kubernetes 的 Taints and Tolerations(污点和耐性)

深碍√TFBOYSˉ_ 2022-04-23 09:32 112阅读 0赞

Taints and Tolerations 是pod的一个属性，它将允许某些pod在指定的节点上或者不允许指定的pod到指定节点上或者必须要有某些的pod才能调度到指定节点上

可以通过`kubectl taint` 来执行  
例如

添加 Taints and Tolerations

kubectl taint nodes node1 key=value:NoSchedule
    
    -------node1:节点名称 -------key 就是key -------value 就是value -------效果是 NoSchedule 意思是说只有拥有: key=value:NoSchedule这个属性的pod才能调度到node1上

删除Taints and Tolerations

kubectl taint nodes node1 key:NoSchedule-

该属性是在`PodSpec`下，只有这个值才能被调度到node1上

tolerations:
    - key: "key"
      operator: "Equal"
      value: "value"
      effect: "NoSchedule"

tolerations:
    - key: "key"
      operator: "Exists"
      effect: "NoSchedule"

以上表示只有key=’key’ value=’value’ 或者 存在key=’key’的pod才会调度到node1上

`Operator`默认是`Equal`

tolerations:
    - operator: "Exists" 这中情况 Exists的空键匹配所有的键，值和效果，这意味着这将容忍一切

tolerations:
    - key: "key"
      operator: "Exists"
      匹配key="key"键关键字的所有效果。

kubectl taint nodes node1 key1=value1:NoSchedule kubectl taint nodes node1 key1=value1:NoExecute kubectl taint nodes node1 key2=value2:NoSchedule

pod要生成以下

tolerations:
    - key: "key1"
      operator: "Equal"
      value: "value1"
      effect: "NoSchedule"
    - key: "key1"
      operator: "Equal"
      value: "value1"
      effect: "NoExecute"

未完待续

参考  
[taint-and-toleration][]

[taint-and-toleration]: https://kubernetes.io/docs/concepts/configuration/taint-and-toleration/