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title | content_template | weight |
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Assign Pods to Nodes | templates/task | 120 |
{{% capture overview %}} This page shows how to assign a Kubernetes Pod to a particular node in a Kubernetes cluster. {{% /capture %}}
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Add a label to a node
-
List the nodes in your cluster:
kubectl get nodes
The output is similar to this:
NAME STATUS AGE VERSION worker0 Ready 1d v1.6.0+fff5156 worker1 Ready 1d v1.6.0+fff5156 worker2 Ready 1d v1.6.0+fff5156
-
Chose one of your nodes, and add a label to it:
kubectl label nodes <your-node-name> disktype=ssd
where
<your-node-name>
is the name of your chosen node. -
Verify that your chosen node has a
disktype=ssd
label:kubectl get nodes --show-labels
The output is similar to this:
NAME STATUS AGE VERSION LABELS worker0 Ready 1d v1.6.0+fff5156 ...,disktype=ssd,kubernetes.io/hostname=worker0 worker1 Ready 1d v1.6.0+fff5156 ...,kubernetes.io/hostname=worker1 worker2 Ready 1d v1.6.0+fff5156 ...,kubernetes.io/hostname=worker2
In the preceding output, you can see that the
worker0
node has adisktype=ssd
label.
Create a pod that gets scheduled to your chosen node
This pod configuration file describes a pod that has a node selector,
disktype: ssd
. This means that the pod will get scheduled on a node that has
a disktype=ssd
label.
{{< codenew file="pods/pod-nginx.yaml" >}}
-
Use the configuration file to create a pod that will get scheduled on your chosen node:
kubectl create -f https://k8s.io/docs/tasks/configure-pod-container/pod.yaml
-
Verify that the pod is running on your chosen node:
kubectl get pods --output=wide
The output is similar to this:
NAME READY STATUS RESTARTS AGE IP NODE nginx 1/1 Running 0 13s 10.200.0.4 worker0
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{{% capture whatsnext %}} Learn more about labels and selectors. {{% /capture %}}