设置节点不可用
    重新调度该节点上所有的pod

    1. [rancher@rmaster01 ~]$ kubectl get nodes
    2. NAME        STATUS   ROLES               AGE   VERSION
    3. node01      Ready    worker              23d   v1.19.8
    4. node02      Ready    worker              23d   v1.19.8
    5. rmaster01   Ready    controlplane,etcd   23d   v1.19.8
    6. rmaster02   Ready    controlplane,etcd   23d   v1.19.8
    7. rmaster03   Ready    controlplane,etcd   23d   v1.19.8
    8. [rancher@rmaster01 ~]$ kubectl cordon rmaster01 
    9. node/rmaster01 cordoned
    10. [rancher@rmaster01 ~]$ kubectl get nodes
    11. NAME        STATUS                     ROLES               AGE   VERSION
    12. node01      Ready                      worker              23d   v1.19.8
    13. node02      Ready                      worker              23d   v1.19.8
    14. rmaster01   Ready,SchedulingDisabled   controlplane,etcd   23d   v1.19.8
    15. rmaster02   Ready                      controlplane,etcd   23d   v1.19.8
    16. rmaster03   Ready                      controlplane,etcd   23d   v1.19.8
    17. [rancher@rmaster01 ~]$ kubectl drain rmaster01 --ignore-daemonsets --delete-local-data --force 
    18. node/rmaster01 already cordoned
    19. WARNING: ignoring DaemonSet-managed Pods: cattle-prometheus/exporter-node-cluster-monitoring-msmqz, cattle-system/cattle-node-agent-8rdtr, kube-system/canal-wczbn
    20. evicting pod kube-system/rke-network-plugin-deploy-job-tpt48
    21. evicting pod kube-system/rke-coredns-addon-deploy-job-snjhp
    22. evicting pod kube-system/rke-ingress-controller-deploy-job-2fvsw
    23. evicting pod kube-system/rke-metrics-addon-deploy-job-8drtr
    24. pod/rke-metrics-addon-deploy-job-8drtr evicted
    25. pod/rke-ingress-controller-deploy-job-2fvsw evicted
    26. pod/rke-coredns-addon-deploy-job-snjhp evicted
    27. pod/rke-network-plugin-deploy-job-tpt48 evicted
    28. node/rmaster01 evicted

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