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Extending Puppet - Second Edition by Jaime Soriano Pastor, Alessandro Franceschi

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Chapter 2. Managing Puppet Data with Hiera

The history of Puppet is an interesting example of how best practices have evolved with time, following new usage patterns and contributions from the community.

Once people started to write manifests with Puppet's DSL and express the desired state of their systems, they found themselves placing custom variables and parameters that expressed various resources of their infrastructures (IP addresses, hostnames, paths, URLs, names, properties, lists of objects, and so on) inside the code used to create the needed resource types.

At times, variables were used to classify and categorize nodes (systems' roles, operational environments, and so on), other times facts (such as $::operatingsystem) were used to provide ...

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