</td>
<td class="cellrowborder" valign="top" width="72.74000000000001%" headers="mcps1.3.2.2.3.1.2 "><p id="dds_02_0011__p3859309423"></p>
<p id="dds_02_0011__p159333074217"></p>
<p id="dds_02_0011__p109814306422">Most database parameters in the parameter groups you created can be modified. For details, see section <a href="en-us_topic_configuration.html">Editing a Parameter Group</a>.</p>
<p id="dds_02_0011__p51021730164220"></p>
</td>
</tr>
<tr id="dds_02_0011__en-us_topic_0105284934_row19812839123535"><td class="cellrowborder" valign="top" width="27.26%" headers="mcps1.3.2.2.3.1.1 "><p id="dds_02_0011__en-us_topic_0105284934_p61336152123535">Migrating data</p>
</td>
<td class="cellrowborder" valign="top" width="72.74000000000001%" headers="mcps1.3.2.2.3.1.2 "><p id="dds_02_0011__p52021072133834">You can use command line tools, including mongoexport and mongoimport, to migrate data. For details, see section <a href="dds_03_0052.html">Migrating Data</a>.</p>
</td>
</tr>
<tr id="dds_02_0011__en-us_topic_0105284934_row18357798134159"><td class="cellrowborder" valign="top" width="27.26%" headers="mcps1.3.2.2.3.1.1 "><p id="dds_02_0011__en-us_topic_0105284934_p255375813428">Storage engine</p>
</td>
<td class="cellrowborder" valign="top" width="72.74000000000001%" headers="mcps1.3.2.2.3.1.2 "><p id="dds_02_0011__en-us_topic_0105284934_p2528698134215">Currently, DDS supports the WiredTiger storage engine only.</p>
</td>
</tr>
<tr id="dds_02_0011__en-us_topic_0105284934_row43544108123535"><td class="cellrowborder" valign="top" width="27.26%" headers="mcps1.3.2.2.3.1.1 "><p id="dds_02_0011__en-us_topic_0105284934_p37411822123535">Restarting a DB instance or a node</p>
</td>
<td class="cellrowborder" valign="top" width="72.74000000000001%" headers="mcps1.3.2.2.3.1.2 "><p id="dds_02_0011__en-us_topic_0105284934_p41132837123535">A DDS DB instance must be restarted on the DDS console.</p>
</td>
</tr>
<tr id="dds_02_0011__en-us_topic_0105284934_row27804808123535"><td class="cellrowborder" valign="top" width="27.26%" headers="mcps1.3.2.2.3.1.1 "><p id="dds_02_0011__p37597003123535">Viewing DDS backup files</p>
</td>
<td class="cellrowborder" valign="top" width="72.74000000000001%" headers="mcps1.3.2.2.3.1.2 "><p id="dds_02_0011__p63693518173">You can download and view the backup files on the DDS console. For details, see section <a href="en-us_topic_backup_download.html">Downloading Backup Files</a>.</p>
</td>
</tr>
</tbody>
</table>
</div>
</div>
<div>
<div class="familylinks">
<div class="parentlink"><strong>Parent topic:</strong> <a href="dds_02_replica_set.html">Getting Started with Replica Sets</a></div>
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<h1 class="topictitle1">Setting a Security Group </h1>
<div id="body1522808547322"><div class="section" id="dds_02_0013__en-us_topic_0105284937_section3152058916230"><h4 class="sectiontitle"><strong id="dds_02_0013__b6455183611343">Scenarios</strong></h4><p id="dds_02_0013__en-us_topic_0105284937_p43222116204125">This section guides you on how to add a security group rule to control access from and to <span class="keyword" id="dds_02_0013__keyword67053543120">DDS DB instances</span> in a security group. This document describes how to set security groups.</p>
</div>
<div class="section" id="dds_02_0013__en-us_topic_0105284937_section1282916720425"><h4 class="sectiontitle">Background Information</h4><p id="dds_02_0013__en-us_topic_0105284937_p27630095204125">You can access a DDS DB instance in either of the following ways:</p>
<ul id="dds_02_0013__en-us_topic_0105284937_ul47344269204125"><li id="dds_02_0013__en-us_topic_0105284937_li23445242204125">Public network</li><li id="dds_02_0013__en-us_topic_0105284937_li10720689204125">Internal network</li></ul>
</div>
<div class="section" id="dds_02_0013__en-us_topic_0105284937_section14550984204232"><h4 class="sectiontitle">Precautions</h4><p id="dds_02_0013__en-us_topic_0105284937_p5854544204125">The default security group rule allows all outgoing data packets. ECSs and DDS DB instances can access each other in the same security group. After a security group is created, you can add security group rules to control the access from and to the DDS DB instances in the security group.</p>
<p id="dds_02_0013__en-us_topic_0105284937_p1012315204125">By default, a tenant can create a maximum of 500 security group rules. An excessive number of security group rules increases the network latency of the first packet. It is recommended that you add a maximum of 50 rules for each security group.</p>
<p id="dds_02_0013__en-us_topic_0105284937_p41200900204125">To access the DDS DB instances in a security group from external resources, create an inbound rule for the security group.</p>
</div>
<div class="section" id="dds_02_0013__en-us_topic_0105284937_section25078651204428"><h4 class="sectiontitle"><strong id="dds_02_0013__b15424473204153">Procedure</strong></h4><ol id="dds_02_0013__en-us_topic_0105284937_ol49383781586"><li id="dds_02_0013__en-us_topic_0105284937_li93899141586"><span>Log in to the management console.</span></li><li id="dds_02_0013__en-us_topic_0105284937_li1870917810588"><span>Click <span><img id="dds_02_0013__en-us_topic_0105284937_image070916845819" src="en-us_image_0284275018.png"></span> in the upper left corner and select a region and project.</span></li><li id="dds_02_0013__en-us_topic_0105284937_li297543615857"><span>Click <strong id="dds_02_0013__b1252154513410">Service List</strong>. Under <strong id="dds_02_0013__b125334514414">Network</strong>, click <strong id="dds_02_0013__b125554554120">Virtual Private Cloud</strong>.</span></li><li id="dds_02_0013__en-us_topic_0105284937_li3171015115916"><span>In the navigation pane on the left, choose <strong id="dds_02_0013__b1947515014118">Access Control</strong> &gt; <strong id="dds_02_0013__b204771850144115">Security Groups</strong>.</span></li><li id="dds_02_0013__en-us_topic_0105284937_li140569415930"><span>On the <strong id="dds_02_0013__b14671315174216">Security Group</strong> page, click the security group name.</span></li><li id="dds_02_0013__en-us_topic_0105284937_li5489049115946"><span>On the <strong id="dds_02_0013__b19546171814217">Inbound Rules</strong> tab, click <strong id="dds_02_0013__b1354831820421">Add Rule</strong>. In the displayed <strong id="dds_02_0013__b13549111811426">Add Inbound Rule</strong> dialog box, set required parameters to add inbound rules. On the <strong id="dds_02_0013__b17816182834210">Outbound Rules</strong> tab, click <strong id="dds_02_0013__b4819152854214">Add Rule</strong>. In the displayed <strong id="dds_02_0013__b082652894213">Add Outbound Rule</strong> dialog box, set required parameters to add outbound rules.</span></li><li id="dds_02_0013__en-us_topic_0105284937_li6900819151212"><span>Add a security group rule as prompted.</span><p>
