K8s中容忍(Tolerations)详解

设置了污点的Node将根据taint的effect：NoSchedule、PreferNoSchedule、NoExecute和Pod之间产生互斥的关系，
Pod将在一定程度上不会被调度到Node上。
但我们可以在Pod上设置容忍 (Toleration)，意思是设置了容忍的Pod将可以容忍污点的存在，可以被调度到存在污点的Node上

tolerations:
  - key: "key1"
    operator: "Equal"
    value: "value1"
    effect: "NoSchedule"
    tolerationSeconds: 3600
  - key: "key1"
    operator: "Equal"
    value: "value1"
    effect: "NoExecute"
  - key: "key2"
    operator: "Exists"
    effect: "NoSchedule"

其中key,vaule,effect要与Node上设置的taint保持一致

operator的值为Exists将会忽略value值

tolerationSeconds 用于描述当 Pod 需要被驱逐时可以在 Pod 上继续保留运行的时间

tolerations:
- operator: "Exists"

tolerations:
- key: "key"
  operator: "Exists"

kubectl taint nodes Node-Name node-role.kubernetes.io/master=:PreferNoSchedule