Why probes keep applications healthy in Kubernetes - Quick Recap

Recall & Review

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What is a liveness probe in Kubernetes?

A liveness probe checks if an application is running. If it fails, Kubernetes restarts the app to keep it healthy.

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What does a readiness probe do?

A readiness probe tells Kubernetes if an app is ready to accept traffic. If not ready, Kubernetes stops sending requests to it.

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Why are probes important for application health?

Probes help detect problems early. They let Kubernetes fix or avoid sending traffic to unhealthy apps, improving reliability.

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How does Kubernetes react when a liveness probe fails?

Kubernetes restarts the container to try to fix the problem and keep the app running smoothly.

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What happens if a readiness probe fails?

Kubernetes stops sending new traffic to the app until it passes the readiness check again.

What is the main purpose of a liveness probe?

A To update the app automatically

B To check if the app is ready to receive traffic

C To check if the app is running and restart if not

D To monitor network speed

A liveness probe checks if the app is alive and restarts it if it is not responding.

What does a readiness probe control?

A Whether the app can receive user traffic

B The app's CPU usage

C The app's memory usage

D Whether the app should be restarted

Readiness probes tell Kubernetes if the app is ready to accept traffic.

If a readiness probe fails, what happens?

A The app is deleted

B Traffic is stopped from reaching the app

C The app is restarted immediately

D Nothing happens

Kubernetes stops sending traffic to the app until it passes the readiness check.

Why are probes useful in Kubernetes?

A They help keep apps healthy by detecting issues early

B They speed up app deployment

C They reduce app size

D They increase app storage

Probes detect problems early so Kubernetes can fix or avoid them.

Which probe causes Kubernetes to restart a container if it fails?

A Readiness probe

B Health probe

C Startup probe

D Liveness probe

Liveness probes trigger restarts when the app is not responding.

Explain how liveness and readiness probes help keep applications healthy in Kubernetes.

Think about how Kubernetes uses these checks to manage app health and traffic.

Describe what happens when a Kubernetes liveness probe fails and when a readiness probe fails.

Focus on the different reactions Kubernetes has to each probe failure.