Crobjob

2020.08.07

 

1. K8s CronJob

    https://kubernetes.io/ko/docs/concepts/workloads/controllers/cron-jobs/

 

 

2. CrobJob Test

$ cat cronjob.yaml
apiVersion: batch/v1beta1
kind: CronJob
metadata:
  name: hello
  namespace: yoosung-jeon
spec:
  schedule: "*/1 * * * *"
  jobTemplate:
    spec:
      template:
        spec:
          containers:
          - name: hello
            image: busybox
            args:
            - /bin/sh
            - -c
            - date; echo Hello from the Kubernetes cluster
          restartPolicy: OnFailure
$ k get cronjobs.batch -n yoosung-jeon
NAME    SCHEDULE      SUSPEND   ACTIVE   LAST SCHEDULE   AGE
hello   */1 * * * *   False     0        24s             16m
$ k get jobs.batch -n yoosung-jeon
NAME               COMPLETIONS   DURATION   AGE
hello-1596766620   1/1           6s         2m26s
hello-1596766680   1/1           6s         86s
hello-1596766740   1/1           7s         26s
$ k get pod -n yoosung-jeon
NAME                     READY   STATUS      RESTARTS   AGE
hello-1596766620-w8ssl   0/1     Completed   0          2m32s
hello-1596766680-h97dz   0/1     Completed   0          92s
hello-1596766740-fv2mt   0/1     Completed   0          31s
$

 

 

3. POD 실행 속도 측정

- CronJob hello는 매분 마다 실행 되며, 실행시 시간을 출력

 

- On-premise kubernetes (Dell r740)

$ k logs hello-1596766620-w8ssl -n yoosung-jeon | head -n 1
Fri Aug  7 02:17:09 UTC 2020
$ k logs hello-1596766680-h97dz -n yoosung-jeon | head -n 1
Fri Aug  7 02:18:09 UTC 2020
$ k logs hello-1596766740-fv2mt -n yoosung-jeon | head -n 1
Fri Aug  7 02:19:09 UTC 2020
$ k describe pod hello-1596766740-fv2mt -n yoosung-jeon | grep Event -A10
Events:
  Type    Reason     Age   From               Message
  ----    ------     ----  ----               -------
  Normal  Scheduled  105s  default-scheduler  Successfully assigned yoosung-jeon/hello-1596766740-fv2mt to iap07
  Normal  Pulling    104s  kubelet, iap07     Pulling image "busybox"
  Normal  Pulled     101s  kubelet, iap07     Successfully pulled image "busybox"
  Normal  Created    101s  kubelet, iap07     Created container hello
  Normal  Started    100s  kubelet, iap07     Started container hello
$

 

- Google Cloud Engine 환경 (평균: 6초)

$ k logs hello-1596767400-kpghx | head -n 1
Fri Aug  7 02:30:06 UTC 2020
$ k logs hello-1596767460-z6dbk | head -n 1
Fri Aug  7 02:31:05 UTC 2020
$ k logs hello-1596767580-4j5v5 | head -n 1
Fri Aug  7 02:33:06 UTC 2020
$