server	127.127.1.0	# local clock
fudge	127.127.1.0 stratum 10	
#server  pool.ntp.org
server  0.us.pool.ntp.org
server  1.us.pool.ntp.org
server  2.us.pool.ntp.org

cat /etc/ntp.conf
# Sample /etc/ntp.conf:  Configuration file for ntpd.
#
# Undisciplined Local Clock. This is a fake driver intended for backup
# and when no outside source of synchronized time is available. The
# default stratum is usually 3, but in this case we elect to use stratum
# 0. Since the server line does not have the prefer keyword, this driver
# is never used for synchronization, unless no other other
# synchronization source is available. In case the local host is
# controlled by some external source, such as an external oscillator or
# another protocol, the prefer keyword would cause the local host to
# disregard all other synchronization sources, unless the kernel
# modifications are in use and declare an unsynchronized condition.
#
server	127.127.1.0	# local clock
fudge	127.127.1.0 stratum 10	
#server  pool.ntp.org
server  0.us.pool.ntp.org
server  1.us.pool.ntp.org
server  2.us.pool.ntp.org

#
# Drift file.
# Put this in a directory which the daemon can write to.
# No symbolic links allowed, either, since the daemon updates the file
# by creating a temporary in the same directory and then rename()'ing
# it to the file.
#
driftfile /etc/ntp/drift
#
# Log file
#
logconfig=allclock +allpeer +allsys +allsync
logfile /var/log/ntp.log
#
# Statistics stuff
#
statsdir /var/log/ntpstats/	# directory for statistics files
filegen	peerstats file peerstats type day enable
filegen	loopstats file loopstats type day enable
filegen	clockstats file clockstats type day enable

multicastclient	224.0.1.1
broadcastdelay	0.008

#
# Keys file.  If you want to diddle your server at run time, make a
# keys file (mode 600 for sure) and define the key number to be
# used for making requests.
# PLEASE DO NOT USE THE DEFAULT VALUES HERE. Pick your own, or remote
# systems might be able to reset your clock at will.
#
#keys		/etc/ntp/keys
#trustedkey	65535
#requestkey	65535
#controlkey	65535

# Don't serve time or stats to anyone else by default (more secure)
restrict default noquery nomodify
# Trust ourselves.  :-)
restrict 127.0.0.1

cat /etc/rc.d/rc.ntpd
#!/bin/sh
# Start/stop/restart ntpd.

# Start ntpd:
ntpd_start() {
  CMDLINE="/usr/sbin/ntpd -g"
  echo -n "Starting NTP daemon:  $CMDLINE"
  $CMDLINE -p /var/run/ntpd.pid
  echo
}

# Stop ntpd:
ntpd_stop() {
  echo -n "Stopping NTP daemon..."
  if [ -r /var/run/ntpd.pid ]; then
    kill -HUP $(cat /var/run/ntpd.pid)
    rm -f /var/run/ntpd.pid
  else
    killall -HUP -q ntpd
  fi
  echo
}

# Restart ntpd:
ntpd_restart() {
  ntpd_stop
  sleep 1
  ntpd_start
}

# Check if ntpd is running
ntpd_status() {
  if [ -e /var/run/ntpd.pid ]; then
    echo "ntpd is running."
  else 
    echo "ntpd is stopped."
    exit 1
  fi
}

case "$1" in
'start')
  ntpd_start
  ;;
'stop')
  ntpd_stop
  ;;
'restart')
  ntpd_restart
  ;;
'status')
  ntpd_status
  ;;
*)
  echo "usage $0 start|stop|restart|status"
esac