CKAD Observability: Probes, Logging, and Debugging

Question 1

What does a Liveness Probe do when it fails?

Accepted Answer

Restarts the container

Answer

A failing liveness probe causes Kubernetes to kill and restart the container according to the pod's restartPolicy.

Question 2

What is the purpose of a Readiness Probe?

Accepted Answer

To determine if a container is ready to receive traffic

Answer

Readiness probes tell Kubernetes when a container is ready to serve requests; failing pods are removed from Service endpoints.

Question 3

Which liveness probe type sends an HTTP GET request to a specified path and port?

Accepted Answer

httpGet

Answer

The 'httpGet' probe type sends an HTTP GET request; a 2xx or 3xx status is considered success.

Question 4

What does the 'initialDelaySeconds' field in a probe configuration specify?

Accepted Answer

How long to wait after the container starts before the first probe is run

Answer

'initialDelaySeconds' delays the first probe execution, giving the container time to start up before health checks begin.

Question 5

Which command streams live logs from a pod named 'web-pod'?

Accepted Answer

kubectl logs web-pod -f

Answer

The '-f' flag (follow) streams logs in real time, similar to 'tail -f' on a log file.

CKAD - Certified Kubernetes Application Developer Practice Test