# This class ensures ntp is up'n running and synchronizing with ntp servers.
class ntp(
  $servers = lookup('ntp::servers', undef, undef, '')
) {
  class { 'ntp::timezone': }

  case $servers {
    '': { fail("you need to define ntp::servers for ntp module") }
  }

  # the needed packages
  package { "ntp": ensure  => installed, }

  # ntp service
  service { "ntp":
    enable     => true,
    ensure     => running,
    hasrestart => true,
    require    => [ Package["ntp"], File["/etc/ntp.drift"], File["/etc/ntp.conf"] ],
  }

  # the /etc/ntp.drift file contains the latest estimate of clock frequency
  # error.
  file { "/etc/ntp.drift":
    owner  => "root",
    group  => "root",
    mode   => '0644',
    ensure => present,
  }

  # ntp configuration file
  file { "/etc/ntp.conf":
    content => template('ntp/ntp.conf.erb'),
    owner   => "root",
    group   => "root",
    mode    => '0644',
    ensure  => present,
    notify  => Service["ntp"],
  }
}