How to run kubernetes cronjob as a job

Create a job from a cronjob

kubectl create job --from=cronjob/my-cron test-job -n my-ns

Troubleshooting

1. Job creation fails with the following error:

error: unknown object type *v1beta1.CronJob

Install kubectl client version 1.16

curl -LO https://storage.googleapis.com/kubernetes-release/release/v1.16.0/bin/darwin/amd64/kubectl
chmod +x ./kubectl

Now, run again

./kubectl create job --from=cronjob/my-cron test-job -n my-ns

2. Job creation happens multiple times on failure, despite restartPolicy set to Never.

restartPolicy is meant for a pod, not a job. So, change backoff to zero for not allowing job to re-run.

References

• https://stackoverflow.com/questions/68902269/kubernetes-create-job-from-cronjob-not-working
• https://stackoverflow.com/questions/46610180/downgrade-kubectl-version-to-match-minikube-k8s-version
• https://kubernetes.io/docs/concepts/workloads/controllers/job/#pod-backoff-failure-policy