kubernetes 設定 Master 可排程與不可排程

文法

kubectl taint node [node] key=value[effect]

[effect] 可取值: [ NoSchedule | PreferNoSchedule | NoExecute ]

NoSchedule: 一定不能被排程

PreferNoSchedule: 盡量不要排程

NoExecute: 不僅不會排程, 還會驅逐Node上已有的Pod

取消污點

取消污點[root@k8s-master01 ~]# kubectl taint node k8s-master node-role.kubernetes.io/master-      

設定污點

# 設定為一定不能被
# 設定為一定不能被排程

[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 ~]# 

# 檢視污點
[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 ~]#      

檢視驗證

# 檢視已經排程到maser上的pod沒有被驅逐
[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 ~]#      

設定污點

# 設定為不僅不會排程, 還會驅逐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

# 檢視污點
[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 ~]#      

檢視驗證

# 檢視已經排程到master節點的pod已進行驅逐
[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>
[root@k8s-master01 ~]#      

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https://www.zhihu.com/people/chen-bu-yun-2

https://segmentfault.com/u/hppyvyv6/articles

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