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Reviewed-by: Eotvos, Oliver <oliver.eotvos@t-systems.com> Co-authored-by: qiujiandong1 <qiujiandong1@huawei.com> Co-committed-by: qiujiandong1 <qiujiandong1@huawei.com>
46 lines
3.6 KiB
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46 lines
3.6 KiB
HTML
<a name="cce_10_0891"></a><a name="cce_10_0891"></a>
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<h1 class="topictitle1">Configuring Specified Node Scheduling (nodeSelector)</h1>
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<div id="body0000001910802569"><p id="cce_10_0891__p8060118">To select a node for scheduling in Kubernetes, simply configure the <strong id="cce_10_0891__b22814326539">nodeSelector</strong> field in the workload. This field allows you to configure the label of the desired node to be scheduled. Kubernetes schedules pods only to nodes with specified labels.</p>
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<div class="section" id="cce_10_0891__section39217236524"><h4 class="sectiontitle">Prerequisites</h4><p id="cce_10_0891__p1871815210446">A custom label has been added to the target node so that workload pods can be scheduled based on the node label. For details, see <a href="cce_10_0004.html#cce_10_0004__section33951611481">Adding or Deleting a Node Label</a>.</p>
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</div>
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<div class="section" id="cce_10_0891__section1652711330565"><h4 class="sectiontitle">Creating a Workload Scheduled to a Specified Node</h4><ol id="cce_10_0891__ol129221949874"><li id="cce_10_0891__li367719515229"><span>Use kubectl to access the cluster. For details, see <a href="cce_10_0107.html">Accessing a Cluster Using kubectl</a>.</span></li><li id="cce_10_0891__li767713516221"><span>Create a YAML file named <strong id="cce_10_0891__b16565171545817">nginx.yaml</strong>. The file name can be customized.</span><p><div class="p" id="cce_10_0891__p28578015812">Configure nodeSelector for the workload. For example, if the key is <strong id="cce_10_0891__b10936103142315">deploy_qa</strong> and the value is <strong id="cce_10_0891__b19936131152317">true</strong>, the pod will be scheduled to the node with the <strong id="cce_10_0891__b2936173116234">deploy_qa=true</strong> label. Example:<pre class="screen" id="cce_10_0891__screen191412225599">apiVersion: apps/v1
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kind: Deployment
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metadata:
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name: nginx
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spec:
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replicas: 3
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selector:
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matchLabels:
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app: nginx
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template:
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metadata:
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labels:
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app: nginx
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spec:
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<strong id="cce_10_0891__b1624117278578"> nodeSelector: </strong>
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<strong id="cce_10_0891__b1424312745717"> deploy_qa: "true"</strong>
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containers:
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- image: nginx:latest
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imagePullPolicy: IfNotPresent
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name: nginx
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imagePullSecrets:
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- name: default-secret</pre>
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</div>
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</p></li><li id="cce_10_0891__li586915442817"><span>Create a workload.</span><p><pre class="screen" id="cce_10_0891__screen74492541889">kubectl apply -f nginx.yaml</pre>
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</p></li><li id="cce_10_0891__li1527319734716"><span>Verify that all pods run on the target node.</span><p><pre class="screen" id="cce_10_0891__screen17848748125316">kubectl get pod -o wide</pre>
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<p id="cce_10_0891__p10354173325315">In the following command output, node 192.168.0.103 is labeled with <strong id="cce_10_0891__b187741817112510">deploy_qa=true</strong>:</p>
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<pre class="screen" id="cce_10_0891__screen19265144016532">NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
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nginx-66859f4f48-xgp2g 1/1 Running 0 6h57m 172.16.3.0 192.168.0.103 <none> <none>
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nginx-66859f4f48-t9gqj 1/1 Running 0 6h57m 172.16.3.1 192.168.0.103 <none> <none>
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nginx-66859f4f48-2grhq 1/1 Running 0 6h57m 172.16.3.2 192.168.0.103 <none> <none></pre>
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</p></li></ol>
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</div>
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</div>
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<div>
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<div class="familylinks">
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<div class="parentlink"><strong>Parent topic:</strong> <a href="cce_10_0889.html">Scheduling a Workload</a></div>
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</div>
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</div>
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