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 introduced some of the major components of a Kubernetes cluster.

Masters are where the control plane components run. Under the hood, there's a combination of several system services, including the API Server, that exposes the public REST interface. Masters make all of the deployment and scheduling decisions, and multi-master HA is important for production-grade environments.

Nodes are where user applications run. Each node runs a service called a kubelet, which registers the node with the cluster and communicates with the control plane. This includes receiving new work tasks and maintaining a reporting channel. Nodes also have a container runtime and the kube-proxy service. The container runtime, such as Docker or containerd, is responsible for all container-related operations. kube-prox is responsible for networking on the node.

We also talked about some of the major Kubernetes API objects, such as Pods, Deployments, and Services. Pods are...