Create Cronjobs in Kubernetes

 Question : 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 nautilus.

Set schedule to */2 * * * *.

Container name should be cron-nautilus.

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

Please Note:-  Perform the below commands based on your question server,  user name & other details that might differ. So please read the task carefully before executing it. All the Best 👍

Solution:  

1.  Kindly check the existing pod & cronjob

thor@jump_host /$ kubectl get pod No resources found in default namespace. thor@jump_host /$ thor@jump_host /$ kubectl get cronjob No resources found in default namespace. thor@jump_host /$

2.  Create a YAML  file with all the parameters,  Kindly do the changes as per task

you can copy from GitLab    https://gitlab.com/nb-tech-support/devops.git

    ( Refer Below Video for more clarity )

thor@jump_host /$ vi /tmp/cron.yml thor@jump_host /$ thor@jump_host /$ cat /tmp/cron.yml apiVersion: batch/v1beta1 kind: CronJob metadata:   name: nautilus spec:   schedule: "*/2 * * * *"   jobTemplate:     spec:       template:         spec:           containers:             - name: cron-nautilus               image: nginx:latest               command:                 - /bin/sh                 - -c                 - echo Welcome to xfusioncorp           restartPolicy: OnFailure thor@jump_host /$

3. Run the below command to create a pod 

thor@jump_host /$ kubectl create -f /tmp/cron.yml cronjob.batch/nautilus created thor@jump_host /$

4.  Wait for the pod to get completed status & check Cronjob

thor@jump_host /$ kubectl get cronjob NAME       SCHEDULE      SUSPEND   ACTIVE   LAST SCHEDULE   AGE nautilus   */2 * * * *   False     0        <none>          8s thor@jump_host /$ thor@jump_host /$ kubectl get pod NAME                        READY   STATUS      RESTARTS   AGE nautilus-1627054320-f6xl6   0/1     Completed   0          40s thor@jump_host /$

5.  Validate the task by running the below command 

thor@jump_host /$ kubectl logs nautilus-1627054320-f6xl6 Welcome to xfusioncorp thor@jump_host /$

6.  Click on Finish & Confirm to complete the task successfully

Happy Learning!!!!

 Apart from this if you need more clarity,  I have made a  tutorial video on this, 

please go through and share your comments. Like and share the knowledge