Task weight: 4%

Use context: kubectl config use-context k8s-c1-H

Create a Pod named multi-container-playground in Namespace default with three containers, named c1 , c2 and c3 . There should be a volume attached to that Pod and mounted into every container, but the volume shouldn’t be persisted or shared with other Pods.

Container c1 should be of image nginx:1.17.6-alpine and have the name of the node where its Pod is running available as environment variable MY_NODE_NAME.

Container c2 should be of image busybox:1.31.1 and write the output of the date command every second in the shared volume into file date.log . You can use while true; do date >> /your/vol/path/date.log; sleep 1; done for this.

Container c3 should be of image busybox:1.31.1 and constantly send the content of file date.log from the shared volume to stdout. You can use tail -f /your/vol/path/date.log for this.

Check the logs of container c3 to confirm correct setup.

译文

在Namespace default中创建一个名为 multi-container-playground 的Pod，有三个容器，分别名为 c1 、c2 和 c3 。应该有一个卷连接到该Pod并挂载到每个容器中，但该卷不应该被持久化或与其他Pod共享。

容器 c1 应该是 nginx:1.17.6-alpine 镜像，并且其Pod运行的节点名称可以作为环境变量 MY_NODE_NAME 。

容器 c2 应该是 busybox:1.31.1 镜像，并在共享卷中每秒钟将 date 命令的输出写入文件 date.log 中。你可以使用 while true; do date >> /your/vol/path/date.log; sleep 1; done 来实现这一点。

容器 c3 应该是 busybox:1.31.1 镜像 ，并不断地从共享卷中发送 date.log 文件的内容到stdout。你可以使用 tail -f /your/vol/path/date.log 来实现。

检查容器 c3 的日志以确认正确的设置。

解答
kubectl config use-context k8s-c1-H

创建一个pod模板

k run multi-container-playground --image=nginx:1.17.6-alpine $do > 13.yaml

vim 13.yaml

13.yaml

# 13.yaml
apiVersion: v1
kind: Pod
metadata:
  creationTimestamp: null
  labels:
    run: multi-container-playground
  name: multi-container-playground
spec:
  containers:
  - image: nginx:1.17.6-alpine
    name: c1                                                                      # change
    resources: {}
    env:                                                                          # add
    - name: MY_NODE_NAME                                                          # add
      valueFrom:                                                                  # add
        fieldRef:                                                                 # add
          fieldPath: spec.nodeName                                                # add
    volumeMounts:                                                                 # add
    - name: vol                                                                   # add
      mountPath: /vol                                                             # add
  - image: busybox:1.31.1                                                         # add
    name: c2                                                                      # add
    command: ["sh", "-c", "while true; do date >> /vol/date.log; sleep 1; done"]  # add
    volumeMounts:                                                                 # add
    - name: vol                                                                   # add
      mountPath: /vol                                                             # add
  - image: busybox:1.31.1                                                         # add
    name: c3                                                                      # add
    command: ["sh", "-c", "tail -f /vol/date.log"]                                # add
    volumeMounts:                                                                 # add
    - name: vol                                                                   # add
      mountPath: /vol                                                             # add
  dnsPolicy: ClusterFirst
  restartPolicy: Always
  volumes:                                                                        # add
    - name: vol                                                                   # add
      emptyDir: {}                                                                # add
status: {}

创建pod

k -f 13.yaml create

检查验证C1 env , c3 logs

k get pod multi-container-playground
k exec multi-container-playground -c c1 -- env | grep MY
k logs multi-container-playground -c c3

emptyDir-0