Job:

Job會創建一個或多個pod，並在工作完成後終止(像是資料庫的合併、升級或是備份)。刪除Job將清除它創建的Pod。

job demo:

apiVersion: batch/v1
kind: Job
metadata:
  name: job-demo
spec:
  template:
    spec:
      containers:
      - name: test
        image: busybox
        command: ["echo", "hi"]
      restartPolicy: Never

部屬Job

root@master:/# kubectl apply -f job.yaml 
job.batch/job-demo created

Get Job

root@master:/# kubectl get job
NAME       COMPLETIONS   DURATION   AGE
job-demo   1/1           7s         7s

Get Pod

root@master:/# kubectl get pods
NAME                                       READY   STATUS      RESTARTS   AGE
job-demo-c7dxt                             0/1     Completed   0          14s

Get Pod log

root@master:/# kubectl logs job-demo-c7dxt  
hi

CronJob:

Linux中有crontab，而k8s的CronJob提供了類似的功能，可以定時執行Job，刪除CronJob將清除它創建的Pod。
Cronjob demo:

apiVersion: batch/v1beta1
kind: CronJob
metadata:
  name: cronjob-demo
spec:
  schedule: "*/1 * * * *" # 此為每1分鐘就執行一次
  jobTemplate:
    spec:
      template:
        spec:
          containers:
          - name: test
            image: busybox
            command: ["echo", "hi"]
          restartPolicy: Never

部屬CronJob

root@master:/# kubectl apply -f cronjob.yaml 
cronjob.batch/cronjob-demo created

Get CronJob

root@master:/# kubectl get cronjob
NAME           SCHEDULE      SUSPEND   ACTIVE   LAST SCHEDULE   AGE
cronjob-demo   */1 * * * *   False     0        22s             3m49s

Get Pod

root@master:/# kubectl get pods
NAME                                       READY   STATUS      RESTARTS   AGE
cronjob-demo-1661852520-z6nx5              0/1     Completed   0          2m25s
cronjob-demo-1661852580-jrrk8              0/1     Completed   0          85s
cronjob-demo-1661852640-mlptg              0/1     Completed   0          25s

Get Pod log

root@master:/# kubectl logs cronjob-demo-1661852520-z6nx5  
hi