what are Resources in puppet?

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Could somebody explain the concept of "resources" in puppet?
Jul 24 in Puppet by Karan
• 1,190 points
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1 answer to this question.

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  • Resources are the fundamental unit for modeling system configurations.

  • Each resource describes the desired state for some aspect of a system, like a specific service or package. When Puppet applies a catalog to the target system, it manages every resource in the catalog, ensuring the the actual state matches the desired state.

  • Resources contained in classes and defined types share the relationships of those classes and defined types. 

  • Resources are not subject to scope: a resource in any area of code can be referenced from any other area of code.

  • A resource declaration adds a resource to the catalog and tells Puppet to manage that resource's state.

  • Resource declarations

  • At minimum, every resource declaration has a resource type, a title, and a set of attributes:

  • <TYPE> { '<TITLE>': 

    <ATTRIBUTE> => <VALUE>, }

  • The resource title and attributes are called the resource body. A resource declaration can have one resource body or multiple resource bodies of the same resource type.

  • Resource declarations are expressions in the Puppet language — they always have a side effect of adding a resource to the catalog, but they also resolve to a value.The value of a resource declaration is an array of resource references, with one reference for each resource the expression describes.

  • Below is an example of a user resource declaration:

  • user { 'Sam':
     ensure     => present,
     uid        => '100',
     gid        => '100',
     shell      => '/bin/bash',
     home       => '/home/Sam'
    }

answered Jul 24 by Sirajul
• 16,920 points

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