Book Image

The Kubernetes Workshop

By : Zachary Arnold, Sahil Dua, Wei Huang, Faisal Masood, Mélony Qin, Mohammed Abu Taleb
5 (1)
Book Image

The Kubernetes Workshop

5 (1)
By: Zachary Arnold, Sahil Dua, Wei Huang, Faisal Masood, Mélony Qin, Mohammed Abu Taleb

Overview of this book

Thanks to its extensive support for managing hundreds of containers that run cloud-native applications, Kubernetes is the most popular open source container orchestration platform that makes cluster management easy. This workshop adopts a practical approach to get you acquainted with the Kubernetes environment and its applications. Starting with an introduction to the fundamentals of Kubernetes, you’ll install and set up your Kubernetes environment. You’ll understand how to write YAML files and deploy your first simple web application container using Pod. You’ll then assign human-friendly names to Pods, explore various Kubernetes entities and functions, and discover when to use them. As you work through the chapters, this Kubernetes book will show you how you can make full-scale use of Kubernetes by applying a variety of techniques for designing components and deploying clusters. You’ll also get to grips with security policies for limiting access to certain functions inside the cluster. Toward the end of the book, you’ll get a rundown of Kubernetes advanced features for building your own controller and upgrading to a Kubernetes cluster without downtime. By the end of this workshop, you’ll be able to manage containers and run cloud-based applications efficiently using Kubernetes.
Table of Contents (20 chapters)
Preface

Kubernetes Components – Refresher

By now, you are already aware of the basic components of the Kubernetes platform. Just as a refresher, let's revisit the major components:

  • The API server is responsible for exposing RESTful Kubernetes APIs and is stateless. All users on your cluster, Kubernetes master components, kubectl clients, worker nodes, and maybe even your application all need to interact with the API server.
  • A key-value store (the etcd server) stores the objects and provides a persistent backend to the API server.
  • The scheduler and controller manager act to attain the state of the cluster and objects stored in etcd.
  • kubelet is a program that runs on every worker node and behaves like an agent to perform the work as directed by Kubernetes master components.

When we update the platform, as you will see in the later sections, we are going to utilize these components and upgrade them as separate modules.

A Word of Caution

Kubernetes...