Summary

In this chapter, we took a deep look into storage in Kubernetes. We've looked at the generic conceptual model based on volumes, claims, and storage classes, as well as the implementation of volume plugins. Kubernetes eventually maps all storage systems into mounted filesystems in containers or devices of raw block storage. This straightforward model allows administrators to configure and hook up any storage system from localhost directories through cloud-based shared storage all the way to enterprise storage systems. The transition of storage provisioners from in-tree to CSI-based out-of-tree drivers bodes well for the storage ecosystem. You should now have a clear understanding of how storage is modeled and implemented in Kubernetes and be able to make intelligent choices regarding how to implement storage in your Kubernetes cluster.

In Chapter 7, Running Stateful Applications with Kubernetes, we'll see how Kubernetes can raise the level of abstraction...