7.5.2. Understanding how to consume container values using the downward API

Procedure

1. Create a new pod spec that contains the environment variables you want the container to consume:

   1. Create a pod.yaml file similar to the following:

      apiVersion: v1
      kind: Pod
      metadata:
        name: dapi-env-test-pod
      spec:
        securityContext:
          runAsNonRoot: true
          seccompProfile:
            type: RuntimeDefault
        containers:
          - name: env-test-container
            image: gcr.io/google_containers/busybox
            command: [ "/bin/sh", "-c", "env" ]
            env:
              - name: MY_POD_NAME
                valueFrom:
                  fieldRef:
                    fieldPath: metadata.name
              - name: MY_POD_NAMESPACE
                valueFrom:
                  fieldRef:
                    fieldPath: metadata.namespace
            securityContext:
              allowPrivilegeEscalation: false
              capabilities:
                drop: [ALL]
        restartPolicy: Never
      # ...

      where:

      spec.containers.env.valueFrom.fieldRef.fieldPath

      Specifies that the environment variable gets its value from the specified pod value, either metadata.name for the pod name or metadata.namespace for the pod namespace, instead of a literal value specified by a value field.

   2. Create the pod from the pod.yaml file by using the following command:

      $ oc create -f pod.yaml