pod_use_downwardAPI.yaml

# 此模板演示了如何使用 环境变量和存储卷 方式注入Pod信息到Pod内部
apiVersion: v1
kind: Pod
metadata:
  name: busybox-use-downwardapi
  labels:
    app: busybox
    label_test: some_value
spec:
  containers:
    - name: write
      image: busybox
      command: [ "sh", "-c" ]
      # 通过命令行可以读取环境变量
      args: [ 'echo "hellok8s, downwardAPI! PodName=${POD_NAME} LIMITS_CPU=${LIMITS_CPU} POD_IP=${POD_IP}"; sleep infinity' ]
      resources:
        limits:
          cpu: "0.1"
      env:
        - name: POD_NAME
          valueFrom:
            fieldRef:
              fieldPath: metadata.name
        - name: LIMITS_CPU
          valueFrom:
            resourceFieldRef:
              resource: limits.cpu
        - name: POD_IP
          valueFrom:
            fieldRef:
              fieldPath: status.podIP
      volumeMounts:
        - mountPath: /config/downward_api_info
          name: volume-downward
  volumes:
    - name: volume-downward
      downwardAPI:
        items:
          - path: "POD_NAME"
            fieldRef:
              fieldPath:  metadata.name
          - path: "LABELS"
            fieldRef:
              fieldPath: metadata.labels