Cron Job

第一个CronJob资源清单

apiVersion: batch/v1beta1
kind: CronJob
metadata:
  name: hello
spec:
  schedule: "* * * * *"
  jobTemplate:
    spec:
      template:
        spec:
          containers:
          - name: hello
            image: busybox:latest
            command: ["date", "+%F %T"]
          restartPolicy: Never
  successfulJobsHistoryLimit: 3
  failedJobsHistoryLimit: 1

关键参数：

• restartPolicy: 任务执行失败不重启再次尝试
• successfulJobsHistoryLimit: 成功执行的pod只保存最近3个
• failedJobsHistoryLimit:执行失败的任务Pod只保存最近1个

查看执行情况

# kubectl get cj -o wide
NAME      SCHEDULE    SUSPEND   ACTIVE    LAST SCHEDULE   AGE       CONTAINERS   IMAGES           SELECTOR
hello     * * * * *   False     1         7s              9m        hello        busybox:latest   <none>

# kubectl describe cj hello
Name:                       hello
Namespace:                  default
Labels:                     <none>
Annotations:                kubectl.kubernetes.io/last-applied-configuration={"apiVersion":"batch/v1beta1","kind":"CronJob","metadata":{"annotations":{},"name":"hello","namespace":"default"},"spec":{"failedJobsHistoryLimit":1,"j...
Schedule:                   * * * * *
Concurrency Policy:         Allow
Suspend:                    False
Starting Deadline Seconds:  <unset>
Selector:                   <unset>
Parallelism:                <unset>
Completions:                <unset>
Pod Template:
  Labels:  <none>
  Containers:
   hello:
    Image:      busybox:latest
    Port:       <none>
    Host Port:  <none>
    Command:
      date
      +%F %T
    Environment:     <none>
    Mounts:          <none>
  Volumes:           <none>
Last Schedule Time:  Wed, 05 Sep 2018 16:47:00 +0800
Active Jobs:         <none>
Events:
  Type    Reason            Age   From                Message
  ----    ------            ----  ----                -------
  Normal  SuccessfulCreate  9m    cronjob-controller  Created job hello-1536136680
  Normal  SuccessfulCreate  8m    cronjob-controller  Created job hello-1536136740
  Normal  SuccessfulCreate  7m    cronjob-controller  Created job hello-1536136800
  Normal  SawCompletedJob   7m    cronjob-controller  Saw completed job: hello-1536136800
  Normal  SuccessfulCreate  6m    cronjob-controller  Created job hello-1536136860
  Normal  SawCompletedJob   6m    cronjob-controller  Saw completed job: hello-1536136860
  Normal  SuccessfulCreate  5m    cronjob-controller  Created job hello-1536136920
  Normal  SawCompletedJob   5m    cronjob-controller  Saw completed job: hello-1536136920
  Normal  SuccessfulCreate  4m    cronjob-controller  Created job hello-1536136980
  Normal  SawCompletedJob   4m    cronjob-controller  Saw completed job: hello-1536136980
  Normal  SuccessfulDelete  4m    cronjob-controller  Deleted job hello-1536136800
  Normal  SuccessfulCreate  3m    cronjob-controller  Created job hello-1536137040
  Normal  SawCompletedJob   3m    cronjob-controller  Saw completed job: hello-1536136680
  Normal  SuccessfulDelete  3m    cronjob-controller  Deleted job hello-1536136860
  Normal  SawCompletedJob   3m    cronjob-controller  Saw completed job: hello-1536137040
  Normal  SawCompletedJob   2m    cronjob-controller  Saw completed job: hello-1536136740
  Normal  SuccessfulDelete  2m    cronjob-controller  Deleted job hello-1536136680
  Normal  SuccessfulCreate  2m    cronjob-controller  Created job hello-1536137100
  Normal  SawCompletedJob   2m    cronjob-controller  Saw completed job: hello-1536137100
  Normal  SuccessfulDelete  2m    cronjob-controller  Deleted job hello-1536136920
  Normal  SuccessfulCreate  1m    cronjob-controller  Created job hello-1536137160
  Normal  SawCompletedJob   1m    cronjob-controller  Saw completed job: hello-1536137160
  Normal  SuccessfulDelete  1m    cronjob-controller  Deleted job hello-1536136980
  Normal  SuccessfulCreate  42s   cronjob-controller  (combined from similar events): Created job hello-1536137220
  Normal  SawCompletedJob   32s   cronjob-controller  (combined from similar events): Saw completed job: hello-1536137220
  Normal  SuccessfulDelete  32s   cronjob-controller  Deleted job hello-1536137040