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

In previous chapters, we created different Pods, managed their life cycle manually, and added metadata (labels or annotations) to them to help organize and identify various Pods. In this chapter, we will take a look at a few Kubernetes objects that help you manage several replica Pods declaratively.

When deploying your application in production, there are several reasons why you would want to have more than one replica of your Pods. Having more than one replica ensures that your application continues to work in cases where one or more Pods fail. In addition to handling failures, replication also allows you to balance the load across the different replicas so that one Pod is not overloaded with a lot of requests, thereby allowing you to easily serve higher traffic than what a single Pod can serve.

Kubernetes supports different controllers that you can use for replication, such as ReplicaSets, Deployments, DaemonSets, StatefulSets, and Jobs. A controller is an object...