set_dns()
{
  echo "search ${HOST_NAME#*.}" > $dns_file
  if [ "$DNS_SERVER" ]; then
     echo "nameserver $DNS_SERVER" >> $dns_file
     service -s dnsmasq &> /dev/null
  fi
  # reload dnsmasq
  if [ -z "$NO_START" ] && [ "`skill -n dnsmasq 2> /dev/null`" ]; then
       service dnsmasq reload > /dev/null 2>&1
  fi
}