It’s taken me nearly a year, but I finally figured out one of the questions that stumped me in my CKAD (writeup: https://blenderfox.com/2019/12/01/ckad-writeup/)

In the exam, the question was to terminate a cronjob if it lasts longer than 17 seconds. There’s a startup deadline but not a duration deadline. It could be implemented within the command of the application itself, or by specifying to replace any previous running version of the jobs.

Well, I finally had that situation recently at work and wanted to terminate a cronjob if it was active more than 5 minutes, since the job shouldn’t take that long. Finally found out that the answer was not in the CronJob documentation, but in the Job documentation.

CronJobs spawn a Job resource, and within the specification, you can include spec.activeDeadlineSeconds. This will terminate the job pod at that time and will consider the job as failed.