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

Hands-On with Pods

It's time to see Pods in action.

For the examples in the rest of this chapter, we'll use the three-node cluster shown in Figure 4.8:

Figure 4.8: Three-node cluster

It doesn't matter where this cluster is or how it was deployed. All that matters is that you have three Linux hosts configured into a Kubernetes cluster with at least one master and two nodes. You'll also need kubectl installed and configured to talk to the cluster.

If you do not have a cluster but would like to follow along, go to http://play-with-k8s.com and build a quick cluster. It's free and easy.

Following the Kubernetes mantra of composable infrastructure, we define Pods in manifest files, POST these to the API server, and let the scheduler instantiate them on the cluster.

Pod Manifest Files

For the examples in this chapter, we're going to use the following Pod manifest. It's available in the book's GitHub repository...