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

Stateful Apps

We briefly introduced the concept of statefulness in Chapter 12, Your Application and HA. Stateful components of applications are a necessity to just about all information technology systems in the world. They're necessary to keep account details, records of transactions, information on HTTP requests, and a whole host of other purposes. The challenging part of running these applications in a production environment almost always has to do with either the network or the persistence mechanism. Whether it's spinning metal disks, flash storage, block storage, or some other yet-to-be-invented tool, persistence is notoriously difficult to deal with in all forms. Part of why this is difficult is because all of these forms have a non-zero probability of failure, which can become very significant once you need to have hundreds or even thousands of storage devices in a production environment. These days, many cloud providers will give assistance to customers and offer...