7.5.2.2. Consuming container values using a volume plugin

Procedure

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

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

      kind: Pod
      apiVersion: v1
      metadata:
        labels:
          zone: us-east-coast
          cluster: downward-api-test-cluster1
          rack: rack-123
        name: dapi-volume-test-pod
        annotations:
          annotation1: "345"
          annotation2: "456"
      spec:
        securityContext:
          runAsNonRoot: true
          seccompProfile:
            type: RuntimeDefault
        containers:
          - name: volume-test-container
            image: gcr.io/google_containers/busybox
            command: ["sh", "-c", "cat /tmp/etc/pod_labels /tmp/etc/pod_annotations"]
            volumeMounts:
              - name: podinfo
                mountPath: /tmp/etc
                readOnly: false
            securityContext:
              allowPrivilegeEscalation: false
              capabilities:
                drop: [ALL]
        volumes:
        - name: podinfo
          downwardAPI:
            defaultMode: 420
            items:
            - fieldRef:
                fieldPath: metadata.name
              path: pod_name
            - fieldRef:
                fieldPath: metadata.namespace
              path: pod_namespace
            - fieldRef:
                fieldPath: metadata.labels
              path: pod_labels
            - fieldRef:
                fieldPath: metadata.annotations
              path: pod_annotations
        restartPolicy: Never
      # ...

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

      $ oc create -f volume-pod.yaml