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Puppet Cookbook - Third Edition

Puppet Cookbook - Third Edition

By : Thomas Uphill, John Arundel
5 (2)
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Puppet Cookbook - Third Edition

Puppet Cookbook - Third Edition

5 (2)
By: Thomas Uphill, John Arundel

Overview of this book

This book is for anyone who builds and administers servers, especially in a web operations context. It requires some experience of Linux systems administration, including familiarity with the command line, file system, and text editing. No programming experience is required.
Table of Contents (12 chapters)
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11
Index

Drawing dependency graphs

Dependencies can get complicated quickly, and it's easy to end up with a circular dependency (where A depends on B, which depends on A) that will cause Puppet to complain and stop working. Fortunately, Puppet's --graph option makes it easy to generate a diagram of your resources and the dependencies between them, which can be a big help in fixing such problems.

Getting ready

Install the graphviz package to view the diagram files:

t@mylaptop ~ $ sudo puppet resource package graphviz ensure=installed
Notice: /Package[graphviz]/ensure: created
package { 'graphviz':
  ensure => '2.34.0-9.fc20',
}

How to do it...

Follow these steps to generate a dependency graph for your manifest:

  1. Create the directories for a new trifecta module:
    ubuntu@cookbook:~/puppet$ mkdir modules/trifecta
    ubuntu@cookbook:~/puppet$ mkdir modules/trifecta/manifests
    ubuntu@cookbook:~/puppet$ mkdir modules/trifecta/files
    
  2. Create the file modules/trifecta/manifests/init.pp...

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