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304 — Jobs and CronJobs

Advanced

Master batch processing and scheduled tasks using Kubernetes Jobs and CronJobs for one-time and recurring workloads.

Learning Objectives

1
Create and manage Jobs for batch processing
2
Schedule recurring tasks with CronJobs
3
Configure parallelism and completions
4
Handle job failures and retries
Step 1

Create a simple Job

Run a one-time task that completes and exits.

Commands to Run

kubectl create job hello --image=busybox -- echo 'Hello from Kubernetes Job'
kubectl get jobs
kubectl get pods

What This Does

Jobs ensure pods run to completion. Unlike Deployments, completed pods aren't restarted.

Expected Outcome

Job created. Pod runs, completes, shows STATUS Completed. Job shows COMPLETIONS 1/1.

Pro Tips

  • 1
    Jobs run pods until successful completion
  • 2
    Pod exits with code 0 = success
  • 3
    Failed jobs retry based on restartPolicy
  • 4
    Completed pods kept for log inspection

Common Mistakes to Avoid

  • ⚠️Not setting backoffLimit (job retries forever on failure)
  • ⚠️Forgetting to clean up completed Jobs (accumulates resources)
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