如何在kubernetes作业中创建init容器？

Question

在 job.yaml 下面用于创建作业。未创建初始化容器。

[root@app]# kubectl version 客户端版本：version.Info{Major:"1", Minor:"15", GitVersion:"v1.15.5", GitCommit:"", GitTreeState:"clean", BuildDate:"2019 -10-15T19:16:51Z", GoVersion:"go1.12.10", 编译器:"gc", 平台:"linux/amd64"} 服务器版本: version.Info{Major:"1", Minor:"15" ，GitVersion：“v1.15.5”，GitCommit：“”，GitTreeState：“clean”，BuildDate：“2019-10-15T19：07：57Z”，GoVersion：“go1.12.10”，编译器：“gc”，平台： “linux/amd64”}

apiVersion: batch/v1
kind: Job
metadata:
  name: pi
spec:
  template:
    metadata:
      name: pi
      annotations:
        pod.beta.kubernetes.io/init-containers: '[
          {
            "name": "init-myservice",
            "image": "busybox",
            "command": ["sh", "-c", "until nslookup myservice; do echo waiting for myservice; sleep 2; done;"]
          },
          {
            "name": "init-mydb",
            "image": "busybox",
            "command": ["sh", "-c", "until nslookup mydb; do echo waiting for mydb; sleep 2; done;"]
          }
        ]'
    spec:
      containers:
      - name: pi
        image: perl
        command: ["perl", "-Mbignum=bpi", "-wle", "print bpi(2000)"]
      restartPolicy: Never

Answer 1

InitContainers 在 Pod 规范中设置。不是元数据。Pod 规范对于作业、部署或创建 Pod 的任何内容都是相同的。

apiVersion: batch/v1
kind: Job
metadata:
  name: pi
spec:
  template:
    metadata:
      name: pi
    spec:
      containers:
      - name: pi
        image: perl
        command: ["perl", "-Mbignum=bpi", "-wle", "print bpi(2000)"]
      initContainers:
      - name: init-myservice
        image: busybox:1.28
        command: ["sh", "-c", "until nslookup myservice; do echo waiting for myservice; sleep 2; done;"]
      - name: init-mydb
        image: busybox:1.28
        command: ["sh", "-c", "until nslookup mydb; do echo waiting for mydb; sleep 2; done;"]
      restartPolicy: Never