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: 一定不能被调度
PreferNoSchedule: 尽量不要调度
NoExecute: 不仅不会调度, 还会驱逐Node上已有的Pod
取消污点
取消污点
[root@k8s-master01 ~]# kubectl taint node k8s-master node-role.kubernetes.io/master-设置污点
# 设置为一定不能被调度
[root@k8s-master01 ~]# kubectl taint node k8s-master01 node-role.kubernetes.io/master="":NoSchedule
node/k8s-master01 tainted
[root@k8s-master01 ~]# kubectl taint node k8s-master02 node-role.kubernetes.io/master="":NoSchedule
node/k8s-master02 tainted
[root@k8s-master01 ~]# kubectl taint node k8s-master03 node-role.kubernetes.io/master="":NoSchedule
node/k8s-master03 tainted
[root@k8s-master01 ~]#
# 查看污点
[root@k8s-master01 ~]# kubectl describe node | grep Ta
Taints: node-role.kubernetes.io/master:NoSchedule
Taints: node-role.kubernetes.io/master:NoSchedule
Taints: node-role.kubernetes.io/master:NoSchedule
Taints: <none>
Taints: <none>
Taints: <none>
Taints: <none>
Taints: <none>
[root@k8s-master01 ~]# 查看验证
# 查看已经调度到maser上的pod没有被驱逐
[root@k8s-master01 ~]# kubectl get pod -o wide
NAMESPACE NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
default 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, 还会驱逐Node上已有的Pod
[root@k8s-master01 ~]# kubectl taint node k8s-master03 node-role.kubernetes.io/master="":NoExecute
node/k8s-master03 tainted
[root@k8s-master01 ~]# kubectl taint node k8s-master02 node-role.kubernetes.io/master="":NoExecute
node/k8s-master02 tainted
[root@k8s-master01 ~]# kubectl taint node k8s-master01 node-role.kubernetes.io/master="":NoExecute
node/k8s-master01 tainted
# 查看污点
[root@k8s-master01 ~]# kubectl describe node | grep Ta
Taints: node-role.kubernetes.io/master:NoExecute
Taints: node-role.kubernetes.io/master:NoExecute
Taints: node-role.kubernetes.io/master:NoExecute
Taints: <none>
Taints: <none>
Taints: <none>
Taints: <none>
Taints: <none>
[root@k8s-master01 ~]# 查看验证
# 查看已经调度到master节点的pod已进行驱逐
[root@k8s-master01 ~]# kubectl get pod -A -o wide
NAMESPACE NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
default 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>
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