<div class="tablenoborder"><table cellpadding="4" cellspacing="0" summary="" id="dds_02_0013__en-us_topic_0105284937_en-us_topic_0118534005_table532116198213" width="90%" frame="border" border="1" rules="all"><caption><b>Table 1 </b>Parameter description</caption><thead align="left"><tr id="dds_02_0013__en-us_topic_0105284937_en-us_topic_0118534005_row731911191722"><th align="left" class="cellrowborder" valign="top" width="13.04%" id="mcps1.3.4.2.7.2.1.2.4.1.1"><p id="dds_02_0013__en-us_topic_0105284937_en-us_topic_0118534005_p17319119020"><strong id="dds_02_0013__b158649370431">Parameter</strong></p>
</th>
<th align="left" class="cellrowborder" valign="top" width="68.96%" id="mcps1.3.4.2.7.2.1.2.4.1.2"><p id="dds_02_0013__en-us_topic_0105284937_en-us_topic_0118534005_p431911191622"><strong id="dds_02_0013__b1047363994313">Description</strong></p>
</th>
<th align="left" class="cellrowborder" valign="top" width="18%" id="mcps1.3.4.2.7.2.1.2.4.1.3"><p id="dds_02_0013__en-us_topic_0105284937_en-us_topic_0118534005_p103191119621"><strong id="dds_02_0013__b17051140144319">Value Example</strong></p>
</th>
</tr>
</thead>
<tbody><tr id="dds_02_0013__en-us_topic_0105284937_en-us_topic_0118534005_row8320419723"><td class="cellrowborder" valign="top" width="13.04%" headers="mcps1.3.4.2.7.2.1.2.4.1.1 "><p id="dds_02_0013__en-us_topic_0105284937_en-us_topic_0118534005_p1432013199214">Protocol</p>
</td>
<td class="cellrowborder" valign="top" width="68.96%" headers="mcps1.3.4.2.7.2.1.2.4.1.2 "><p id="dds_02_0013__en-us_topic_0118534005_p432017191726">Specifies the network protocol. Allows all traffic or supports user-defined protocols, TCP, UDP, ICMP, and SSH.</p>
</td>
<td class="cellrowborder" valign="top" width="18%" headers="mcps1.3.4.2.7.2.1.2.4.1.3 "><p id="dds_02_0013__en-us_topic_0105284937_en-us_topic_0118534005_p1332014191216">TCP</p>
</td>
</tr>
<tr id="dds_02_0013__en-us_topic_0105284937_row15380125810476"><td class="cellrowborder" valign="top" width="13.04%" headers="mcps1.3.4.2.7.2.1.2.4.1.1 "><p id="dds_02_0013__en-us_topic_0105284937_p1538118582479">Port</p>
</td>
<td class="cellrowborder" valign="top" width="68.96%" headers="mcps1.3.4.2.7.2.1.2.4.1.2 "><p id="dds_02_0013__en-us_topic_0105284937_p1391312104488">Specifies the port allowing the access to ECSs or external devices. </p>
</td>
<td class="cellrowborder" valign="top" width="18%" headers="mcps1.3.4.2.7.2.1.2.4.1.3 "><p id="dds_02_0013__en-us_topic_0105284937_p1438118583479">8635</p>
</td>
</tr>
<tr id="dds_02_0013__en-us_topic_0105284937_en-us_topic_0118534005_row1732101910217"><td class="cellrowborder" valign="top" width="13.04%" headers="mcps1.3.4.2.7.2.1.2.4.1.1 "><p id="dds_02_0013__en-us_topic_0105284937_en-us_topic_0118534005_p16320131918211">Source/Destination</p>
</td>
<td class="cellrowborder" valign="top" width="68.96%" headers="mcps1.3.4.2.7.2.1.2.4.1.2 "><p id="dds_02_0013__en-us_topic_0105284937_p1953711281854">Specifies the supported IP address and security group.</p>
<ul id="dds_02_0013__en-us_topic_0105284937_en-us_topic_0118534005_ul474117187016"><li id="dds_02_0013__en-us_topic_0105284937_li204213179474"><strong id="dds_02_0013__b6421166468">IP address</strong>: indicates that the security group rule takes effect in a specified IP address range.<ul id="dds_02_0013__en-us_topic_0105284937_ul67881445105111"><li id="dds_02_0013__en-us_topic_0105284937_en-us_topic_0118534005_li87410184011">xxx.xxx.xxx.xxx/32 (IPv4)</li><li id="dds_02_0013__en-us_topic_0105284937_en-us_topic_0118534005_li1374113189012">xxx.xxx.xxx.0/24 (subnet)</li><li id="dds_02_0013__en-us_topic_0105284937_en-us_topic_0118534005_li167411218306">0.0.0.0/0 (any IP address)</li></ul>
</li><li id="dds_02_0013__en-us_topic_0105284937_li1390210401514"><strong id="dds_02_0013__b122046167469">Security group</strong>: indicates that this rule allows all IP addresses of ECSs to access DDS DB instances in the same specified security group.</li></ul>
</td>
<td class="cellrowborder" valign="top" width="18%" headers="mcps1.3.4.2.7.2.1.2.4.1.3 "><ul id="dds_02_0013__en-us_topic_0105284937_ul209321608538"><li id="dds_02_0013__en-us_topic_0105284937_li119329015535">192.168.10.0/24</li><li id="dds_02_0013__en-us_topic_0105284937_li209327055311">default</li></ul>
</td>
</tr>
</tbody>
</table>
</div>
</p></li><li id="dds_02_0013__en-us_topic_0105284937_li21369327151121"><span>Click <strong id="dds_02_0013__b842352706113845">OK</strong>.</span></li></ol>
</div>
</div>
<div>
<div class="familylinks">
<div class="parentlink"><strong>Parent topic:</strong> <a href="dds_02_replica_set.html">Getting Started with Replica Sets</a></div>
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<h1 class="topictitle1">Connecting to a Replica Set Instance</h1>
<div id="body1522808547322"><p id="dds_02_0014__p8060118"></p>
</div>
<div>
<ul class="ullinks">
<li class="ulchildlink"><strong><a href="dds_02_0015.html">Binding and Unbinding an EIP</a></strong><br>
</li>
<li class="ulchildlink"><strong><a href="dds_02_0016.html">Enabling or Disabling SSL</a></strong><br>
</li>
<li class="ulchildlink"><strong><a href="en-us_topic_0105284966.html">Connecting to a DB Instance Through a Client</a></strong><br>
</li>
</ul>
<div class="familylinks">
<div class="parentlink"><strong>Parent topic:</strong> <a href="dds_02_replica_set.html">Getting Started with Replica Sets</a></div>
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<h1 class="topictitle1">Binding and Unbinding an EIP</h1>
<div id="body1522328390777"><div class="section" id="dds_02_0015__section055104935914"><a name="dds_02_0015__section055104935914"></a><a name="section055104935914"></a><h4 class="sectiontitle"><strong id="dds_02_0015__b013651851316">Scenarios</strong></h4><p id="dds_02_0015__p6551149135917">You can access DDS through a private IP address or an EIP. The application scenario of the connection address is as follows:</p>
<ul id="dds_02_0015__ul115584945912"><li id="dds_02_0015__li14552049185915">Use a private IP address when:<p id="dds_02_0015__p12551049155916"><a name="dds_02_0015__li14552049185915"></a><a name="li14552049185915"></a>DDS provides a private IP address by default.</p>
<p id="dds_02_0015__p75510491599">Your applications are deployed on an ECS in a region where your replica set instance is located.</p>
</li></ul>
