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oam/knowledge base/drain a k8s cluster node.md
Michele Cereda ea15e19e80 Added notes about k8s node draining to the knowledge base
2022-05-15 00:43:45 +02:00

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Drain a K8S cluster node

  1. mark the node as unschedulable (cordon):

    $ kubectl cordon kworker-rj2
node/kworker-rj2 cordoned

  2. remove pods running on the node:

    $ kubectl drain kworker-rj2 --grace-period=300 --ignore-daemonsets=true
node/kworker-rj2 already cordoned
WARNING: ignoring DaemonSet-managed Pods: kube-system/calico-node-fl8dl, kube-system/kube-proxy-95vdf
evicting pod default/my-dep-557548758d-d2pmd
pod/my-dep-557548758d-d2pmd evicted
node/kworker-rj2 evicted

  3. do to the node what you need to do

  4. make the node available again:

    $ kubectl uncordon kworker-rj2
node/kworker-rj2 uncordoned

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