Wait for kubernetes job to complete on either failure/success using command line

Question

What is the best way to wait for kubernetes job to be complete? I noticed a lot of suggestions to use:

kubectl wait --for=condition=complete job/myjob
         


        

Answer 1

You can leverage the behaviour when --timeout=0.

In this scenario, the command line returns immediately with either result code 0 or 1. Here's an example:

retval_complete=1
retval_failed=1
while [[ $retval_complete -ne 0 ]] && [[ $retval_failed -ne 0 ]]; do
  sleep 5
  output=$(kubectl wait --for=condition=failed job/job-name --timeout=0 2>&1)
  retval_failed=$?
  output=$(kubectl wait --for=condition=complete job/job-name --timeout=0 2>&1)
  retval_complete=$?
done

if [ $retval_failed -eq 0 ]; then
    echo "Job failed. Please check logs."
    exit 1
fi

So when either condition=failed or condition=complete is true, execution will exit the while loop (retval_complete or retval_failed will be 0).

Next, you only need to check and act on the condition you want. In my case, I want to fail fast and stop execution when the job fails.