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Puppet 3 Cookbook

You're reading from   Puppet 3 Cookbook An essential book if you have responsibility for servers. Real-world examples and code will give you Puppet expertise, allowing more control over servers, cloud computing, and desktops. A time-saving, career-enhancing tutorial

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Product type Paperback
Published in Aug 2013
Publisher Packt
ISBN-13 9781782169765
Length 274 pages
Edition 2nd Edition
Languages
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Author (1):
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John Arundel John Arundel
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John Arundel
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Table of Contents (16) Chapters Close

Puppet 3 Cookbook
Credits
About the Author
About the Reviewers
www.PacktPub.com
Preface
1. Puppet Infrastructure 2. Puppet Language and Style FREE CHAPTER 3. Writing Better Manifests 4. Working with Files and Packages 5. Users and Virtual Resources 6. Applications 7. Servers and Cloud Infrastructure 8. External Tools and the Puppet Ecosystem 9. Monitoring, Reporting, and Troubleshooting Index

Importing configuration data with Hiera


A key principle of good programming is to separate data and code. Many Puppet manifests are full of site-specific data that makes it hard to share and re-use the manifests. Grouping all such data into structured text files and moving it outside the Puppet manifests makes it easier to maintain, as well as easier to re-use and share code with other people.

Ideally, we'd not only be able to look up configuration parameters from a data file, but also choose a different data file depending on things like the environment, the operating system, and other facts about the machine. We'd also like to be able to organize the data hierarchically so that we can override certain values with other, higher-priority values.

Puppet has a mechanism named Hiera (as in 'hierarchy') to do just this. The hiera function lets you look up configuration data from within your manifest, and Hiera takes care of returning the correct value for the current environment.

Getting ready...

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