Readiness probe concept in Kubernetes - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is a readiness probe in Kubernetes?

A readiness probe checks if a container is ready to accept traffic. It helps Kubernetes know when to send requests to the container.

beginner

How does Kubernetes use readiness probes in managing pods?

Kubernetes uses readiness probes to decide if a pod should receive traffic. If the probe fails, the pod is removed from the service endpoints until it passes again.

intermediate

Name three types of readiness probes supported by Kubernetes.

Kubernetes supports HTTP GET, TCP socket, and command execution probes for readiness checks.

intermediate

What happens if a readiness probe fails continuously?

If a readiness probe fails continuously, Kubernetes stops sending traffic to the pod but does not restart it. The pod stays running but is marked as not ready.

beginner

Why is a readiness probe different from a liveness probe?

A readiness probe checks if a pod can receive traffic, while a liveness probe checks if a pod is alive and should be restarted if it fails.

What does a readiness probe in Kubernetes do?

A Checks if a container is ready to accept traffic

B Restarts a container if it crashes

C Monitors CPU usage of a container

D Scales the number of pods automatically

A readiness probe checks if a container is ready to accept traffic so Kubernetes knows when to route requests.

Which of these is NOT a type of readiness probe?

A HTTP GET

B Memory usage check

C Command execution

D TCP socket

Memory usage check is not a readiness probe type. Kubernetes supports HTTP GET, TCP socket, and command execution probes.

If a readiness probe fails, what does Kubernetes do?

A Deletes the pod

B Restarts the pod immediately

C Stops sending traffic to the pod

D Scales up the pod count

Kubernetes stops sending traffic to the pod but keeps it running if the readiness probe fails.

How is a readiness probe different from a liveness probe?

A Readiness probe restarts pods, liveness probe does not

B They are the same

C Liveness probe checks traffic readiness, readiness probe checks CPU

D Readiness probe checks if pod can receive traffic, liveness probe checks if pod is alive

Readiness probes check if a pod can receive traffic; liveness probes check if a pod is alive and should be restarted.

Which Kubernetes object uses readiness probes to manage traffic routing?

A Service

B Pod

C ConfigMap

D Namespace

Services use readiness probe results to decide which pods receive traffic.

Explain what a readiness probe is and why it is important in Kubernetes.

Think about how Kubernetes decides if a pod can handle requests.

Describe the types of readiness probes and how Kubernetes reacts when a readiness probe fails.

Consider the methods Kubernetes uses to check pod readiness and the impact of failure.