Joseph Hall - Extending SaltStack
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Copyright 2016 Packt Publishing
All rights reserved. No part of this book may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, without the prior written permission of the publisher, except in the case of brief quotations embedded in critical articles or reviews.
Every effort has been made in the preparation of this book to ensure the accuracy of the information presented. However, the information contained in this book is sold without warranty, either express or implied. Neither the author, nor Packt Publishing, and its dealers and distributors will be held liable for any damages caused or alleged to be caused directly or indirectly by this book.
Packt Publishing has endeavored to provide trademark information about all of the companies and products mentioned in this book by the appropriate use of capitals. However, Packt Publishing cannot guarantee the accuracy of this information.
First published: March 2016
Production reference: 1160316
Published by Packt Publishing Ltd.
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Birmingham B3 2PB, UK.
ISBN 978-1-78588-861-8
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Author
Joseph Hall
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C. R. Oldham
Mike Place
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Regardless of your current experience with Salt, you will find this book a necessary addition to unlock the full potential and capabilities of Salt to manage your infrastructure. Salt has a very flexible and modular architecture, and you will no doubt get very far down the path of fully automating your environment with the out-of-the-box Salt setup. However, we all have those custom unique quirks to our environments, or legacy systems, which require special treatment. Extending SaltStack will arm you with all of the information you need to get the most out of Salt to manage those hard-to-reach places of your environment to obtain full automation.
As the author of one of Salt's cloud modules, I can only say that I am envious of your position! I wish that this book had been available to provide the basics of module development when I was getting started. You'll find this book does a great job of covering all the basics of extending Salt, whereas also providing the detailed depth to really understand how your modules plug in with the rest of Salt.
Joseph Hall was the first engineer working at SaltStack apart from the Founder, Thomas Hatch. He has worked on all components of Salt and built much of the foundation that makes the tool so easy to extend. I have positive feelings that you'll find this book concise, easy to follow, and an outstanding resource to learn how to take full advantage of Salt. Go forth and automate!
Eric Johnson
Author of SaltStack's Google Compute Engine cloud module
Joseph Hall has been working with SaltStack for a very long time. His first commit was on March 14, 2011, making him the second contributor to the Salt codebase. At the time his Python skills weren't very good, but writing Salt modules made them better. He has written a number of Salt modules and is planning to write many more. He has also written Mastering SaltStack , Packt Publishing .
I would like to thank my beautiful and wonderful wife Nat for putting up with me for two books and helping me keep my sanity. I would like to thank Merwyn D'Souza, Reshma Raman, and everyone else that I've worked with at Packt for just being so awesome. I would also like to thank Colton Meyers for introducing me to Packt, Mike Place and C. R. Oldham for providing technical review for this book, and Tom Hatch for creating this amazing piece of software.
C. R. Oldham is a platform engineer and team lead for the integrations team at SaltStack. A veteran of the technology industry, he has had his hands in almost every aspect of computing in his 20+ years' career, including software development, engineering management, systems administration, and open source. He resides in Utah with his wife, three kids, two cats, a veiled chameleon, and an albino corn snake. You can find his occasional writings at http://ncbt.org.
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This book is dedicated to Nat. "You flicker And you're beautiful You glow inside my head You hold me hypnotized I'm mesmerized" |
| -- The Cure, The Caterpillar |
You hold in your hands (or in your e-reader) the first book dedicated to writing code to be used with the SaltStack framework of tools.
, Starting with the Basics , starts with a discussion of the two core principles that this book focuses on: how Salt uses Python and how the Loader system works. These form the foundation of extending Salt.
, Writing Execution Modules , explains that the heavy lifting in most of Salt is performed by execution modules, which are often wrapped by other modules. A solid understanding of execution modules will also be key to understanding how other module types work.
, Extending Salt Configuration , explains that the ability to dynamically manage configuration can make some modules far more useful. Some modules won't even work without dynamic configuration. Here, we explore different ways to provide that.
, Wrapping States Around Modules , supports the fact that execution modules make things work, but state modules make that work persist. In this chapter, you will see how to manage execution modules using state modules.
, Rendering Data , shows that the renderer system allows you to add your own templating systems, increasing the power of states. Jinja and YAML are all well and good, but sometimes, you need something more.
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