Kubernetes节点上线和下线：节点下线

1、下线之前，先在master01节点上创建一个测试Deployment

[root@master01 ~]# kubectl create deployment testdp2 --image=registry.cn-hangzhou.aliyuncs.com/zq-demo/nginx:1.14.2 --replicas=7

查看pod

[root@master01 ~]# kubectl get po -owide
NAME                       READY   STATUS    RESTARTS   AGE   IP               NODE       NOMINATED NODE   READINESS GATES
testdp2-6d9fbdb8cb-5bbrf   1/1     Running   0          32s   172.29.55.6      node01     <none>           <none>
testdp2-6d9fbdb8cb-8bsc9   1/1     Running   0          32s   172.19.75.194    node03     <none>           <none>
testdp2-6d9fbdb8cb-bx67h   1/1     Running   0          32s   172.21.231.134   node02     <none>           <none>
testdp2-6d9fbdb8cb-clkdl   1/1     Running   0          32s   172.18.71.1      master03   <none>           <none>
testdp2-6d9fbdb8cb-f8dbw   1/1     Running   0          32s   172.19.75.193    node03     <none>           <none>
testdp2-6d9fbdb8cb-q9hf7   1/1     Running   0          32s   172.20.59.197    master02   <none>           <none>
testdp2-6d9fbdb8cb-xc9hp   1/1     Running   0          32s   172.31.112.131   master01   <none>           <none>

2、在master01节点上驱逐下线节点node03上的Pod，并设置不可调度

[root@master01 ~]# kubectl drain node03  --ignore-daemonsets

再次查看Pod,观察到node03节点上无Pod运行

[root@master01 ~]# kubectl get po -owide
NAME                       READY   STATUS    RESTARTS   AGE     IP               NODE       NOMINATED NODE   READINESS GATES
testdp2-6d9fbdb8cb-5bbrf   1/1     Running   0          3m20s   172.29.55.6      node01     <none>           <none>
testdp2-6d9fbdb8cb-6pgv7   1/1     Running   0          4s      172.21.231.135   node02     <none>           <none>
testdp2-6d9fbdb8cb-9wzdx   1/1     Running   0          4s      172.29.55.7      node01     <none>           <none>
testdp2-6d9fbdb8cb-bx67h   1/1     Running   0          3m20s   172.21.231.134   node02     <none>           <none>
testdp2-6d9fbdb8cb-clkdl   1/1     Running   0          3m20s   172.18.71.1      master03   <none>           <none>
testdp2-6d9fbdb8cb-q9hf7   1/1     Running   0          3m20s   172.20.59.197    master02   <none>           <none>
testdp2-6d9fbdb8cb-xc9hp   1/1     Running   0          3m20s   172.31.112.131   master01   <none>           <none>

3、在master01节点上恢复node03节点可调度

[root@master01 ~]# kubectl uncordon node03

4、在master01节点上移除node03节点

[root@master01 ~]# kubectl delete node node03

验证查看

[root@master01 ~]# kubectl get node
NAME       STATUS   ROLES           AGE   VERSION
master01   Ready    control-plane   18h   v1.26.9
master02   Ready    control-plane   18h   v1.26.9
master03   Ready    control-plane   18h   v1.26.9
node01     Ready    <none>          18h   v1.26.9
node02     Ready    <none>          18h   v1.26.9

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