Create Cronjobs in Kubernetes

Task :

There are some jobs/tasks that need to be run regularly on different schedules. Currently the Nautilus DevOps team is working on developing some scripts that will be executed on different schedules, but for the time being the team is creating some cron jobs in Kubernetes cluster with some dummy commands (which will be replaced by original scripts later). Create a cronjob as per details given below:

Create a cronjob named datacenter.

Set schedule to */10 * * * *.

Container name should be cron-datacenter.

Use httpd image with latest tag only and remember to mention tag i.e httpd:latest.

Run a dummy command echo Welcome to xfusioncorp.

Ensure restart policy is OnFailure.

Note: The kubectl utility on jump_host has been configured to work with the kubernetes cluster.

Solution :

thor@jump_host /$ cd /home/thor/
thor@jump_host ~$ vi cron.yml
apiVersion: batch/v1beta1
kind: CronJob
metadata:
  name: datacenter
spec:
  schedule: "*/10 * * * *"
  jobTemplate:
    spec:
      template:
        spec:
          containers:
            - name: cron-datacenter
              image: httpd:latest
              command:
                - /bin/sh
                - -c
                - echo Welcome to xfusioncorp
          restartPolicy: OnFailure

thor@jump_host ~$ kubectl apply -f cron.yml 
cronjob.batch/datacenter created
thor@jump_host ~$ kubectl get cronjob
NAME SCHEDULE SUSPEND ACTIVE LAST SCHEDULE AGE
datacenter */10 * * * * False 0 <none> 21s

wait for 10 minutes

thor@jump_host ~$ kubectl get pod
NAME READY STATUS RESTARTS AGE
datacenter-1619272200-pvr86 0/1 Completed 0 4m47s