Using hiera as node classifier.

hieradata.yaml

:hierarchy:
  - Nodes/%{fqdn}
  - Domain/%{domain}
  - %{environment}
  - common

:backends:
  - yaml
  - puppet

:yaml:
  :datadir: '/etc/puppet/hieradata'

:puppet:
  :datasource: data

hieradata_common.yaml

classes:
  - puppet::agent
  - ntp
  - resolv
  #- motd

manifests_site.pp

# global defaults

# backup file changes to the puppet server
# Only for complete files managed by puppet!
filebucket { 'puppet':
    server => puppet
}

File {
    backup  => 'puppet',
}

# PATH setting
Exec {
    path => '/usr/bin:/usr/sbin/:/bin:/sbin'
}

# Stages
stage { 'pre': before => Stage[main] }

stage { 'post': require => Stage[main] }

#class {
#    "installsource::repo": stage   => pre
#    "nagios::nrpe::checks": stage   => post
#}


# Default stuff for ALL nodes
node default
{
    include common
}

modules_common_manifests_init.pp

class common {
  
  $classes = hiera( 'classes', [] )

  class { $classes: }

}