The Network Time Protocol daemon (ntpd) program is a Linux operating system daemon. It sets and maintains the system time of day in synchronism with time servers (Mills).
You need to configure ntpd via /etc/ntp.conf configuration file. The file is well documented and you easily configure it.
Install ntpd
If ntpd is not installed use any one of the following command to install ntpd:
# yum install ntpOR# up2date ntp
Configuration
You should at least set following parameter in /etc/ntp.conf config file:
server <Time Server Name or IP Address>
For example, open /etc/ntp.conf file using vi text editor:
# vi /etc/ntp.conf
Locate server parameter and set it as follows:
server pool.ntp.org
Save the file and restart the ntpd service:
# /etc/init.d/ntpd start
You can synchronize the system clock to an NTP server immediately with following command:
# ntpdate pool.ntp.org
Output:
5 May 14:36:01 ntpdate[5257]: adjust time server 61.206.115.3 offset -0.343242 sec
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