Henry William - Docker containers build and deploy with Kubernetes, Flannel, Cockpit, and Atomic

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Build and Deploy with Kubernetes, Flannel, Cockpit, and Atomic

Christopher Negus
with William Henry

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Library of Congress Control Number: 2015948006

Copyright 2016 Pearson Education, Inc.

All rights reserved. Printed in the United States of America. This publication is protected by copyright, and permission must be obtained from the publisher prior to any prohibited reproduction, storage in a retrieval system, or transmission in any form or by any means, electronic, mechanical, photocopying, recording, or likewise. To obtain permission to use material from this work, please submit a written request to Pearson Education, Inc., Permissions Department, 200 Old Tappan Road, Old Tappan, New Jersey 07675, or you may fax your request to (201) 236-3290.

ISBN-13: 978-0-134-13656-1
ISBN-10: 0-134-13656-X
Text printed in the United States on recycled paper at RR Donnelley in Crawfordsville, Indiana.
First printing: December 2015

As always, I dedicate this book to my wife, Sheree.
Christopher Negus

Docker is a containerization technology at the center of a new wave for building, packaging, and deploying applications. It has the potential to impact every aspect of computing, from the application development process to how applications are deployed and scaled up and out across massive data centers.

Despite its great popularity, Docker is still a fairly new project, with many people still not really knowing exactly what Docker is. If you are one of those people, this book can help you take that first step, while also opening your eyes to the huge potential that containerization promises for you down the road. My goals for leading you into the world of containerization with this book can be summed up in these ways:

Hands-on learning: I often say this in my books, but I believe that the best way to learn how technology works is to get it and use it. To that end, I let you choose from among several popular Linux systems, show you how to install Docker on the one you choose, and provide working examples of using Docker for everything from running a simple container to building and managing your own container images. That learning then extends into tools and techniques for orchestrating and managing containers.

How Docker can benefit you: I explain the benefits of creating and running applications in containers, instead of installing software packages (in formats such as RPM or Deb) and running uncontained applications directly from your hard disk. Beyond running applications, I also describe how containerization can benefit software developers and system administrators.

Essential qualities of Docker: I describe how Docker uses technologies such as Linux Containers (LXC) to keep containers separate from other applications running on a host computer or selectively tap into the host system. These qualities include how Docker uses name spaces, metadata, and separate file systems to both manage and secure containerized applications.

To get started, you dont need to know anything about Docker or containerization; you can treat this book as your introduction to Docker. However, this book is also intended to offer an entry into more advanced Docker-related topics, such as orchestration and container development.

As you progress through the book, you see specific ways to run containers, investigate them, stop and start them, save them, and generally manage them. As you begin creating your own containers, I discuss techniques to help you make container images that build and run efficiently. I even step you through build files (which are called Dockerfiles) that others have created to make their own containers.

A knowledge of Linux Containers in general, or Docker containers specifically, is not needed to start using this book. That said, however, there are other technologies you will use both within your Docker containers and outside those containers to work with them. Understanding some of those technologies will make your experience with Docker that much more fruitful.