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

Introduction

In Chapter 4, How to Communicate with Kubernetes (API Server), we learned how Kubernetes exposes its Application Programming Interface (API) to interact with the Kubernetes platform. You also studied how to use kubectl to create and manage various Kubernetes objects. The kubectl tool is simply a client to the Kubernetes API server. Kubernetes master nodes host the API server through which anyone can communicate with the cluster. The API server provides a way to communicate with Kubernetes for not only external actors but also all internal components, such as the kubelet running on a worker node.

The API server is the central access point to our cluster. If we want to make sure that our organization's default set of best practices and policies are enforced, there is no better place to check for and apply them than at the API server. Kubernetes provides this exact capability via admission controllers.

Let's take a moment to understand why admission controllers...