Why isn't the variable available?

Фон

I would like to apply this idea of having a common class that includes all the specific info about my setup.

So I have created /etc/puppet/modules/common/manifests/init.pp с

class common { include common::data }
class common::data { $ntpServerList = [ 'ntp51.ex.com','ntp3.ex.com' ] }

and installed this ntp module and have created a node like so

node testip {
  include myconfig::ntpp
}

проблема

/etc/puppet/modules/myconfig/manifests/init.pp содержит

class myconfig::ntpp {
  include common
  class {'ntp':
      server_list => $ntpServerList
#          server_list => ['ntp.ex.com']    # this works
  }
}

and I would have expected that $ntpServerList would be available, but it isn't. Ошибка

Error: Could not retrieve catalog from remote server: Error 400 on SERVER: Failed to parse template ntp/ntp.conf.erb:
  Filepath: /usr/lib/ruby/site_ruby/1.8/puppet/parser/templatewrapper.rb
  Line: 64
  Detail: Could not find value for 'server_list' at /etc/puppet/modules/ntp/templates/ntp.conf.erb:25
 at /etc/puppet/modules/ntp/manifests/init.pp:183 on node testip

Вопрос

Can anyone figure out what is wrong with my myconfig::ntpp учебный класс?