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Puppet 5 Essentials Third Edition

You're reading from   Puppet 5 Essentials Third Edition A fast-paced guide to automating your infrastructure

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Product type Paperback
Published in Sep 2017
Publisher Packt
ISBN-13 9781787284715
Length 262 pages
Edition 3rd Edition
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Authors (2):
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Martin Alfke Martin Alfke
Author Profile Icon Martin Alfke
Martin Alfke
Felix Frank Felix Frank
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Felix Frank
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Table of Contents (10) Chapters Close

Preface 1. Writing Your First Manifests 2. Puppet Server and Agents FREE CHAPTER 3. A Peek into the Ruby Part of Puppet - Facts, Types, and Providers 4. Combining Resources in Classes and Defined Types 5. Combining Classes, Configuration Files, and Extensions into Modules 6. The Puppet Beginners Advanced Parts 7. New Features from Puppet 4 and 5 8. Separation of Code and Data with Hiera 9. Puppet Roles and Profiles

Using virtual resources

The next technique that we are going to discuss helps you solve conflicts in your manifests and build some elegant solutions in special situations.

Remember the uniqueness constraint that was introduced in Chapter 1, Writing Your First Manifests, any resource must be declared at most once in a manifest. There cannot be two classes or defined type instances that declare the same file, package, or any other type of resource. Each resource must have a unique type/name combination. This applies to instances of defined types as well as native resources.

This can pose issues when multiple modules need a common resource, such as an installed package, or perhaps even independent settings in the same configuration file. A component class for such resources, as introduced in Chapter 4, Combining Resources in Classes and Defined Types, will resolve basic conflicts...

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