k8s 移除node 全过程
可以看到node3上有 5个pod[root@VM-2-5-centos ~]# kubectl get pod -A -owideNAMESPACENAMEREADYSTATUSRESTARTSAGEIPNODENOMINATED NODEREADINESS GATESkube-systemcalico-kube.
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可以看到node3上有 5个pod
[root@VM-2-5-centos ~]# kubectl get pod -A -owide
NAMESPACE NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
kube-system calico-kube-controllers-97769f7c7-8hk6l 1/1 Running 0 4h25m 10.244.169.193 vm-2-15-centos <none> <none>
kube-system calico-node-gxlpl 1/1 Running 0 4h25m 172.16.2.3 vm-2-3-centos <none> <none>
kube-system calico-node-mlbg4 1/1 Running 0 4h25m 172.16.2.15 vm-2-15-centos <none> <none>
kube-system calico-node-sxdfw 1/1 Running 0 4h25m 172.16.2.5 vm-2-5-centos <none> <none>
kube-system coredns-7f89b7bc75-lgvr2 1/1 Running 0 4h28m 10.244.169.194 vm-2-15-centos <none> <none>
kube-system coredns-7f89b7bc75-phvhn 1/1 Running 0 4h28m 10.244.169.195 vm-2-15-centos <none> <none>
kube-system etcd-vm-2-5-centos 1/1 Running 0 4h28m 172.16.2.5 vm-2-5-centos <none> <none>
kube-system kube-apiserver-vm-2-5-centos 1/1 Running 0 4h28m 172.16.2.5 vm-2-5-centos <none> <none>
kube-system kube-controller-manager-vm-2-5-centos 1/1 Running 0 4h28m 172.16.2.5 vm-2-5-centos <none> <none>
kube-system kube-proxy-8pcct 1/1 Running 0 4h27m 172.16.2.15 vm-2-15-centos <none> <none>
kube-system kube-proxy-br94b 1/1 Running 0 4h27m 172.16.2.3 vm-2-3-centos <none> <none>
kube-system kube-proxy-z2xcz 1/1 Running 0 4h28m 172.16.2.5 vm-2-5-centos <none> <none>
kube-system kube-scheduler-vm-2-5-centos 1/1 Running 0 4h28m 172.16.2.5 vm-2-5-centos <none> <none>
kube-system metrics-server-b66888848-kdf7q 1/1 Running 0 4h23m 10.244.71.1 vm-2-3-centos <none> <none>
[root@VM-2-5-centos ~]# kubectl get node
NAME STATUS ROLES AGE VERSION
vm-2-15-centos Ready <none> 4h27m v1.20.4
vm-2-3-centos Ready <none> 4h28m v1.20.4
vm-2-5-centos Ready control-plane,master 4h29m v1.20.4
设置pod 不可调度
[root@VM-2-5-centos ~]# kubectl cordon vm-2-15-centos
node/vm-2-15-centos cordoned
[root@VM-2-5-centos ~]# kubectl get node
NAME STATUS ROLES AGE VERSION
vm-2-15-centos Ready,SchedulingDisabled <none> 4h28m v1.20.4
vm-2-3-centos Ready <none> 4h28m v1.20.4
vm-2-5-centos Ready control-plane,master 4h30m v1.20.4
驱逐node3 上的 pod，报错
[root@VM-2-5-centos ~]# kubectl drain vm-2-15-centos --ignore-daemonsets=false
node/vm-2-15-centos already cordoned
error: unable to drain node "vm-2-15-centos", aborting command...
