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Mastering Puppet Second Edition

You're reading from   Mastering Puppet Second Edition Master Puppet for configuration management of your systems in an enterprise deployment

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Product type Paperback
Published in Feb 2016
Publisher
ISBN-13 9781785888106
Length 276 pages
Edition 2nd Edition
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Author (1):
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Thomas Uphill Thomas Uphill
Author Profile Icon Thomas Uphill
Thomas Uphill
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Toc

Dealing with exceptions


In a pristine environment, all your nodes with a certain role would be identical in every way and there would be no exceptions. Unfortunately, dealing with exceptions is a large part of the day-to-day business of running Puppet. It is possible to remove node level data from your code using roles and profiles together with Hiera, (roles, profiles, and modules).

Hiera can be used to achieve this separation of code from data. In Chapter 2, Organizing Your Nodes and Data, we configured hiera.yaml with roles/%{::role} in the hierarchy. The defaults for any role will be put in hieradata/roles/[rolename].yaml. The hierarchy determines the order in which files are searched for Hiera data. Our configuration is as follows:

---
:hierarchy:
  - "zones/%{::example_zone}"
  - "hosts/%{::hostname}"
  - "roles/%{::role}"
  - "%{::kernel}/%{::osfamily}/%{::lsbmajdistrelease}"
  - "is_virtual/%{::is_virtual}"
  - common

Any single host that requires an exception to the default value from...

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