7 Storage in Kubernetes

 

This chapter covers

  • Creating a volume in Kubernetes
  • Persistent volume claims and storage classes
  • Using storage with applications in Kubernetes

As we have seen from previous exercises, the life of a Pod is short, and so is the life of the data that resides in that Pod. To solve this problem and retain the data that a Pod uses, we create persistent volumes (PVs). On the exam, you’ll be tested on your ability to create a PV, as well as a persistent volume claim (PVC) and a storage class. We’ll discuss each of these topics in this chapter.

The storage domain

This chapter covers the storage domain of the CKA curriculum, which consists of 10% of the questions on the exam. This domain covers the methods by which application data is used in Kubernetes, including mounting storage to Pods for use with containers. It encompasses the following competencies.

Competency
Chapter section
Implement storage classes and dynamic volume provisioning.
7.1, 7.3
Configure volume types, access modes, and reclaim policies.
7.1.1, 7.1.2, 7.1.3, 7.4
Manage persistent volumes and persistent volume claims.
7.2

7.1 Persistent volumes

7.1.1 The problem with hostPath

7.1.2 Volume modes

7.1.3 Access modes

7.1.4 Reclaim policies

7.2 Persistent volume claim

7.3 Storage class

7.3.1 Inheriting from the storage class

7.4 Nonpersistent volumes

7.5 Summary