6.5.2.2. 使用卷插件消耗容器值

容器可以使用卷插件来消耗 API 值。

容器可以消耗:

  • Pod 名称
  • Pod 项目/命名空间
  • Pod 注解
  • Pod 标签

流程

使用卷插件:

  1. 创建 volume-pod.yaml 文件:

    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:
      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
      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. volume-pod.yaml 文件创建 pod:

    $ oc create -f volume-pod.yaml
  3. 检查容器的日志,并验证配置的字段是否存在:

    $ oc logs -p dapi-volume-test-pod

    输出示例

    cluster=downward-api-test-cluster1
    rack=rack-123
    zone=us-east-coast
    annotation1=345
    annotation2=456
    kubernetes.io/config.source=api