Kubernetes - how to run job only once

Question

I have a job definition based on example from kubernetes website.

apiVersion: batch/v1
kind: Job
metadata:
  name: pi-with-timeout-6
spec:
  activeDeadlineSe         


        

Answer 1

If you want a one-try command runner, you probably should create bare pod, because the job will try to execute the command until it's successful or the active deadline is met.

Just create the pod from your template:

apiVersion: v1
kind: Pod
metadata:
  name: pi
spec:
  containers:
  - name: pi
    image: perl
    command: ["exit", "1"]
  restartPolicy: Never

Answer 2

By now this is possible by setting backoffLimit: 0 which tells the controller to do 0 retries. default is 6

Answer 3

Sadly there is currently no way to prevent the job controller to just respawn new pods when they fail, but the kubernetes community is working on a solution, see:

"Backoff policy and failed pod limit" https://github.com/kubernetes/community/pull/583