Search code examples
kubernetesvolumeconfigmap

Use Configmap Value in NodeSelectorTerms Entry

The nodeSelectorTerms in a PersistentVolume help the volume identify which node to bind to. For example:

nodeAffinity:
    required:
      nodeSelectorTerms:
      - matchExpressions:
        - key: kubernetes.io/hostname
          operator: In
          values:
          - mynodename

means that we only want to bind to a node of the name mynodename.

I would like to replace mynodename with a variable defined in a configMap. For example, the following syntax is what I was imagining, but it does not work:

nodeAffinity:
    required:
      nodeSelectorTerms:
      - matchExpressions:
        - key: kubernetes.io/hostname
          operator: In
          values:
          - valueFrom:
              configMapKeyRef:
                name: my-configmap
                key: MYNODENAME

where my-configmap is a configmap and MYNODENAME is a variable in it.

Can I achieve this somehow?

Solution

  • This is not supported. Apparently I need more words than just that.