downward_api_pod_volume.yaml

apiVersion: v1
kind: Pod
metadata:
  name: pod-down
  labels:
    run: app
    version: v1
  annotations:
    running-pod/v1: fast
    kubernetes-practice/pod: may
spec:
  containers:
    - image: nginx:alpine
      name: aone
      volumeMounts:
        - name: vol
          mountPath: /tmp/
  volumes:
    - name: vol
      downwardAPI:
        items:                  # Can mount labels and annotations through volumes with downwardAPI.items
        - fieldRef:
            fieldPath: metadata.labels
          path: "LABELS"
      #   mode: 
        - resourceFieldRef:
            containerName: downward
            resource: limits.memory
      #     divisor: 1ki
          path: "LIMIT_MEMORY"
        - resourceFieldRef:
            containerName: aone
            resource: requests.cpu
          path: "REQUEST_CPU"
        - fieldRef:
            fieldPath: metadata.annotations
          path: "ANNOTATIONS"
        - fieldRef:
            fieldPath: metadata.namespace
          path: "NAMESPACE"