Example Puppet Class to create PE Groups automatically from Role Classes

create_groups.pp

class node_manager::create_groups {


  $environments = split(fetch_environments(), ',')

  $environments.each | $env | {

    $classes = split(fetch_resource_types("production", "^role::"), ',')

    $classes.each | $class | {

      $full_name = $class
      $short_name = regsubst($class, 'role::', '')

      $group_name = regsubst($short_name, '_', ' ', 'G')
      $cap_group_name = join(capitalize(split($group_name, ' ')), ' ')

      node_group { "$env-$cap_group_name":
        ensure               => 'present',
        classes              => {"${full_name}" => {}},
        environment          => 'production',
        override_environment => false,
        parent               => 'All Nodes',
        rule                 => ['and', ['=', ['fact', 'role'], "${short_name}"]],
      }

    }
  }
}