kubernetes 设置 Master 可调度与不可调度
语法
kubectl taint node [node] key=value[effect]
[effect] 可取值: [ NoSchedule | PreferNoSchedule | NoExecute ]
NoSchedule: 肯定不能被调度
PreferNoSchedule: 尽量不要调度
NoExecute: 不仅不会调度, 还会驱赶Node上已有的Pod
勾销污点
勾销污点[root@k8s-master01 ~]# kubectl taint node k8s-master node-role.kubernetes.io/master-设置污点
# 设置为肯定不能被调度[root@k8s-master01 ~]# kubectl taint node k8s-master01 node-role.kubernetes.io/master="":NoSchedulenode/k8s-master01 tainted[root@k8s-master01 ~]# kubectl taint node k8s-master02 node-role.kubernetes.io/master="":NoSchedulenode/k8s-master02 tainted[root@k8s-master01 ~]# kubectl taint node k8s-master03 node-role.kubernetes.io/master="":NoSchedulenode/k8s-master03 tainted[root@k8s-master01 ~]# # 查看污点[root@k8s-master01 ~]# kubectl describe node | grep TaTaints: node-role.kubernetes.io/master:NoScheduleTaints: node-role.kubernetes.io/master:NoScheduleTaints: node-role.kubernetes.io/master:NoScheduleTaints: <none>Taints: <none>Taints: <none>Taints: <none>Taints: <none>[root@k8s-master01 ~]# 查看验证
# 查看曾经调度到maser上的pod没有被驱赶[root@k8s-master01 ~]# kubectl get pod -o wideNAMESPACE NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATESdefault hostname-test-cby-58d85dccdb-7zgjj 1/1 Running 1 (2d1h ago) 19d 172.25.244.195 k8s-master01 <none> <none>default hostname-test-cby-58d85dccdb-8t7zv 1/1 Running 1 (2d1h ago) 19d 172.25.244.196 k8s-master01 <none> <none>default hostname-test-cby-58d85dccdb-9bqsq 1/1 Running 1 (2d1h ago) 19d 172.25.92.74 k8s-master02 <none> <none>default hostname-test-cby-58d85dccdb-jj2ml 1/1 Running 1 (2d1h ago) 19d 172.17.125.3 k8s-node01 <none> <none>default hostname-test-cby-58d85dccdb-k96zl 1/1 Running 1 (2d1h ago) 19d 172.18.195.3 k8s-master03 <none> <none>default hostname-test-cby-58d85dccdb-lng8b 1/1 Running 1 (2d1h ago) 19d 172.29.115.131 k8s-node04 <none> <none>default hostname-test-cby-58d85dccdb-lsrbg 1/1 Running 1 (2d1h ago) 19d 172.25.214.195 k8s-node03 <none> <none>default hostname-test-cby-58d85dccdb-mlv24 1/1 Running 1 (2d1h ago) 19d 172.17.54.131 k8s-node05 <none> <none>default hostname-test-cby-58d85dccdb-p5vc8 1/1 Running 1 (2d1h ago) 19d 172.27.14.195 k8s-node02 <none> <none>default hostname-test-cby-58d85dccdb-z6ptf 1/1 Running 1 (2d1h ago) 19d 172.25.214.196 k8s-node03 <none> <none>[root@k8s-master01 ~]# 设置污点
# 设置为不仅不会调度, 还会驱赶Node上已有的Pod[root@k8s-master01 ~]# kubectl taint node k8s-master03 node-role.kubernetes.io/master="":NoExecutenode/k8s-master03 tainted[root@k8s-master01 ~]# kubectl taint node k8s-master02 node-role.kubernetes.io/master="":NoExecutenode/k8s-master02 tainted[root@k8s-master01 ~]# kubectl taint node k8s-master01 node-role.kubernetes.io/master="":NoExecutenode/k8s-master01 tainted# 查看污点[root@k8s-master01 ~]# kubectl describe node | grep TaTaints: node-role.kubernetes.io/master:NoExecuteTaints: node-role.kubernetes.io/master:NoExecuteTaints: node-role.kubernetes.io/master:NoExecuteTaints: <none>Taints: <none>Taints: <none>Taints: <none>Taints: <none>[root@k8s-master01 ~]# 查看验证
# 查看曾经调度到master节点的pod已进行驱赶[root@k8s-master01 ~]# kubectl get pod -A -o wideNAMESPACE NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATESdefault mysql-0 2/2 Running 0 34m 172.27.14.206 k8s-node02 <none> <none>default mysql-1 2/2 Running 0 34m 172.17.125.11 k8s-node01 <none> <none>default mysql-2 2/2 Terminating 0 34m 172.18.195.10 k8s-master03 <none> <none>[root@k8s-master01 ~]# https://www.oiox.cn/
https://www.chenby.cn/
https://cby-chen.github.io/
https://blog.csdn.net/qq_3392...
https://my.oschina.net/u/3981543
https://www.zhihu.com/people/...
https://segmentfault.com/u/hp...
https://juejin.cn/user/331578...
https://cloud.tencent.com/dev...
https://www.jianshu.com/u/0f8...
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