what are Resources in puppet

Question

Could somebody explain the concept of "resources" in puppet?

Answer 1

• 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'
  }