CKA考试题：[init container]

考试题：

向lumpy—koala添加一个init容器(已在/opt/kucc00100/pod-spec-kucc00100.yaml中定义)

init容器应该创建一个名为/workdir/calm.txt的空文件

如果/workdir/calm.txt没有检测到，Pod应该退出

一旦使用init容器定义更新了 spec文件，就应该创建Pod 

解答：

(1)已有的yaml文件最后加上

initContainers:
  - name: busybox
    image: busybox
    command: ["/bin/sh", "-c", "touch /workdir/calm.txt"]

全貌如下：

apiVersion: v1
kind: Pod
metadata:
  name: kumpy-koala
spec:
  volumes:
  - name: workdir
    emptyDir: {}
  containers:
  - name: checker
    image: alpine
    command: ["/bin/sh", "-c", "if [ -f /workdir/calm.txt ];then sleep 100000;else exit 1;fi"]
    volumeMounts:
     - name: workdir
       mountPath: /workdir
  initContainers:
  - name: busybox
    image: busybox
    command: ['/bin/sh', '-c', 'touch /workdir/calm.txt']
    volumeMounts:
    - name: workdir
      mountPath: /workdir

(2)更改完成后，创建该pod

kubectl apply -f /opt/kucc00100/pod-spec-KUCC00100.yaml