Book Image

The Kubernetes Workshop

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

The Kubernetes Workshop

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

Why We Need Custom Resources?

As stated earlier, CRs provide a way through which we can extend the Kubernetes platform to provide functionalities that are specific to certain use cases. Here are a few use cases where you will encounter the use of CRs.

Example Use Case 1

Consider a use case in which you want to automate the provisioning of a business application or a database onto the Kubernetes cluster automatically. Abstracting away the technical details, such as configuring and deploying the application, allows teams to manage them without having an in-depth knowledge of Kubernetes. For example, you can create a CR to abstract the creation of a database. Thus, users can create a database Pod by just defining the name and size of the database in a CRD, and the controller will provision the rest.

Example Use Case 2

Consider a scenario where you have self-serving teams. Your Kubernetes platform is used by multiple teams and you would like the teams to provision namespaces...