<ul id="dds_02_0015__ul1855449105913"><li id="dds_02_0015__li135514925912">Use an EIP when:<ul id="dds_02_0015__ul125516499595"><li id="dds_02_0015__li255104965916">Your applications are deployed on an ECS in a region separated from the region where your replica set instance is located.</li><li id="dds_02_0015__li65544917591">Your applications are deployed on another cloud platform.</li></ul>
</li></ul>
</div>
<div class="section" id="dds_02_0015__section1130510262514"><h4 class="sectiontitle">Precautions</h4><ul id="dds_02_0015__ul15712132844"><li id="dds_02_0015__li13712152748">Before accessing a database, you need to apply for an EIP on the VPC console. Then, add an inbound rule to allow the IP addresses or IP address ranges of ECSs. For details, see section <a href="dds_02_0013.html">Setting a Security Group</a>.</li><li id="dds_02_0015__li137122023418">In the replica set instance, only primary and secondary nodes can be bound to an EIP. To change the EIP that has been bound to a node, you need to unbind it from the node first.</li></ul>
</div>
<div class="section" id="dds_02_0015__section0350133891310"><a name="dds_02_0015__section0350133891310"></a><a name="section0350133891310"></a><h4 class="sectiontitle">Binding an EIP</h4><ol id="dds_02_0015__ol38264571203259"><li id="dds_02_0015__li8836821203259"><span>On the <strong id="dds_02_0015__b84235270615219">Instance Management</strong> page, click the target replica set instance.</span></li><li id="dds_02_0015__li349825362319"><span>In the navigation pane on the left, choose <span class="uicontrol" id="dds_02_0015__uicontrol87094403516"><b>Connections</b></span>. </span></li><li id="dds_02_0015__li44693916203259"><span>In the <span class="parmname" id="dds_02_0015__parmname769647905151058"><b>Basic Information</b></span> area, locate the target node and click <strong id="dds_02_0015__b842352706151152">Bind EIP</strong> in the <strong id="dds_02_0015__b84235270615126">Operation</strong> column.</span></li><li id="dds_02_0015__li63437472203259"><span>In the displayed dialog box, all EIPs in the unbound status are listed. Select the required EIP and click <strong id="dds_02_0015__b842352706204348">OK</strong>. If no available EIPs are displayed, click <span class="uicontrol" id="dds_02_0015__uicontrol7910157203259"><b>View EIP</b></span> and create an EIP on the VPC console.</span></li><li id="dds_02_0015__li4082557203259"><span>In the <strong id="dds_02_0015__b842352706105036">EIP</strong> column, check that the EIP is successfully bound.</span><p><p id="dds_02_0015__p23394266203259">To unbind an EIP from the DB instance, see <a href="#dds_02_0015__section142610351410">Unbinding an EIP</a>.</p>
</p></li></ol>
</div>
<div class="section" id="dds_02_0015__section142610351410"><a name="dds_02_0015__section142610351410"></a><a name="section142610351410"></a><h4 class="sectiontitle">Unbinding an EIP</h4><ol id="dds_02_0015__ol31276680102616"><li id="dds_02_0015__li35235350102616"><span>On the <strong id="dds_02_0015__b316210509">Instance Management</strong> page, click the replica set instance that has been bound with an EIP.</span></li><li id="dds_02_0015__li13636174313355"><span>In the navigation pane on the left, choose <span class="uicontrol" id="dds_02_0015__uicontrol8998202073619"><b>Connections</b></span>. </span></li><li id="dds_02_0015__li5185173121149"><span>In the <span class="parmname" id="dds_02_0015__parmname179551228193610"><b>Basic Information</b></span> area, locate the target node and click <strong id="dds_02_0015__b159552028193614">Unbind EIP</strong> in the <strong id="dds_02_0015__b995742811367">Operation</strong> column.</span></li><li id="dds_02_0015__li56439840102720"><span>In the displayed dialog box, click <strong id="dds_02_0015__b84235270695933">OK</strong> to unbind the EIP.</span><p><p id="dds_02_0015__p21771104103056">To bind an EIP to the DB instance again, see <a href="#dds_02_0015__section0350133891310">Binding an EIP</a>.</p>
</p></li></ol>
</div>
</div>
<div>
<div class="familylinks">
<div class="parentlink"><strong>Parent topic:</strong> <a href="dds_02_0014.html">Connecting to a Replica Set Instance</a></div>
</div>
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<h1 class="topictitle1">Enabling or Disabling SSL</h1>
<div id="body1522808554449"><div class="section" id="dds_02_0016__en-us_topic_0085468614_section4282820218710"><h4 class="sectiontitle">Scenarios</h4><p id="dds_02_0016__p83351424144118"><span id="dds_02_0016__text1901192015172">DDS</span> allows you to use SSL to encrypt connections to a DB instance to protect your data.</p>
<ul id="dds_02_0016__ul1504640174118"><li id="dds_02_0016__li750420408412">If SSL is enabled, you can connect to a database using SSL. For details, see <a href="en-us_topic_0105284966.html#en-us_topic_0105284966__section3730754113815">SSL Connection</a>.</li><li id="dds_02_0016__li550434034110">If SSL is disabled, you can connect to the database using a common connection. For details, see <a href="en-us_topic_0105284966.html#en-us_topic_0105284966__en-us_topic_0085335422_sfc3bfb212a8440799f49320d91fc096c">Common Connection</a>.</li></ul>
<div class="notice" id="dds_02_0016__en-us_topic_0085468614_note31049471182749"><span class="noticetitle"><img src="public_sys-resources/notice_3.0-en-us.png"> </span><div class="noticebody"><p id="dds_02_0016__en-us_topic_0085468614_p11009784182749">Enabling or disabling SSL will cause DB instance restart. Exercise caution when you perform this operation.</p>
</div></div>
</div>
<div class="section" id="dds_02_0016__section89891361751"><h4 class="sectiontitle">Enabling SSL</h4><ol id="dds_02_0016__en-us_topic_0105284965_en-us_topic_0085468614_en-us_topic_0049044698_ol36506495172844"><li id="dds_02_0016__en-us_topic_0105284965_en-us_topic_0085468614_en-us_topic_0049044698_li61161897172844"><span>On the <strong id="dds_02_0016__en-us_topic_0105284965_b10716113541816">Instance Management</strong> page, click the target replica set instance.</span></li><li id="dds_02_0016__en-us_topic_0105284965_li15539153193217"><span>In the navigation pane on the left, choose <span class="uicontrol" id="dds_02_0016__en-us_topic_0105284965_uicontrol12222202919295"><b>Connections</b></span>.</span></li><li id="dds_02_0016__en-us_topic_0105284965_en-us_topic_0085468614_en-us_topic_0049044698_li36398892172958"><span>In the <strong id="dds_02_0016__en-us_topic_0105284965_b81163442912">Basic Information</strong> area, click <span><img id="dds_02_0016__en-us_topic_0105284965_en-us_topic_0085468614_image11080545135556" src="en-us_image_0284275089.png"></span> next to the <strong id="dds_02_0016__en-us_topic_0105284965_b121213412912">SSL</strong> field.</span></li><li id="dds_02_0016__en-us_topic_0105284965_en-us_topic_0085468614_li6565827163611"><span>In the displayed dialog box, click <strong id="dds_02_0016__en-us_topic_0105284965_b6861938192318">Yes</strong>.</span></li><li id="dds_02_0016__en-us_topic_0105284965_en-us_topic_0085468614_li8198418174048"><span>In the <span class="uicontrol" id="dds_02_0016__en-us_topic_0105284965_uicontrol19981115320294"><b>Basic Information</b></span> area, view the modification result.</span></li></ol>
