When you begin to include modules from the forge in your Puppet infrastructure, keeping track of which versions you installed and ensuring consistency between all your testing areas can become a bit of a problem. Luckily, the tools we will discuss in the next two sections can bring order to your system. We will first begin with librarian-puppet, which uses a special configuration file named Puppetfile to specify the source location of your various modules.

root@puppet:~# puppet resource package librarian-puppet ensure=installed provider=gem
Notice: /Package[librarian-puppet]/ensure: created
package { 'librarian-puppet':
  ensure => ['2.0.0'],
}