KCNA Storage Solutions 4

Question 1

Which CSI sidecar container is responsible for watching VolumeSnapshot objects and triggering snapshot creation via the CSI driver?

Accepted Answer

external-snapshotter

Answer

The external-snapshotter sidecar watches VolumeSnapshot CRDs and calls the CSI driver's CreateSnapshot RPC to physically take the snapshot.

Question 2

What is the significance of the 'claimRef' field on a PersistentVolume?

Accepted Answer

It reserves the PV for a specific PVC, preventing other PVCs from binding to it

Answer

The claimRef field on a PV creates a binding reservation to a specific PVC, which is how static provisioning ensures the correct PVC gets the pre-created PV.

Question 3

A PVC remains in 'Pending' state indefinitely. Which is the most likely cause?

Accepted Answer

No PV exists that matches the PVC's storage class, access mode, and size requirements

Answer

A PVC stays Pending when no available PV satisfies all its requirements—storage class, access mode, and requested capacity must all match.

Question 4

Which command can be used to expand the size of an existing PersistentVolumeClaim in Kubernetes?

Accepted Answer

Edit the PVC spec and increase the storage request value

Answer

To expand a PVC, you edit its spec.resources.requests.storage field to a larger value; the StorageClass must have allowVolumeExpansion: true.

Question 5

What is a key advantage of using Container Storage Interface (CSI) over in-tree volume plugins?

Accepted Answer

CSI allows storage vendors to develop and release drivers independently of the Kubernetes release cycle

Answer

CSI decouples storage driver development from Kubernetes core, so vendors can ship updates without waiting for a Kubernetes release.

(KCNA) Kubernetes and Cloud Native Associate Practice Test

(KCNA) Kubernetes and Cloud Native Associate Practice Test

KCNA Storage Solutions 4