Why persistent storage matters in Kubernetes - Quick Recap

Recall & Review

beginner

What is persistent storage in Kubernetes?

Persistent storage in Kubernetes is a way to save data beyond the life of a single container or pod, so data is not lost when pods restart or move.

beginner

Why do pods need persistent storage?

Pods need persistent storage to keep important data safe even if the pod crashes, restarts, or is deleted. Without it, data would be lost.

intermediate

What is a PersistentVolume (PV) in Kubernetes?

A PersistentVolume (PV) is a piece of storage in the cluster that has been provisioned by an administrator or dynamically created, ready to be used by pods.

intermediate

How does a PersistentVolumeClaim (PVC) work?

A PersistentVolumeClaim (PVC) is a request for storage by a pod. It asks for a certain size and access mode, and Kubernetes matches it to a suitable PersistentVolume.

beginner

What happens if you don’t use persistent storage for stateful apps in Kubernetes?

If you don’t use persistent storage, any data created by the app will be lost when pods restart or move, causing loss of user data or app state.

What does persistent storage in Kubernetes help with?

A Making pods run faster

B Keeping data safe when pods restart or move

C Increasing CPU power for pods

D Automatically scaling pods

Persistent storage keeps data safe even if pods restart or move, preventing data loss.

Which Kubernetes object represents a storage resource in the cluster?

A ConfigMap

B Pod

C Service

D PersistentVolume (PV)

PersistentVolume (PV) represents a storage resource available in the cluster.

What does a PersistentVolumeClaim (PVC) do?

A Requests storage for a pod

B Deletes storage

C Creates a new pod

D Monitors pod health

A PVC requests storage from available PersistentVolumes for a pod to use.

What happens to data if a pod without persistent storage restarts?

A Data is saved automatically

B Pod restarts faster

C Data is lost

D Pod scales up

Without persistent storage, data inside the pod is lost when it restarts.

Why is persistent storage important for stateful applications?

A To keep user data safe across pod restarts

B To speed up network traffic

C To reduce memory usage

D To increase CPU cores

Stateful apps need persistent storage to keep user data safe even if pods restart.

Explain why persistent storage is important in Kubernetes and how it helps pods.

Think about what happens to data when pods restart or move.

Describe the roles of PersistentVolume and PersistentVolumeClaim in Kubernetes storage.

One is the storage itself, the other asks for storage.