23.3.2. 使用卷插件

消耗 Downward API 的另一个机制是使用卷插件。Downward API 卷插件会创建一个卷，并会将配置的字段投射到文件中。VolumeSource API 对象的 metadata 字段用于配置这个卷。插件支持以下字段：

Pod 名称
Pod 命名空间
Pod 注解
Pod 标签

例 23.1. Downward API 卷插件配置

spec:
  volumes:
    - name: podinfo
      downwardAPI:: 
        items: 
          -name: "labels" 
           fieldRef:
              fieldPath: metadata.labels

spec:
  volumes:
    - name: podinfo
      downwardAPI::


        items:


          -name: "labels"


           fieldRef:
              fieldPath: metadata.labels

Copy to Clipboard

Toggle word wrap

1: 卷源的 metadata 字段配置 Downward API 卷。
2: items 字段包含要项目到卷中的字段列表。
3: 将字段项目到的文件的名称。
4: 项目的字段选择器。

例如：

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

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

Copy to Clipboard

Toggle word wrap

从 volume-pod.yaml 文件创建 pod：
```
oc create -f volume-pod.yaml
```
```
$ oc create -f volume-pod.yaml
```
Copy to Clipboard Toggle word wrap

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

$ oc logs -p dapi-volume-test-pod
cluster=downward-api-test-cluster1
rack=rack-123
zone=us-east-coast
annotation1=345
annotation2=456
kubernetes.io/config.source=api

Copy to Clipboard

Toggle word wrap

返回顶部

23.3.2. 使用卷插件

学习

尝试、购买和销售

社区

关于红帽文档

让开源更具包容性

關於紅帽

Theme

Red Hat legal and privacy links

Red Hat legal and privacy links