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

Real-World Example

Although everything we've learned so far is cool and interesting, the important questions are: How does it bring value? and How does it keep businesses running and make them more agile and resilient?

Let's take a minute to run through a common real-world example – making updates to applications.

We all know that updating applications is a fact of life – bug fixes, new features, and more.

Figure 6.9 shows a simple application deployed on a Kubernetes cluster as a bunch of Pods managed by a Deployment. As part of it, we've got a Service selecting on Pods with labels that match app=biz1 and zone=prod (notice how the Pods have both of the labels listed in the label selector). The application is up and running:

Figure 6.9: Application managed by a deployment

Let's assume we need to push a new version. But we need to do it without incurring downtime.

To do this, we can add Pods running the new version...