</div>
<div class="section" id="dds_02_0016__section584914451250"><a name="dds_02_0016__section584914451250"></a><a name="section584914451250"></a><h4 class="sectiontitle">Disabling SSL</h4><ol id="dds_02_0016__en-us_topic_0105284965_en-us_topic_0085468614_ol17873318277"><li id="dds_02_0016__en-us_topic_0105284965_en-us_topic_0085468614_li160859818277"><span>On the <strong id="dds_02_0016__en-us_topic_0105284965_b17199125917237">Instance Management</strong> page, click the target replica set instance.</span></li><li id="dds_02_0016__en-us_topic_0105284965_li1234241518492"><span>In the navigation pane on the left, choose <span class="uicontrol" id="dds_02_0016__en-us_topic_0105284965_uicontrol10955057202919"><b>Connections</b></span>.</span></li><li id="dds_02_0016__en-us_topic_0105284965_en-us_topic_0085468614_li7429532163530"><span>In the <strong id="dds_02_0016__en-us_topic_0105284965_b393520153307">Basic Information</strong> area, click <span><img id="dds_02_0016__en-us_topic_0105284965_en-us_topic_0085468614_image5863355116364" src="en-us_image_0284275146.png"></span> next to the <strong id="dds_02_0016__en-us_topic_0105284965_b14936101515301">SSL</strong> field.</span></li><li id="dds_02_0016__en-us_topic_0105284965_en-us_topic_0085468614_li758519119381"><span>In the displayed dialog box, click <strong id="dds_02_0016__en-us_topic_0105284965_b5732104182519">Yes</strong>.</span></li><li id="dds_02_0016__en-us_topic_0105284965_en-us_topic_0085468614_li34492814174353"><span>In the <span class="uicontrol" id="dds_02_0016__en-us_topic_0105284965_uicontrol59301615256"><b>Basic Information</b></span> area, view the modification result.</span></li></ol>
</div>
</div>
<div>
<div class="familylinks">
<div class="parentlink"><strong>Parent topic:</strong> <a href="dds_02_0014.html">Connecting to a Replica Set Instance</a></div>
</div>
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<h1 class="topictitle1">Logging In to the DDS Console</h1>
<div id="body1552545230537"><div class="section" id="dds_02_0043__section5966101210598"><h4 class="sectiontitle"><strong id="dds_02_0043__b14445498153">Prerequisites</strong></h4><p id="dds_02_0043__p12552131419454">You have registered an account.</p>
<p id="dds_02_0043__p33562152596">For the first time you use DDS, register an account at the official website. After the registration, your account has permissions to access the DDS service, as well as all other cloud services.</p>
</div>
<div class="section" id="dds_02_0043__section162273713415"><h4 class="sectiontitle">Procedure</h4><ol id="dds_02_0043__ol1679419416719"><li id="dds_02_0043__li2057364417214"><span>Log in to the management console.</span></li><li id="dds_02_0043__li07647256118"><span>Click <span><img id="dds_02_0043__image874819251118" src="en-us_image_0284275118.png"></span> in the upper left corner and select a region and a project.</span></li><li id="dds_02_0043__li5100854214"><span>Click <strong id="dds_02_0043__b7660948648">Service List</strong>. Under <strong id="dds_02_0043__b146601481545">Database</strong>, click <strong id="dds_02_0043__b146601648745">Document Database Service</strong> to go to the DDS console.</span></li></ol>
</div>
</div>

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<a name="dds_02_cluster"></a><a name="dds_02_cluster"></a>
<h1 class="topictitle1">Getting Started with Clusters</h1>
<div id="body41071365"></div>
<div>
<ul class="ullinks">
<li class="ulchildlink"><strong><a href="dds_02_0003.html">Service Process</a></strong><br>
</li>
<li class="ulchildlink"><strong><a href="dds_02_0002.html">Restrictions</a></strong><br>
</li>
<li class="ulchildlink"><strong><a href="dds_02_0008.html">Creating a Cluster Instance</a></strong><br>
</li>
<li class="ulchildlink"><strong><a href="dds_02_0005.html">Setting a Security Group</a></strong><br>
</li>
<li class="ulchildlink"><strong><a href="dds_02_0009.html">Connecting to a Cluster Instance</a></strong><br>
</li>
</ul>
</div>

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<h1 class="topictitle1">Getting Started with Replica Sets</h1>
<div id="body1522808549050"></div>
<div>
<ul class="ullinks">
<li class="ulchildlink"><strong><a href="dds_02_0010.html">Service Process</a></strong><br>
</li>
<li class="ulchildlink"><strong><a href="dds_02_0011.html">Restrictions</a></strong><br>
</li>
<li class="ulchildlink"><strong><a href="dds_02_0012.html">Creating a Replica Set Instance</a></strong><br>
</li>
<li class="ulchildlink"><strong><a href="dds_02_0013.html">Setting a Security Group</a></strong><br>
</li>
<li class="ulchildlink"><strong><a href="dds_02_0014.html">Connecting to a Replica Set Instance</a></strong><br>
</li>
</ul>
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<h1 class="topictitle1">Managing DDS DB Instances</h1>
<div id="body59286834"></div>
<div>
<ul class="ullinks">
<li class="ulchildlink"><strong><a href="dds_03_0002.html">DB Instance Operations</a></strong><br>
</li>
<li class="ulchildlink"><strong><a href="dds_03_0057.html">Managing Database Accounts</a></strong><br>
</li>
<li class="ulchildlink"><strong><a href="dds_03_0052.html">Migrating Data</a></strong><br>
</li>
<li class="ulchildlink"><strong><a href="dds_03_0006.html">Backup and Restore</a></strong><br>
</li>
<li class="ulchildlink"><strong><a href="dds_03_0010.html">Parameter Group</a></strong><br>
</li>
<li class="ulchildlink"><strong><a href="dds_03_0017.html">Storage</a></strong><br>
</li>
<li class="ulchildlink"><strong><a href="dds_08_0001.html">Changing DB Instance Classes</a></strong><br>
</li>
<li class="ulchildlink"><strong><a href="dds_03_0019.html">Security</a></strong><br>
</li>
<li class="ulchildlink"><strong><a href="dds_03_0023.html">Tag</a></strong><br>
</li>
<li class="ulchildlink"><strong><a href="dds_03_0040.html">Task Center</a></strong><br>
</li>
</ul>
</div>

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<a name="dds_03_0002"></a><a name="dds_03_0002"></a>
<h1 class="topictitle1">DB Instance Operations</h1>
<div id="body1522815494794"><p id="dds_03_0002__p8060118"></p>
</div>
<div>
<ul class="ullinks">
<li class="ulchildlink"><strong><a href="dds_03_0075.html">Modifying the DB Instance Name</a></strong><br>
</li>
<li class="ulchildlink"><strong><a href="dds_03_0051.html">Exporting DB Instance Information</a></strong><br>
