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  • 【k8s】Volume-downwardAPI

    环境

    1. kubernetes 1.20.6
    2. Spring Boot 2.5.0-RC1

    目标

    downwardAPI 可以获取 Pod 的相关信息,并且以文件的方式存入到数据卷中。
    引入该功能的目的是为了和 k8s 的 api 解耦。

    示例

    获取 Pod 信息

    apiVersion: v1
    kind: Pod
    metadata:
      name: spring-k8s
    spec:
      containers:
        - name: spring-k8s
          image: jiangbo920827/spring-k8s:liveness
          volumeMounts:
            - mountPath: /opt/volume
              name: v1
          ports:
            - containerPort: 8080
      volumes:
        - name: v1
          downwardAPI:
            items:
              - path: name
                fieldRef:
                  fieldPath: metadata.name
    

    查看名称

    [root@master ~]# kubectl exec spring-k8s -- sh -c "cat /opt/volume/name;echo"
    spring-k8s
    [root@master ~]#
    

    获取容器信息

    apiVersion: v1
    kind: Pod
    metadata:
      name: spring-k8s
    spec:
      containers:
        - name: spring-k8s
          image: jiangbo920827/spring-k8s:liveness
          volumeMounts:
            - mountPath: /opt/volume
              name: v1
          ports:
            - containerPort: 8080
      volumes:
        - name: v1
          downwardAPI:
            items:
              - path: limit
                resourceFieldRef:
                  resource: limits.memory
                  containerName: spring-k8s
                  divisor: 1Mi
    
    [root@master ~]# kubectl exec spring-k8s -- sh -c "cat /opt/volume/limit;echo"
    2768
    

    总结

    downwardAPI 可以将 Pod 或者容器的信息写入到环境变量或者数据卷中。

    附录

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  • 原文地址:https://www.cnblogs.com/jiangbo44/p/14956957.html
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