Configure NTP in linux

Configure NTP in centOS
1. Click System, select Administration and click Date & Time.
2. In the Date/Time Properties window, click the Network Time Protocol tab.
3. Check Enable Network Time Protocol. Next click Show advanced options and check Synchronize system clock before starting service. Finally, click OK.

Configure NTP (Console)

#/usr/sbin/ntpdate pool.ntp.org
immediately synchronizes the system clock. Make sure the ntpd service is not running before using this command.

#/sbin/service ntpd start
starts the ntpd service

#/sbin/service ntpd stop
stops the ntpd service

#/etc/ntp.conf
the above is not a command, it is the location of the ntpd configuration file