Question: How do I install and configure NTP under CentOS Linux 5 server to synchronize the system clock?

Answer: You can easily install NTP (Network Time Protocol, a means of transmitting time signals over a computer network) using yum command under Redhat or CentOS/Fedora core Linux.

Procedure

Login as the root user

Type the following command to install ntp:

# yum install ntp

Turn on service:

# chkconfig ntpd on

Synchronize the system clock with 0.pool.ntp.org server:

# ntpdate pool.ntp.org

Start the NTP:

# /etc/init.d/ntpd start