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

Introduction

From everything that you have learned up until this point, you know that pods and the containers that run in them are considered ephemeral. This means that they are not to be depended upon for stability as Kubernetes will intervene and move them around the cluster in order to comply with the desired state specified by the various manifests in the cluster. But there's a problem in this – what do we do with the parts of our applications that depend on the state being persisted from one interaction to the next? Without certain guarantees such as predictable naming for the pods and dependable storage operations, which we will learn about later in the chapter, such stateful components may fail if Kubernetes restarts the relevant pods or moves them around. However, before diving into the details of the aforementioned topics, let's talk briefly about stateful apps and why it's challenging to run them in a containerized environment.