init.pp for ntp class, parameterized clases

ntp_init.pp

class ntp($server = undef) {
   package { 'ntp':
     ensure => installed, 
   }
    
   file { '/etc/ntp.conf':
     content => template('ntp/ntp.conf.erb'), 
     notify => Service['ntpd'],
   }

   service { 'ntpd':
    ensure => running,
    enable => true,
    require => [ Package['ntp'], File['/etc/ntp.conf'] ],
   } 
}