暴露 Pod 和 Container 字段给运行的容器

环境变量

容器创建时运行的所有服务的列表都会作为环境变量提供给容器。

• 默认环境变量

查看环境变量：

env

• fieldRef
  • 使用pod字段

          env:
            - name: MY_NODE_NAME
              valueFrom:
                fieldRef:
                  fieldPath: spec.nodeName
            - name: MY_POD_NAME
              valueFrom:
                fieldRef:
                  fieldPath: metadata.name
            - name: MY_POD_NAMESPACE
              valueFrom:
                fieldRef:
                  fieldPath: metadata.namespace
            - name: MY_POD_IP
              valueFrom:
                fieldRef:
                  fieldPath: status.podIP
            - name: MY_POD_SERVICE_ACCOUNT
              valueFrom:
                fieldRef:
                  fieldPath: spec.serviceAccountName
    

  • 使用pod字段

          env:
            - name: MY_CPU_REQUEST
              valueFrom:
                resourceFieldRef:
                  containerName: test-container
                  resource: requests.cpu
            - name: MY_CPU_LIMIT
              valueFrom:
                resourceFieldRef:
                  containerName: test-container
                  resource: limits.cpu
            - name: MY_MEM_REQUEST
              valueFrom:
                resourceFieldRef:
                  containerName: test-container
                  resource: requests.memory
            - name: MY_MEM_LIMIT
              valueFrom:
                resourceFieldRef:
                  containerName: test-container
                  resource: limits.memory
    

downloadapi

• 获取pod字段 ``` volumes:
  • name: podinfo downwardAPI: items:

    - path: "labels"
      fieldRef:
        fieldPath: metadata.labels
    - path: "annotations"
      fieldRef:
        fieldPath: metadata.annotations
    

- 获取container字段

volumes:

- name: podinfo
  downwardAPI:
    items:
      - path: "cpu_limit"
        resourceFieldRef:
          containerName: client-container
          resource: limits.cpu
      - path: "cpu_request"
        resourceFieldRef:
          containerName: client-container
          resource: requests.cpu
      - path: "mem_limit"
        resourceFieldRef:
          containerName: client-container
          resource: limits.memory
      - path: "mem_request"
        resourceFieldRef:
          containerName: client-container
          resource: requests.memory

```