Certified Kubernetes Administrator (CKA) Practice Test

The benefit of using Persistent Volumes in Kubernetes is primarily to provide durable storage for applications. Persistent Volumes (PVs) are resources in the Kubernetes API that represent a piece of storage in the cluster which has been provisioned by an administrator or dynamically provisioned using Storage Classes. This durability means that the data stored in a Persistent Volume can outlive the individual Pods that use it, allowing for data storage that is not tied to the lifecycle of those Pods.

This approach is vital for applications that need to maintain state between restarts, such as databases or content management systems, where data integrity and availability are critical. By decoupling storage from the Pods, Kubernetes allows for greater flexibility and resilience, enabling developers to easily scale applications and manage storage independently from compute resources.

In contrast, the other options describe functionalities that are outside the scope of Persistent Volumes: setting CPU limits relates to resource management rather than storage, network access pertains to service networking and Pod communication, and security enforcement focuses on node security features rather than storage management.