Book Image

The Kubernetes Book

By : Nigel Poulton, Pushkar Joglekar
Book Image

The Kubernetes Book

By: Nigel Poulton, Pushkar Joglekar

Overview of this book

Kubernetes is the leading orchestrator of cloud-native apps. With knowledge of how to work with Kubernetes, you can easily deploy and manage applications on the cloud or in your on-premises data center. The book begins by introducing you to Kubernetes and showing you how to install it. You’ll learn how to use Kubernetes Services and bring stable and reliable networking to apps that are deployed on Kubernetes. You'll delve deep into the powerful storage subsystem of Kubernetes and learn how to leverage the variety of external storage backends in your applications. As the book progresses, it shows you how to use features such as DaemonSets, Helm, and RBAC to enhance your Kubernetes applications. You'll explore the six categories of identifying vulnerabilities and look at a few ways to prevent and mitigate them. You'll also look at ways to secure the software delivery pipeline by discussing some image-related best practices. The book ends by sharing with you some resources that’ll help take your Kubernetes knowledge to the next level. By the end of the book, you’ll have the confidence and skills to leverage all the features of Kubernetes to develop scalable applications.
Table of Contents (23 chapters)
Free Chapter
1
Chapter 1
3
Chapter 2
5
Chapter 3
7
Chapter 4
9
Chapter 5
11
Chapter 6
13
Chapter 7
15
Chapter 8
17
Chapter 9
19
Chapter 10
21
Chapter 11

Summary

In this chapter, we've learned that Kubernetes has a powerful storage subsystem that allows it to leverage storage from a wide variety of external storage backends.

Each backend requires a plugin so that its storage assets can be used on the cluster, and the preferred type of plugin is a CSI plugin. Once a plugin is enabled, Persistent Volumes (PV) are used to represent external storage resources within the cluster, and Persistent Volume Claims (PVC) are used to give Pods access to PV storage.

Storage Classes take things to the next level by allowing applications to dynamically request storage. You create a Storage Class object that references a class, or tier, of storage from a storage backend. Once created, the Storage Class watches the API server for new PVCs that reference it by name. When a matching PVC arrives, the SC dynamically creates the storage and makes it available as a PV that can be mounted as a volume into a Pod (container).