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kuberneteskubectlconfigmap

configmaps are not passing properly to the containers

I have a kubectl config map like below.

apiVersion: v1
data:
  server.properties: |+
    server.hostname=test.com

kind: ConfigMap
metadata:
  name: my-config

And I tried to read this config inside a container.

containers:
        - name: testserver
          env:
            - name: server.hostname
              valueFrom:
                configMapKeyRef:
                  name: my-config
                  key: server.properties.server.hostname

However, these configs are not passing to the container properly. Do I need do any changes to my configs?

Solution

  • What you have in there isn't the right key. ConfigMaps are strictly 1 level of k/v pairs. The |+ syntax is YAML for a multiline string but the fact the data inside that is also YAML is not something the system knows. As far as Kubernetes is concerned you have one key there, server.properties, with a string value that is opaque.