How to use NFS in Kubernetes Cluster — Configuring the NFS Server.

Kubernetes environment, by definition, should be stateless. That way, you can scale your applications, rolling upgrades, and restart crashed apps continuously without any problems.

Unfortunately, except for some serverless applications, we need to persist the data almost all the time.

Data must be retained beyond the life-cycle of a given application, pod, or even cluster in most cases. To make it possible Kubernetes users will need to utilize a persistent volume.