CKAD Storage and Persistence 3

Question 1

What is the purpose of a volumeMount entry in a container spec?

Accepted Answer

To specify the path inside the container where the volume will be accessible

Answer

A volumeMount specifies the mountPath inside a container where the referenced volume will be mounted and accessible to the application.

Question 2

How can you create an emptyDir volume backed by node RAM instead of disk?

Accepted Answer

Set emptyDir.medium: Memory

Answer

Setting emptyDir.medium to 'Memory' causes Kubernetes to mount a tmpfs (RAM-backed) filesystem, giving faster I/O at the cost of node memory.

Question 3

What does setting storageClassName: "" (empty string) in a PVC spec do?

Accepted Answer

Disables dynamic provisioning and only allows binding to pre-provisioned PVs with no StorageClass

Answer

An explicit empty storageClassName disables dynamic provisioning, causing the PVC to only bind to existing PVs that also have no StorageClass assigned.

Question 4

What prerequisite must a StorageClass satisfy before a PVC can be expanded after creation?

Accepted Answer

The StorageClass must have allowVolumeExpansion: true

Answer

To expand a PVC, the StorageClass used to provision it must have allowVolumeExpansion set to true; otherwise the resize request will be rejected.

Question 5

What is the purpose of volumeClaimTemplates in a StatefulSet?

Accepted Answer

To automatically create a unique PVC for each pod replica in the StatefulSet

Answer

volumeClaimTemplates causes Kubernetes to automatically create a separate, uniquely named PVC for each pod in the StatefulSet, giving each pod its own persistent storage.

CKAD - Certified Kubernetes Application Developer Practice Test

CKAD - Certified Kubernetes Application Developer Practice Test

CKAD Storage and Persistence 3