</li>
<li class="ulchildlink"><strong><a href="dds_03_0050.html">Manually Switching the Primary and Secondary Nodes of a Replica Set</a></strong><br>
</li>
<li class="ulchildlink"><strong><a href="dds_03_0003.html">Restarting a DB Instance or a Node</a></strong><br>
</li>
<li class="ulchildlink"><strong><a href="dds_03_0004.html">Deleting a DB instance</a></strong><br>
</li>
</ul>
<div class="familylinks">
<div class="parentlink"><strong>Parent topic:</strong> <a href="dds_03_0001.html">Managing DDS DB Instances</a></div>
</div>
</div>

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<h1 class="topictitle1">Restarting a DB Instance or a Node</h1>
<div id="body56353115"><div class="section" id="dds_03_0003__section1538841202523"><h4 class="sectiontitle"><strong id="dds_03_0003__b84235270694112">Scenarios</strong></h4><p id="dds_03_0003__p5594740171230">You may need to restart a DB instance for maintenance purposes. After modifying some parameters, you must restart the DB instance for the modifications to take effect on the management console.</p>
<p id="dds_03_0003__p19284957162918">You can restart a DB instance only when its status is <span class="uicontrol" id="dds_03_0003__uicontrol529315153611"><b>Available</b></span>.</p>
<div class="notice" id="dds_03_0003__note49672722171414"><span class="noticetitle"><img src="public_sys-resources/notice_3.0-en-us.png"> </span><div class="noticebody"><ul id="dds_03_0003__ul4274668016459"><li id="dds_03_0003__li5998712916459">After you restart a DB instance, services will be interrupted. Exercise caution when performing this operation.</li><li id="dds_03_0003__li301325016459">If you restart a DB instance, all nodes in the instance will be restarted.</li></ul>
</div></div>
</div>
<div class="section" id="dds_03_0003__section986617183648"><h4 class="sectiontitle">Restarting a DB Instance</h4><ol id="dds_03_0003__o5cd45f465a3b474dbdc23954ed769939"><li id="dds_03_0003__li312682313217"><span><a href="dds_02_0043.html">Log in to the DDS console.</a></span></li><li id="dds_03_0003__l3f1dae48c6be4c238d5a22b49431a5a6"><span>On the <span class="parmname" id="dds_03_0003__parmname100838777520309"><b>Instance Management</b></span> page, locate the target DB instance and choose <span class="menucascade" id="dds_03_0003__menucascade785070312203030"><b><span class="uicontrol" id="dds_03_0003__uicontrol765537839203030">More</span></b> &gt; <b><span class="uicontrol" id="dds_03_0003__uicontrol1313383689203030">Restart</span></b></span> in the <strong id="dds_03_0003__b8423527069439">Operation</strong> column.</span><p><p id="dds_03_0003__p9615143515481">Alternatively, click the target DB instance. On the displayed <strong id="dds_03_0003__b205649414395">Basic Information</strong> page, click <strong id="dds_03_0003__b61779313373">Restart</strong> in the upper right corner of the page.</p>
</p></li><li id="dds_03_0003__l57619a6f46fb4d3da03a966e6e197e54"><span>In the displayed dialog box, click <span class="parmname" id="dds_03_0003__parmname76964790591510"><b>Yes</b></span>.</span></li><li id="dds_03_0003__li5877485919459"><span>View the restart status.</span><p><ol type="a" id="dds_03_0003__ol21264366192427"><li id="dds_03_0003__li35806698192429">On the <strong id="dds_03_0003__b903604656102525">Instance Management</strong> page, the instance status is <strong id="dds_03_0003__b842352706103045">Restarting</strong>.</li><li id="dds_03_0003__li57748098192427">On the <span class="uicontrol" id="dds_03_0003__uicontrol181327725791942"><b>Basic Information</b></span> page, all nodes of the cluster instance cannot be restarted.</li></ol>
</p></li></ol>
</div>
<div class="section" id="dds_03_0003__section42490975183655"><h4 class="sectiontitle">Restarting a Node (Cluster)</h4><ol id="dds_03_0003__o61aba0ec8639408d93edfa0f2e7bc30a"><li id="dds_03_0003__li510217230279"><span><a href="dds_02_0043.html">Log in to the DDS console.</a></span></li><li id="dds_03_0003__l8ace08773a9442af864967ce7beab047"><span>On the <strong id="dds_03_0003__b1708346183920">Instance Management</strong> page, click the target cluster instance.</span></li><li id="dds_03_0003__l6a3f6334c2484524beb87828d465befa"><span>In the <span class="uicontrol" id="dds_03_0003__uicontrol127921324174213"><b>Node Information</b></span> area on the <span class="uicontrol" id="dds_03_0003__uicontrol1710532134210"><b>Basic Information</b></span> page, click <span class="uicontrol" id="dds_03_0003__uicontrol1696172384117"><b>mongos</b></span>, <span class="uicontrol" id="dds_03_0003__uicontrol5697102313416"><b>shard</b></span>, or <span class="uicontrol" id="dds_03_0003__uicontrol13697192320411"><b>config</b></span>, locate the target node, and click <span class="uicontrol" id="dds_03_0003__uicontrol56977233416"><b>Restart</b></span>.</span></li><li id="dds_03_0003__li1775217447164"><span>In the displayed dialog box, click <strong id="dds_03_0003__b1163685714436">Yes</strong>.</span></li><li id="dds_03_0003__li34731609193128"><span>View the node status.</span><p><p id="dds_03_0003__p12965523112838">When one node status is <span class="uicontrol" id="dds_03_0003__uicontrol233484214448"><b>Restarting</b></span>, other nodes of the instance cannot be restarted.</p>
</p></li></ol>
</div>
</div>
<div>
<div class="familylinks">
<div class="parentlink"><strong>Parent topic:</strong> <a href="dds_03_0002.html">DB Instance Operations</a></div>
</div>
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<h1 class="topictitle1">Deleting a DB instance</h1>
<div id="body24265995"><div class="section" id="dds_03_0004__section51218066203238"><h4 class="sectiontitle"><strong id="dds_03_0004__b84235270694112">Scenarios</strong></h4><p id="dds_03_0004__p35617126203242">This section guides you on how to delete a DB instance no longer used to release resources. You can delete the following types of DB instances:</p>
<ul id="dds_03_0004__ul3795174417252"><li id="dds_03_0004__li879519449255">Cluster instance</li><li id="dds_03_0004__li579504422511">Replica set instance</li></ul>
</div>
<div class="notice" id="dds_03_0004__n5b2e143478164f97b0fcaa405e3e0889"><span class="noticetitle"><img src="public_sys-resources/notice_3.0-en-us.png"> </span><div class="noticebody"><ul id="dds_03_0004__ul59912606194213"><li id="dds_03_0004__li88270310244">After you delete an instance, all nodes in the instance are also deleted.</li><li id="dds_03_0004__li41417833194215">After you delete the DB instance, all data in it and all automated backups are automatically deleted and cannot be restored. Exercise caution when performing this operation.</li><li id="dds_03_0004__li111622059182917">By default, all manual backups are retained in DDS. You can use a backup to restore a deleted instance.</li></ul>
