Kubectl get pods

See the following command lines:

NAME                       READY     STATUS              RESTARTS   AGE
stretch-1482165720-qm5bj   0/1       ImagePullBackOff    0          1m
stretch-1482165780-bkqjd   0/1       ContainerCreating   0          6s
Note that each invocation of a cron job launches a new job object with a new pod:
> kubectl get jobs
NAME                 DESIRED   SUCCESSFUL   AGE
stretch-1482165300   1         1            11m
stretch-1482165360   1         1            10m
stretch-1482165420   1         1            9m
stretch-1482165480   1         1            8m

When a cron job invocation completes, its pod gets into a Completed state and will not be visible without the –show-all or -a flags:

> Kubectl get pods --show-all
NAME                       READY     STATUS      RESTARTS   AGE
stretch-1482165300-g5ps6   0/1       Completed   0          15m
stretch-1482165360-cln08   0/1       Completed   0          14m
stretch-1482165420-n8nzd   0/1       Completed   0          13m
stretch-1482165480-0jq31   0/1       Completed   0          12m

As usual, you can check the output of the pod of a completed cron job using the logs command:

> kubectl logs stretch-1482165300-g5ps6
[2016-12-19 16:35:15.325283] Stretch

You must also clean up all the individual jobs, otherwise they will stick around forever. Just deleting the cron job is not enough; it will just stop scheduling more jobs.

You can use the designated label (name=stretch in this case) to locate all the job objects launched by the cron job.

In summary, the cleanup of a cron job involves the following:

  • Deleting the cron job
  • Deleting all job objects that match the label
    > kubectl delete cronjobs/stretch 
cronjob "stretch" deleted

> kubectl delete jobs -l name=stretch
job "stretch-1482165300" deleted
job "stretch-1482165360" deleted
job "stretch-1482165420" deleted
job "stretch-1482165480" deleted

You can also suspend a cron job so it doesn't create more jobs.

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