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Node_Affinity_Example

Node Affinity Example​

spec:
  affinity:
    nodeAffinity: 
      requiredDuringSchedulingIgnoredDuringExecution:  
        nodeSelectorTerms:
        - matchExpressions:
          - key: kubernetes.io/colo-tx-name
            operator: In
            values:
            - tx-aus
            - tx-dal
      preferredDuringSchedulingIgnoredDuringExecution:
      - weight: 1
        preference:
          matchExpressions:
          - key: disk-speed
            operator: In
            values:
            - fast
            - quick

The first nodeAffinity rule requires a node with a key of kubernetes.io/colo-tx-name which has one of two possible values: tx-aus or tx-dal.

The second rule gives extra weight to nodes with a key of disk-speed with a value of fast or quick. The Pod will be scheduled on some node - in any case, this just prefers a particular label.