</div></div>
<div class="section" id="dds_03_0004__s73bfa9753f8846dca66db91183a48e1c"><h4 class="sectiontitle"><strong id="dds_03_0004__b842352706192255">Procedure</strong></h4><ol id="dds_03_0004__o2ef756f801804ea0939f110501cc8e03"><li id="dds_03_0004__li312682313217"><span><a href="dds_02_0043.html">Log in to the DDS console.</a></span></li><li id="dds_03_0004__lc9ae3592be974fe1adaaefb22eeee523"><span>On the <span class="parmname" id="dds_03_0004__parmname1389916107469"><b>Instance Management</b></span> page, locate the target DB instance and choose <span class="menucascade" id="dds_03_0004__menucascade990471016468"><b><span class="uicontrol" id="dds_03_0004__uicontrol79007105469">More</span></b> &gt; <b><span class="uicontrol" id="dds_03_0004__uicontrol14902111010461">Delete</span></b></span> in the <strong id="dds_03_0004__b19905181011463">Operation</strong> column.</span></li><li id="dds_03_0004__li1905939195633"><span>In the displayed dialog box, click <span class="parmname" id="dds_03_0004__parmname17955163010196"><b>Yes</b></span>.</span></li></ol>
</div>
</div>
<div>
<div class="familylinks">
<div class="parentlink"><strong>Parent topic:</strong> <a href="dds_03_0002.html">DB Instance Operations</a></div>
</div>
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<h1 class="topictitle1">Backup and Restore</h1>
<div id="body37593218"></div>
<div>
<ul class="ullinks">
<li class="ulchildlink"><strong><a href="en-us_topic_backup_restore.html">Setting Automated Backup Policy</a></strong><br>
</li>
<li class="ulchildlink"><strong><a href="dds_03_0007.html">Creating a Manual Backup</a></strong><br>
</li>
<li class="ulchildlink"><strong><a href="dds_03_0042.html">Restoring a Cluster Instance from a Backup</a></strong><br>
</li>
<li class="ulchildlink"><strong><a href="dds_03_0043.html">Restoring a Replica Set Instance from a Backup</a></strong><br>
</li>
<li class="ulchildlink"><strong><a href="en-us_topic_backup_download.html">Downloading Backup Files</a></strong><br>
</li>
<li class="ulchildlink"><strong><a href="dds_03_0008.html">Deleting a Manual Backup</a></strong><br>
</li>
<li class="ulchildlink"><strong><a href="dds_03_0009.html">Deleting an Automated Backup</a></strong><br>
</li>
</ul>
<div class="familylinks">
<div class="parentlink"><strong>Parent topic:</strong> <a href="dds_03_0001.html">Managing DDS DB Instances</a></div>
</div>
</div>

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<a name="dds_03_0007"></a><a name="dds_03_0007"></a>
<h1 class="topictitle1">Creating a Manual Backup</h1>
<div id="body40795435"><div class="section" id="dds_03_0007__section618580621992"><h4 class="sectiontitle"><strong id="dds_03_0007__b84235270694112">Scenarios</strong></h4><p id="dds_03_0007__p165090241996">This section guides you on how to create a manual backup. Creating a backup for a DB instance helps ensure data can be restored if needed, ensuring data reliability.</p>
<div class="note" id="dds_03_0007__note4735945219920"><img src="public_sys-resources/note_3.0-en-us.png"><span class="notetitle"> </span><div class="notebody"><p id="dds_03_0007__p9746272175259">When you delete a DB instance, its automated backups are also deleted but its manual backups are retained.</p>
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<div class="section" id="dds_03_0007__section5642991212401"><h4 class="sectiontitle">Method 1</h4><ol id="dds_03_0007__ol40494838123950"><li id="dds_03_0007__li312682313217"><span><a href="dds_02_0043.html">Log in to the DDS console.</a></span></li><li id="dds_03_0007__li28909226123950"><span>On the <span class="uicontrol" id="dds_03_0007__uicontrol1875910135511"><b>Instance Management</b></span> page, locate an available DB instance and click <span class="uicontrol" id="dds_03_0007__uicontrol194544151766"><b>Create Backup</b></span> or choose <span class="uicontrol" id="dds_03_0007__uicontrol1865812267617"><b>More</b></span> &gt; <span class="uicontrol" id="dds_03_0007__uicontrol128611732469"><b>Create Backup</b></span>.</span></li><li id="dds_03_0007__li59945994123950"><span>In the displayed dialog box, specify <strong id="dds_03_0007__b842352706161257">Backup Name</strong> and <strong id="dds_03_0007__b84235270617429">Description</strong> and click <strong id="dds_03_0007__b842352706151136">OK</strong>.</span><p><ul id="dds_03_0007__ul11503104512387"><li id="dds_03_0007__li17503104510382">The manual backup name can be 4 to 64 characters long. It must start with a letter and can contain only uppercase letters, lowercase letters, digits, hyphens (-), and underscores (_).</li><li id="dds_03_0007__li750344553812">The description contains a maximum of 256 characters and cannot contain the carriage return character and the following special characters: &gt;!&lt;"&amp;'=</li></ul>
</p></li><li id="dds_03_0007__li26900796123950"><span>Check the result:</span><p><ul id="dds_03_0007__ul454612415561"><li id="dds_03_0007__li11376104611403">During the creation of a manual backup, you can query the backup status on the <strong id="dds_03_0007__b7302543104413">Backup Management</strong> or the <strong id="dds_03_0007__b990025710446">Backups &amp; Restorations</strong> page. The backup status is <strong id="dds_03_0007__b1862152144516">Backing up</strong>. The time it takes to complete the backup depends on the size of the job.</li><li id="dds_03_0007__li16310733078">If the manual backup is successfully created, the backup status is <strong id="dds_03_0007__b175481652154618">Complete</strong>. The manual backup type is <strong id="dds_03_0007__b0700522134811">Manual</strong> and the backup method is <strong id="dds_03_0007__b07001222194820">Physical</strong>.</li></ul>