There are pending nodes to be drained:
vm-2-15-centos
error: cannot delete DaemonSet-managed Pods (use --ignore-daemonsets to ignore): kube-system/calico-node-mlbg4, kube-system/kube-proxy-8pcct
再次执行，告警：daemonset 无法驱逐，不用管，一般接收流量的pod 被驱逐就好了
[root@VM-2-5-centos ~]# kubectl drain vm-2-15-centos --ignore-daemonsets
node/vm-2-15-centos already cordoned
WARNING: ignoring DaemonSet-managed Pods: kube-system/calico-node-mlbg4, kube-system/kube-proxy-8pcct
evicting pod kube-system/coredns-7f89b7bc75-phvhn
evicting pod kube-system/calico-kube-controllers-97769f7c7-8hk6l
evicting pod kube-system/coredns-7f89b7bc75-lgvr2
pod/calico-kube-controllers-97769f7c7-8hk6l evicted
pod/coredns-7f89b7bc75-phvhn evicted
pod/coredns-7f89b7bc75-lgvr2 evicted
node/vm-2-15-centos evicted
可以看到node是不可用状态
[root@VM-2-5-centos ~]# kubectl get node -A
NAME STATUS ROLES AGE VERSION
vm-2-15-centos Ready,SchedulingDisabled <none> 4h32m v1.20.4
vm-2-3-centos Ready <none> 4h32m v1.20.4
vm-2-5-centos Ready control-plane,master 4h33m v1.20.4
删除node
[root@VM-2-5-centos ~]# kubectl delete node vm-2-15-centos
node "vm-2-15-centos" deleted
这里我们可以看到node被删除，pod 还没消失，还有2个daemonset 程序这里需要等待30s
[root@VM-2-5-centos ~]# kubectl get pod -A -owide
NAMESPACE NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
kube-system calico-kube-controllers-97769f7c7-zjpr6 1/1 Running 0 102s 10.244.71.2 vm-2-3-centos <none> <none>
kube-system calico-node-gxlpl 1/1 Running 0 4h32m 172.16.2.3 vm-2-3-centos <none> <none>
kube-system calico-node-mlbg4 1/1 Running 0 4h32m 172.16.2.15 vm-2-15-centos <none> <none>
kube-system calico-node-sxdfw 1/1 Running 0 4h32m 172.16.2.5 vm-2-5-centos <none> <none>
kube-system coredns-7f89b7bc75-5d29s 1/1 Running 0 102s 10.244.71.3 vm-2-3-centos <none> <none>
kube-system coredns-7f89b7bc75-6rl9q 1/1 Running 0 102s 10.244.71.4 vm-2-3-centos <none> <none>
kube-system etcd-vm-2-5-centos 1/1 Running 0 4h34m 172.16.2.5 vm-2-5-centos <none> <none>
kube-system kube-apiserver-vm-2-5-centos 1/1 Running 0 4h34m 172.16.2.5 vm-2-5-centos <none> <none>
kube-system kube-controller-manager-vm-2-5-centos 1/1 Running 0 4h34m 172.16.2.5 vm-2-5-centos <none> <none>
kube-system kube-proxy-8pcct 1/1 Running 0 4h33m 172.16.2.15 vm-2-15-centos <none> <none>
kube-system kube-proxy-br94b 1/1 Running 0 4h33m 172.16.2.3 vm-2-3-centos <none> <none>
kube-system kube-proxy-z2xcz 1/1 Running 0 4h34m 172.16.2.5 vm-2-5-centos <none> <none>
kube-system kube-scheduler-vm-2-5-centos 1/1 Running 0 4h34m 172.16.2.5 vm-2-5-centos <none> <none>
kube-system metrics-server-b66888848-kdf7q 1/1 Running 0 4h29m 10.244.71.1 vm-2-3-centos <none> <none>
[root@VM-2-5-centos ~]# kubectl get node
NAME STATUS ROLES AGE VERSION
vm-2-3-centos Ready <none> 4h34m v1.20.4
vm-2-5-centos Ready control-plane,master 4h35m v1.20.4
再次查看已删除
[root@VM-2-5-centos ~]# kubectl get pod -A -owide
NAMESPACE NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
kube-system calico-kube-controllers-97769f7c7-zjpr6 1/1 Running 0 2m50s 10.244.71.2 vm-2-3-centos <none> <none>
kube-system calico-node-gxlpl 1/1 Running 0 4h33m 172.16.2.3 vm-2-3-centos <none> <none>
kube-system calico-node-sxdfw 1/1 Running 0 4h33m 172.16.2.5 vm-2-5-centos <none> <none>
kube-system coredns-7f89b7bc75-5d29s 1/1 Running 0 2m50s 10.244.71.3 vm-2-3-centos <none> <none>
kube-system coredns-7f89b7bc75-6rl9q 1/1 Running 0 2m50s 10.244.71.4 vm-2-3-centos <none> <none>
kube-system etcd-vm-2-5-centos 1/1 Running 0 4h36m 172.16.2.5 vm-2-5-centos <none> <none>
kube-system kube-apiserver-vm-2-5-centos 1/1 Running 0 4h36m 172.16.2.5 vm-2-5-centos <none> <none>
kube-system kube-controller-manager-vm-2-5-centos 1/1 Running 0 4h36m 172.16.2.5 vm-2-5-centos <none> <none>
kube-system kube-proxy-br94b 1/1 Running 0 4h35m 172.16.2.3 vm-2-3-centos <none> <none>
kube-system kube-proxy-z2xcz 1/1 Running 0 4h35m 172.16.2.5 vm-2-5-centos <none> <none>
kube-system kube-scheduler-vm-2-5-centos 1/1 Running 0 4h36m 172.16.2.5 vm-2-5-centos <none> <none>
kube-system metrics-server-b66888848-kdf7q 1/1 Running 0 4h30m 10.244.71.1 vm-2-3-centos <none> <none>
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