Kubernetes apply nodeSelector via command

Question

Is there a way to apply a nodeSelector via command? (like kubectl apply )

It would be nice if it is applicable on running deployments or namespaces, otherwise applying to running pods is also fine.

Any tips are appreciated

Answer 1

You can use the kubectl patch command, like this:

kubectl patch deployments nginx-deployment -p '{"spec": {"template": {"spec": {"nodeSelector": {"kube.netes.io/hostname": "node-2"}}}}}'

After successful patch all pods of the deployment will be restarted on a node matching the selector.