Using Docker
by Adrian Mouat
Copyright 2016 Adrian Mouat. All rights reserved.
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978-1-491-91576-9
[LSI]
Dedication
To those who try, whether they fail or succeed.
Preface
Containers are a lightweight and portable store for an application and its dependencies .
Written down by itself, this sounds dry and boring. But the process improvementsmade possible by containers are anything but; used correctly, containers can begame-changing. So persuasive is the lure of the architectures and workflows madepossible by containers that it feels like every major IT company has gone in a year fromnever having heard of Docker or containers to actively investigating and usingthem.
The rise of Docker has been astonishing. I dont remember anytechnology that has had such a fast and profound effect on the IT industry. Thisbook is my attempt to help you understand why containers are so important,what you stand to gain from adopting containerization and, most importantly,how to go about it.
Who Should Read This Book
This book tries to take a holistic approach to Docker, explaining the reasons forusing Docker and showing how to use it and how to integrate it into asoftware-development workflow. The book covers the entire software lifecycle,from development through to production and maintenance.
I have tried to avoid assuming too much of the reader beyond a basic knowledgeof Linux and software development in general. The intended readership isprimarily software developers, operations engineers, and system administrators(particularly those keen to develop a DevOps approach), but technically informedmanagers and enthusiasts should also be able to get something out of this book.
Why I Wrote This Book
I was in the fortunate position to learn about and use Docker while it wasstill in the early stages of its meteoric rise. When the opportunity to writethis book appeared, I leapt at it with both hands. If my scribblings can helpsome of you to understand and make the most of the containerization movement, Iwill have achieved more than I have in years of developing software.
I truly hope that you enjoy reading this book and that it helps you on the pathto using Docker in your organization.
Navigating This Book
This book is organized roughly as follows:
starts by explaining what containers are and why you should be interested in them, before going into a tutorial chapter showing the basics of Docker. It ends with a large chapter explaining thefundamental concepts and technology in Docker, including an overview of thevarious Docker commands.
explains how to use Docker in a software-development lifecycle. It starts by showing how to set up a development environment,before building a simple web application that is used as an ongoing examplethrough the rest of Part II. The chapter covers development, testing,and integration, as well as how to deploy containers and how to effectivelymonitor and log a production system.
goes into advanced details and the tools and techniques needed to run multihost clusters of Docker containers safely andreliably. If you are already using Docker and need to understand how to scale upor solve networking and security issues, this is for you.
Conventions Used in This Book
The following typographical conventions are used in this book:
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Used for program listings, as well as within paragraphs to refer to program elements such as variable or function names, databases, data types, environment variables, statements, and keywords.
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Using Code Examples
Supplemental material (code examples, exercises, etc.) is available for download at https://github.com/using-docker/.
This book is here to help you get your job done. In general, if example code is offered with this book, you may use it in your programs and documentation. You do not need to contact us for permission unless youre reproducing a significant portion of the code. For example, writing a program that uses several chunks of code from this book does not require permission. Selling or distributing a CD-ROM of examples from OReilly books does require permission. Answering a question by citing this book and quoting example code does not require permission. Incorporating a significant amount of example code from this book into your products documentation does require permission.
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