K8S node affinity nodeAffinity

一 、 nodeAffinity

Similar to nodeSelector, according to the label on the node to schedule the Pod to which nodes

Two, scheduling strategy

Hard strategy (required): must be satisfied, if not satisfied, the Pod is in the Pending state

Soft strategy (preferred): try to satisfy, but not guarantee

操作符：In、NotIn、Exists、DoseNotExist、Gt、Lt

Three, example

3.1.硬策略

affinity:
  nodeAffinity:
    requiredDuringSchedulingIgnoredDuringExecution:
      nodeSelectorTerms:
      - matchExpressions:
        - key: nodeType
          operator: In
          values:
          - dev

3.2.软策略

affinity:
  nodeAffinity:
    preferredDuringSchedulingIgnoredDuringExecution:
    - weight: 1
      preference:
        matchExpressions:
        - key: nodeType
          operator: In
          values:
          - test

If there is no node with nodeType=test label, it will be scheduled to other nodes, which is more relaxed than the hard policy