Configuring the NTP Daemon
Install NTPD
sudo yum install ntp
Check NTPD Configuration
Check the server lines in /etc/ntp.conf. Modern config setups sometimes delegate the server lists to:
/etc/ntp/ntpservers:
clock.redhat.com
clock2.redhat.com
/etc/ntp/step-tickers:
clock.redhat.com
clock2.redhat.com
If you are acting as a master for other clients on your network you will need to uncomment the following line and modify the network address in /etc/ntp.conf:
# Hosts on local network are less restricted.
restrict 192.168.1.0 mask 255.255.255.0 nomodify notrap
Restart NTPD
sudo service ntpd restart
It is a good idea to tail /var/log/messages and make sure the ntpd started happily.
Verify NTPD Peering
sudo ntpq -p
Verify NTPD Synchronization
You will need to wait 20 minutes after restarting the ntpd before this command will display the proper results:
sudo ntptrace
Enable Service on Restart
sudo chkconfig ntpd on