CKA Container Fundamentals 2

Question 1

Which Linux namespace isolates the container's filesystem mount points from the host?

Accepted Answer

Mount namespace

Answer

The mount namespace isolates the set of filesystem mount points visible to a process, allowing containers to have their own filesystem hierarchy.

Question 2

What happens to container data stored in a writable layer when the container is deleted?

Accepted Answer

It is permanently lost

Answer

Data written to a container's writable layer is ephemeral and is permanently lost when the container is removed, which is why volumes are recommended for persistent data.

Question 3

Which cgroup subsystem is used to limit a container's CPU usage?

Accepted Answer

cpu and cpuacct

Answer

The cpu and cpuacct cgroup subsystems control CPU time allocation and accounting for containers, enabling CPU limits and shares.

Question 4

What is the purpose of a container entrypoint versus a command (CMD)?

Accepted Answer

ENTRYPOINT defines the executable that always runs; CMD provides default arguments that can be overridden

Answer

ENTRYPOINT defines the fixed executable to run, while CMD provides default arguments that users can override at runtime without replacing the entrypoint.

Question 5

Which OCI specification defines the format for container images?

Accepted Answer

OCI Image Specification

Answer

The OCI Image Specification defines the format for container images, including the image manifest, image index, and layer format.

(CKA) Certified Kubernetes Associate Practice Test

(CKA) Certified Kubernetes Associate Practice Test

CKA Container Fundamentals 2