downward_api_pod_env.yaml

apiVersion: v1
kind: Pod
metadata:
  name: downside
  labels:
    run: app
  annotations:
    running-kubernetes.io/pod: downward
    example.io/pod: revision-1
spec:
  containers:
    - image: nginx:1.7.9
      name: downward
      workingDir: /root/
      resources:
        requests:
          cpu: 1
          memory: '500Mi'      # 500Mi --> 500 MebiBytes
        limits:
          cpu: 2             
          memory: '1Gi'
      env:
        - name: "NODE_NAME"
          valueFrom:               # fieldRef is for Pod Specification
            fieldRef:
              fieldPath: spec.nodeName
        # - name: POD_LABEL
        #   valueFrom:
        #     fieldRef:
        #       fieldPath: metadata.labels
        # - name: POD_ANNOTATION
        #   valueFrom:
        #     fieldRef:          # EnvVar not supported Annotations and Labels.
        #       fieldPath: metadata.annotations
        - name: "POD_NAME"
          valueFrom:
            fieldRef:
              fieldPath: metadata.name
        - name: "POD_NAMESPACE"
          valueFrom:
            fieldRef:
              fieldPath: metadata.namespace
        - name: "SERVICE_ACCOUNT"
          valueFrom:
            fieldRef:
              fieldPath: spec.serviceAccountName
        - name: "POD_IP"
          valueFrom:
            fieldRef:
              fieldPath: status.podIP
        - name: "CONTAINER_MEMORY"
          valueFrom:
            resourceFieldRef:
              resource: requests.memory
              containerName: downward
        - name: "CONTAINER_MEMORY"
          valueFrom:
            resourceFieldRef:
              resource: limits.memory
              containerName: downward
              # divisor: 1ki        # 1 KibiByte