Listing 1. modules/nagios/manifests/init.pp

# This class will be used by the nagios server
class nagios {

  service { nagios:
    ensure => running,
    enable => true,
  }

  # Be sure to include this directory in your nagios.cfg
  # with the cfg_dir directive

  file { resource-d:
    path => '/etc/nagios/resource.d',
    ensure => directory,
    owner => 'nagios',
  }

  # Collect the nagios_host resources
  Nagios_host <<||>> {
    require => File[resource-d],
    notify => Service[nagios],
  }
}