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Puppet 4 Essentials, Second Edition

You're reading from   Puppet 4 Essentials, Second Edition Acquire skills to manage your IT infrastructure effectively with Puppet

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Product type Paperback
Published in Dec 2015
Publisher
ISBN-13 9781785881107
Length 246 pages
Edition 2nd Edition
Tools
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Authors (2):
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Felix Frank Felix Frank
Author Profile Icon Felix Frank
Felix Frank
Martin Alfke Martin Alfke
Author Profile Icon Martin Alfke
Martin Alfke
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Table of Contents (10) Chapters Close

Preface 1. Writing Your First Manifests FREE CHAPTER 2. The Master and Its Agents 3. A Peek under the Hood – Facts, Types, and Providers 4. Modularizing Manifests with Classes and Defined Types 5. Extending Your Puppet Infrastructure with Modules 6. Leveraging the Full Toolset of the Language 7. New Features from Puppet 4 8. Separating Data from Code Using Hiera Index

Debugging Hiera lookups


As you can see from the preceding example, the data that contributes to the complete configuration of any module can be rather dispersed throughout the set of your data sources. It can be challenging to determine where the respective values are retrieved from for any given agent node. It can be frustrating to trace data sources to find out why a change at some level will not take effect for some of your agents.

To help make the process more transparent, Hiera comes with a command-line tool called hiera. Invoking it is simple:

root@puppetmaster # hiera -c /etc/puppetlabs/code/hiera.yaml demo::atoms

It retrieves a given key using the specified configuration from hiera.yaml. Make sure that you use the same Hiera configuration as Puppet.

Of course, this can only work sensibly if Hiera selects the same data sources as the compiler, which uses fact values to form a concrete hierarchy. These required facts can be given right on the command line as the final parameters:

root...
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