Exec probe configuration in Kubernetes - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is an exec probe in Kubernetes?

An exec probe runs a command inside a container to check if the container is healthy. If the command succeeds, the container is considered healthy.

beginner

Which Kubernetes probe type uses a command to check container health?

The exec probe type uses a command executed inside the container to check its health.

intermediate

How do you define an exec probe in a Pod YAML file?

You define an exec probe under the livenessProbe or readinessProbe section with a command list under exec, like: <br>

livenessProbe:
  exec:
    command: ["/bin/check.sh"]
  initialDelaySeconds: 5
  periodSeconds: 10

beginner

What happens if the exec probe command fails?

If the exec probe command returns a non-zero exit code, Kubernetes considers the container unhealthy and may restart it depending on the probe type.

intermediate

Why use exec probes instead of HTTP or TCP probes?

Exec probes allow custom health checks by running any command inside the container, useful when HTTP or TCP checks are not applicable.

What does an exec probe do in Kubernetes?

A Runs a command inside the container to check health

B Sends an HTTP request to the container

C Checks if a TCP port is open

D Monitors container CPU usage

Exec probes run a command inside the container to determine health.

Where do you specify the exec command in a Kubernetes probe?

A Under env: variables: in container spec

B Under httpGet: path: in livenessProbe

C Under exec: command: in livenessProbe or readinessProbe

D Under tcpSocket: port: in readinessProbe

The exec command is specified under exec: command: in the probe section.

What exit code from an exec probe command means the container is healthy?

A 1

B 0

C Any non-zero code

D 255

Exit code 0 means success and healthy container.

If an exec probe fails repeatedly, what does Kubernetes do?

A Restarts the container

B Ignores the failure

C Deletes the Pod immediately

D Scales the deployment up

Kubernetes restarts the container if the liveness exec probe fails repeatedly.

Which probe type is best when you need to run a custom script inside the container?

A TCP probe

B HTTP probe

C None of the above

D Exec probe

Exec probes allow running custom scripts or commands inside the container.

Explain how to configure an exec probe in a Kubernetes Pod YAML file.

Think about where the exec command goes and timing settings.

Describe what happens when an exec probe command fails in Kubernetes.

Focus on exit codes and Kubernetes reaction.