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<div class="section" id="dds_03_0007__section40461508182024"><h4 class="sectiontitle">Method 2</h4><ol id="dds_03_0007__ol56156717182024"><li id="dds_03_0007__li49721256281"><span><a href="dds_02_0043.html">Log in to the DDS console.</a></span></li><li id="dds_03_0007__li1322381705716"><span>In the navigation pane on the left, click <span class="uicontrol" id="dds_03_0007__uicontrol25531620191316"><b>Backup Management</b></span>.</span></li><li id="dds_03_0007__li19974315711"><span>On the <strong id="dds_03_0007__b842352706101851">Backup Management</strong> page, click <span class="uicontrol" id="dds_03_0007__uicontrol23094277710190"><b>Create Backup</b></span>.</span></li><li id="dds_03_0007__li1840326182024"><span>In the displayed dialog box, specify <strong id="dds_03_0007__b429012761515">DB Instance Type</strong>, <strong id="dds_03_0007__b490491267">DB Instance Name</strong>, <strong id="dds_03_0007__b3737546171418">Backup Name</strong> and <strong id="dds_03_0007__b1553391128">Description</strong> and click <strong id="dds_03_0007__b1647863203">OK</strong>.</span><p><ul id="dds_03_0007__ul1333211547116"><li id="dds_03_0007__en-us_topic_0085335413_li19454124192213">Only DB instances in <strong id="dds_03_0007__b84235270615511">Available</strong> status can be manually backed up.</li><li id="dds_03_0007__li89631118171614">The manual backup name can be 4 to 64 characters long. It must start with a letter and can contain only uppercase letters, lowercase letters, digits, hyphens (-), and underscores (_).</li><li id="dds_03_0007__li1396571816161">The description contains a maximum of 256 characters and cannot contain the carriage return character and the following special characters: &gt;!&lt;"&amp;'=</li></ul>
</p></li><li id="dds_03_0007__li47464844182024"><span>Check the result:</span><p><ul id="dds_03_0007__dds_03_0007_ul454612415561"><li id="dds_03_0007__dds_03_0007_li11376104611403">During the creation of a manual backup, you can query the backup status on the <strong id="dds_03_0007__dds_03_0007_b7302543104413">Backup Management</strong> or the <strong id="dds_03_0007__dds_03_0007_b990025710446">Backups &amp; Restorations</strong> page. The backup status is <strong id="dds_03_0007__dds_03_0007_b1862152144516">Backing up</strong>. The time it takes to complete the backup depends on the size of the job.</li><li id="dds_03_0007__dds_03_0007_li16310733078">If the manual backup is successfully created, the backup status is <strong id="dds_03_0007__dds_03_0007_b175481652154618">Complete</strong>. The manual backup type is <strong id="dds_03_0007__dds_03_0007_b0700522134811">Manual</strong> and the backup method is <strong id="dds_03_0007__dds_03_0007_b07001222194820">Physical</strong>.</li></ul>
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<div class="section" id="dds_03_0007__section5636963115314"><h4 class="sectiontitle">Method 3</h4><ol id="dds_03_0007__ol61173609153117"><li id="dds_03_0007__li1882191011289"><span><a href="dds_02_0043.html">Log in to the DDS console.</a></span></li><li id="dds_03_0007__li34566410153117"><span>On the <strong id="dds_03_0007__b0368152521616">Instance Management</strong> page, click an available DB instance.</span></li><li id="dds_03_0007__li109911781216"><span>In the navigation pane on the left, click <span class="uicontrol" id="dds_03_0007__uicontrol1144416113183"><b>Backups &amp; Restorations</b></span>.</span></li><li id="dds_03_0007__li971082610112"><span>On the <strong id="dds_03_0007__b1035573131811">Backups &amp; Restorations</strong> page, click <span class="uicontrol" id="dds_03_0007__uicontrol735653120185"><b>Create Backup</b></span>.</span></li><li id="dds_03_0007__li56577057154136"><span>In the displayed dialog box, specify <strong id="dds_03_0007__b18273111461915">Backup Name</strong> and <strong id="dds_03_0007__b16273914131913">Description</strong> and click <strong id="dds_03_0007__b42741114131914">OK</strong>.</span><p><ul id="dds_03_0007__ul1389901713128"><li id="dds_03_0007__en-us_topic_0085335413_li17503104510382">The manual backup name can be 4 to 64 characters long. It must start with a letter and can contain only uppercase letters, lowercase letters, digits, hyphens (-), and underscores (_).</li><li id="dds_03_0007__en-us_topic_0085335413_li750344553812">The description contains a maximum of 256 characters and cannot contain the carriage return character and the following special characters: &gt;!&lt;"&amp;'=</li></ul>
</p></li><li id="dds_03_0007__li7207612154357"><span>Check the result:</span><p><ul id="dds_03_0007__dds_03_0007_ul454612415561_1"><li id="dds_03_0007__dds_03_0007_li11376104611403_1">During the creation of a manual backup, you can query the backup status on the <strong id="dds_03_0007__dds_03_0007_b7302543104413_1">Backup Management</strong> or the <strong id="dds_03_0007__dds_03_0007_b990025710446_1">Backups &amp; Restorations</strong> page. The backup status is <strong id="dds_03_0007__dds_03_0007_b1862152144516_1">Backing up</strong>. The time it takes to complete the backup depends on the size of the job.</li><li id="dds_03_0007__dds_03_0007_li16310733078_1">If the manual backup is successfully created, the backup status is <strong id="dds_03_0007__dds_03_0007_b175481652154618_1">Complete</strong>. The manual backup type is <strong id="dds_03_0007__dds_03_0007_b0700522134811_1">Manual</strong> and the backup method is <strong id="dds_03_0007__dds_03_0007_b07001222194820_1">Physical</strong>.</li></ul>
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<div class="familylinks">
<div class="parentlink"><strong>Parent topic:</strong> <a href="dds_03_0006.html">Backup and Restore</a></div>
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<h1 class="topictitle1">Deleting a Manual Backup</h1>
<div id="body36196256"><div class="section" id="dds_03_0008__section28937012194642"><h4 class="sectiontitle"><strong id="dds_03_0008__b84235270694112">Scenarios</strong></h4><p id="dds_03_0008__p59358830194646">This section describes how to delete manual backups to release the storage space.</p>
<div class="notice" id="dds_03_0008__note34631073111154"><span class="noticetitle"><img src="public_sys-resources/notice_3.0-en-us.png"> </span><div class="noticebody"><p id="dds_03_0008__p43244209111154">The deletion operation is irreversible. Exercise caution when performing this operation.</p>
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<div class="section" id="dds_03_0008__s73bfa9753f8846dca66db91183a48e1c"><h4 class="sectiontitle">Method 1</h4><ol id="dds_03_0008__o2ef756f801804ea0939f110501cc8e03"><li id="dds_03_0008__li312682313217"><span><a href="dds_02_0043.html">Log in to the DDS console.</a></span></li><li id="dds_03_0008__li2915858216429"><span>On the <strong id="dds_03_0008__b18180453151613">Instance Management</strong> page, click the target DB instance.</span></li><li id="dds_03_0008__li729618561254"><span>In the navigation pane on the left, click <span class="uicontrol" id="dds_03_0008__uicontrol20107165618161"><b>Backups &amp; Restorations</b></span>.</span></li><li id="dds_03_0008__lc9ae3592be974fe1adaaefb22eeee523"><span>On the <strong id="dds_03_0008__b84235270695954">Backups &amp; Restorations</strong> page, locate the manual backup to be deleted and click <strong id="dds_03_0008__b84235270610031">Delete</strong>.</span><p><p id="dds_03_0008__p3241042816258">Backups being used to recover instances cannot be deleted.</p>
