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node affinity.md

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node affinity

  • available types of affinity - requiredDuringSchedulingIgnoredDuringExecution - preferredDuringSchedulingIgnoredDuringExecution - requiredDuringSchedulingRequiredDuringExecution
DuringScheduling DuringExecution Comment
Type 1 Required Ignored If the labels arent found during scheduling, pod is not created. If labels are removed during execution pod isnt evicted from the node.
Type 2 Preferred Ignored If the labels are found will be scheduled to one of the matching nodes, else to any of the random nodes. If labels are removed during execution pod isnt evicted from the node.
Type 3 Required Required If the labels arent found during scheduling, pod is not created. If labels are removed during execution pod is evicted from the node. Will be available in future release.

definition

spec:
      containers:
            - name: nginx
              image: nginx
      affinity:
            requiredDuringSchedulingIgnoredDuringExecution:
                  nodeSelectorTerms:
                        - matchExpressions:
                              - key: size
                                operator: In|NotIn|Exists
                                values:
                                    - Large
                                    - Small