Sync Linux Time With Windows Domain Controller Time

If you use a Linux box in a Windows domain environment, you may want to sync its time with the domain's. Here is how:

• Add domain controller to server pool in /etc/openntpd/ntpd.conf

# $OpenBSD: ntpd.conf,v 1.7 2004/07/20 17:38:35 henning Exp $
# sample ntpd configuration file, see ntpd.conf(5)

# Addresses to listen on (ntpd does not listen by default)
#listen on *
#listen on 127.0.0.1
#listen on ::1

# sync to a single server
#server ntp.example.org

# use a random selection of 4 public stratum 2 servers
# see http://twiki.ntp.org/bin/view/Servers/NTPPoolServers
# and http://www.pool.ntp.org/
server your_domain_controller
#server 0.debian.pool.ntp.org
#server 1.debian.pool.ntp.org
#server 2.debian.pool.ntp.org
#server 3.debian.pool.ntp.org

• Add '-s' to DAEMON_OPTS in /etc/default/openntpd (from man page: "-s     Set the time immediately at startup if the local clock is off by more than 180 seconds.  Allows for a large time correction, eliminating the need to run rdate(8) before starting .")

# /etc/default/openntpd

# Append '-s' to set the system time when starting in case the offset
# between the local clock and the servers is more than 180 seconds.
# For other options, see man ntpd(8).
DAEMON_OPTS="-s -f /etc/openntpd/ntpd.conf"