Kubernetes and Cloud Native Associate (KCNA) — Question 53

A CronJob is scheduled to run by a user every one hour. What happens in the cluster when it's time for this CronJob to run?

Answer options

• A. Kubelet watches API Server for CronJob objects. When it's time for a Job to run, it runs the Pod directly.
• B. Kube-scheduler watches API Server for CronJob objects, and this is why it's called kube-scheduler.
• C. CronJob controller component creates a Pod and waits until it finishes to run.
• D. CronJob controller component creates a Job. Then the Job controller creates a Pod and waits until it finishes to run.

Correct answer: D

Explanation

The correct answer is D because the CronJob controller creates a Job, and then the Job controller is responsible for creating the Pod that executes the task. Options A and B are incorrect as they misattribute the actions to the Kubelet and Kube-scheduler, respectively, while option C incorrectly states that the CronJob controller creates a Pod directly without involving a Job.