Overview:

Jobs and CronJobs are used for running finite or scheduled tasks in Kubernetes.

Jobs:

• Runs a task to completion.

Example Job YAML Manifest:

apiVersion: batch/v1
kind: Job
metadata:
  name: pi-job
spec:
  template:
    spec:
      containers:
      - name: pi
        image: perl
        command: ["perl", "-Mbignum=bpi", "-wle", "print bpi(2000)"]
      restartPolicy: Never
  backoffLimit: 4

Steps to Run a Job:

1. Apply the Job manifest:

   kubectl apply -f job.yaml

2. Monitor the Job:

   kubectl get jobs

3. Check Logs:

   kubectl logs <pod-name>

CronJobs:

• Runs tasks on a schedule.

Example CronJob YAML Manifest:

apiVersion: batch/v1
kind: CronJob
metadata:
  name: hello
spec:
  schedule: "*/1 * * * *"
  jobTemplate:
    spec:
      template:
        spec:
          containers:
          - name: hello
            image: busybox
            args:
            - /bin/sh
            - -c
            - "date; echo Hello from the Kubernetes CronJob"
          restartPolicy: OnFailure

Steps to Run a CronJob:

1. Apply the CronJob manifest:

   kubectl apply -f cronjob.yaml

2. Check Scheduled Jobs:

   kubectl get cronjob

3. Verify Logs:

   kubectl logs <pod-name>

Activity:

Create and deploy a CronJob that prints a custom message every minute. Verify its execution using logs.