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Extending Puppet by Alessandro Franceschi

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Chapter 2. 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 and express the desired state of their systems with Puppet's DSL, 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); at other times, facts (such as $::operatingsystem) were used to provide resources with the ...

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