kubernetes - 如何将容器作为 Kubernetes 作业按顺序运行？

Question

我正在尝试用 Kubernetes 作业替换我的旧作业调度程序，并想知道如何将顺序作业编写为 Kubernetes 作业。

首先，我编写了以下脚本来执行 job1和 job2按照书面顺序，但它没有按我预期的那样工作。

apiVersion: batch/v1
kind: Job
metadata:
  name: sequential
spec:
  activeDeadlineSeconds: 100
  template:
    metadata:
      name: sequential_jobs
    spec:
      containers:
      - name: job1
        image: image1
      - name: job2
        image: image2
      restartPolicy: Never

上述作业似乎运行 job1和 job2在平行下。
有什么好办法跑 job1和 job2按书面顺序？

附加。

我最近发现 https://github.com/argoproj/argo非常适合我的用例。

Answer 1

经过几次尝试，我做到了这一点，解决了基本问题(类似于 OP 发布的内容)。此配置确保 job-1之前完成 job-2开始。如 job-1失败，job-2容器未启动。我仍然需要处理重试和失败处理，但基础工作是有效的。希望这会帮助其他人:

apiVersion: v1
kind: Pod
metadata:
  name: sequential-job
spec:
  initContainers:
  - name: job-1
    image: busybox
    # runs for 15 seconds; echoes job name and timestamp
    command: ['sh', '-c', 'for i in 1 2 3; do echo "job-1 `date`" && sleep 5s; done;']
  - name: job-2
    image: busybox
    # runs for 15 seconds; echoes job name and timestamp
    command: ['sh', '-c', 'for i in 1 2 3; do echo "job-2 `date`" && sleep 5s; done;']
  # I don't really need the 'containers', but syntax requires 
  # it so, I'm using it as a place where I can report the 
  # completion status
  containers:
  - name: job-done
    image: busybox
    command: ['sh', '-c', 'echo "job-1 and job-2 completed"']
  restartPolicy: Never

更新

与上述相同的配置也适用于作业规范:

apiVersion: batch/v1
kind: Job
metadata:
  name: sequential-jobs
spec:
  template:
    metadata:
      name: sequential-job
    spec:
      initContainers:
      - name: job-1
        image: busybox
        command: ['sh', '-c', 'for i in 1 2 3; do echo "job-1 `date`" && sleep 5s; done;']
      - name: job-2
        image: busybox
        command: ['sh', '-c', 'for i in 1 2 3; do echo "job-2 `date`" && sleep 5s; done;']
      containers:
      - name: job-done
        image: busybox
        command: ['sh', '-c', 'echo "job-1 and job-2 completed"']
      restartPolicy: Never