</p></li><li id="dds_03_0008__en-us_topic_0023328311_li54551811344"><span>In the displayed dialog box, click <strong id="dds_03_0008__b0611162872414">Yes</strong>.</span></li></ol>
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<div class="section" id="dds_03_0008__section62073393114623"><h4 class="sectiontitle">Method 2</h4><ol id="dds_03_0008__ol47948639114632"><li id="dds_03_0008__li48911426142917"><span><a href="dds_02_0043.html">Log in to the DDS console.</a></span></li><li id="dds_03_0008__li64371531969"><span>In the navigation pane on the left, click <span class="uicontrol" id="dds_03_0008__uicontrol8579132619172"><b>Backup Management</b></span>.</span></li><li id="dds_03_0008__li28884567114632"><span>On the <strong id="dds_03_0008__b7268162510239">Backup Management</strong> page, click the <strong id="dds_03_0008__b1826962512316">Clusters</strong> or <strong id="dds_03_0008__b14270142572310">Replica Sets</strong> tab, locate the manual backup you want to delete and click <strong id="dds_03_0008__b172717251231">Delete</strong> in the <strong id="dds_03_0008__b11271192552318">Operation</strong> column.</span><p><p id="dds_03_0008__p6377194116319">Backups being used to recover instances cannot be deleted.</p>
</p></li><li id="dds_03_0008__li57948597114632"><span>In the displayed dialog box, click <strong id="dds_03_0008__dds_03_0008_b0611162872414">Yes</strong>.</span></li></ol>
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<div class="familylinks">
<div class="parentlink"><strong>Parent topic:</strong> <a href="dds_03_0006.html">Backup and Restore</a></div>
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<h1 class="topictitle1">Deleting an Automated Backup</h1>
<div id="body1530068708055"><div class="section" id="dds_03_0009__section28937012194642"><h4 class="sectiontitle"><strong id="dds_03_0009__b84235270694112">Scenarios</strong></h4><p id="dds_03_0009__p7885171214114">This section guides you on how to delete an automated backup. If the automated backup policy is disabled, DDS allows you to delete stored automated backups to release storage space.</p>
<p id="dds_03_0009__p17461454161517">If the automated backup policy is enabled, DDS will delete automated backups as they expire. You cannot delete them manually.</p>
<div class="notice" id="dds_03_0009__note34631073111154"><span class="noticetitle"><img src="public_sys-resources/notice_3.0-en-us.png"> </span><div class="noticebody"><p id="dds_03_0009__p43244209111154">The deletion operation is irreversible. Exercise caution when performing this operation.</p>
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<div class="section" id="dds_03_0009__section19918439472"><h4 class="sectiontitle">Method 1</h4><ol id="dds_03_0009__o2ef756f801804ea0939f110501cc8e03"><li id="dds_03_0009__li312682313217"><span><a href="dds_02_0043.html">Log in to the DDS console.</a></span></li><li id="dds_03_0009__li2915858216429"><span>On the <strong id="dds_03_0009__b29845111713">Instance Management</strong> page, click the target DB instance.</span></li><li id="dds_03_0009__li174993116615"><span>In the navigation pane on the left, click <span class="uicontrol" id="dds_03_0009__uicontrol24913537175"><b>Backups &amp; Restorations</b></span>.</span></li><li id="dds_03_0009__lc9ae3592be974fe1adaaefb22eeee523"><span>On the <strong id="dds_03_0009__b84235270695954">Backups &amp; Restorations</strong> tab, locate the automated backup to be deleted and click <strong id="dds_03_0009__b84235270610031">Delete</strong>.</span><p><p id="dds_03_0009__p3241042816258">Backups being used to recover instances cannot be deleted.</p>
</p></li><li id="dds_03_0009__en-us_topic_0023328311_li54551811344"><span>In the displayed dialog box, click <strong id="dds_03_0009__b441733772412">Yes</strong>.</span></li></ol>
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<div class="section" id="dds_03_0009__section19194391177"><h4 class="sectiontitle">Method 2</h4><ol id="dds_03_0009__ol47948639114632"><li id="dds_03_0009__li4797123842913"><span><a href="dds_02_0043.html">Log in to the DDS console.</a></span></li><li id="dds_03_0009__li146073220426"><span>In the navigation pane on the left, click <span class="uicontrol" id="dds_03_0009__uicontrol899953481813"><b>Backup Management</b></span>.</span></li><li id="dds_03_0009__li28884567114632"><span>On the <strong id="dds_03_0009__b85901642202720">Backup Management</strong> page, click the <strong id="dds_03_0009__b1759144219271">Clusters</strong> or <strong id="dds_03_0009__b359117428276">Replica Sets</strong> tab, locate the automated backup you want to delete and click <strong id="dds_03_0009__b1659264262717">Delete</strong> in the <strong id="dds_03_0009__b9592194252711">Operation</strong> column.</span><p><p id="dds_03_0009__p6377194116319">Backups being used to recover instances cannot be deleted.</p>
</p></li><li id="dds_03_0009__li57948597114632"><span>In the displayed dialog box, click <strong id="dds_03_0009__dds_03_0008_b0611162872414">Yes</strong>.</span></li></ol>
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<div class="familylinks">
<div class="parentlink"><strong>Parent topic:</strong> <a href="dds_03_0006.html">Backup and Restore</a></div>
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<h1 class="topictitle1">Parameter Group</h1>
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<ul class="ullinks">
<li class="ulchildlink"><strong><a href="en-us_topic_parameter_group.html">Creating a Parameter Group</a></strong><br>
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<li class="ulchildlink"><strong><a href="en-us_topic_configuration.html">Editing a Parameter Group</a></strong><br>
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<li class="ulchildlink"><strong><a href="dds_03_0012.html">Comparing Two Parameter Groups</a></strong><br>
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<li class="ulchildlink"><strong><a href="dds_03_0013.html">Replicating a Parameter Group</a></strong><br>
</li>
<li class="ulchildlink"><strong><a href="dds_03_0014.html">Changing Associated Parameter Group</a></strong><br>
</li>
<li class="ulchildlink"><strong><a href="dds_03_0015.html">Resetting a Parameter Group</a></strong><br>
</li>
<li class="ulchildlink"><strong><a href="dds_03_0044.html">Changing a Parameter Group Description</a></strong><br>
</li>
<li class="ulchildlink"><strong><a href="dds_03_0016.html">Deleting a Parameter Group</a></strong><br>
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</ul>
<div class="familylinks">
<div class="parentlink"><strong>Parent topic:</strong> <a href="dds_03_0001.html">Managing DDS DB Instances</a></div>
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