【CKA模拟题】边车容器Shared-Volume的具体用法

Useful Resources: Persistent Volumes Claim , Pod to Use a PV

题干

For this question, please set this context (In exam, diff cluster name)
kubectl config use-context kubernetes-admin@kubernetes

An existing nginx pod, my-pod-cka and Persistent Volume Claim (PVC) named my-pvc-cka are available. Your task is to implement the following modifications:

• NOTE:- PVC to PV binding and my-pod-cka pods sometimes takes around 2Mins to Up & Running So Please wait
• Update the pod to include a sidecar container that uses the busybox image. Ensure that this sidecar container remains operational by including an appropriate command “tail -f /dev/null” .
• Share the shared-storage volume between the main application and the sidecar container, mounting it at the path /var/www/shared . Additionally, ensure that the sidecar container has read-only access to this shared volume.

现有的nginx pod、my-pod-cka和名为my-pvc-cka的持久卷声明(PVC)是可用的。你的任务是实现以下修改。

• 注意:PVC到PV绑定和my-pod-cka pods有时需要大约2分钟的时间来启动和运行，所以请等待
• 更新pod以包含一个使用busybox镜像的sidecar容器。通过添加适当的命令“tail -f /dev/null”来确保sidecar容器保持正常运行。
• 在主应用程序和sidecar容器之间共享共享存储卷，将它挂载到路径/var/www/shared。另外，确保sidecar容器对这个共享卷具有只读访问权限。

解题思路

1. 切换集群环境

kubectl config use-context kubernetes-admin@kubernetes

2. 按照题目的要求修改Pod的资源清单。内容如下

apiVersion: v1
kind: Pod
metadata:
  name: my-pod-cka
spec:
  containers:
    - name: nginx-container
      image: nginx:latest
      ports:
        - containerPort: 80
      volumeMounts:
        - name: shared-storage
          mountPath: /var/www/html
    - name: sidecar-container
      image: busybox:latest
      command: ["tail", "-f", "/dev/null"]
      volumeMounts:
        - name: shared-storage
          mountPath: /var/www/shared
          readOnly: true
  volumes:
    - name: shared-storage
      persistentVolumeClaim:
        claimName: my-pvc-cka