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Synchronizing clock with NTP

Last Updated: May 4th, 2014

Installation​

CentOS​

yum install ntp ntupdate

Debian/Ubuntu​

apt-get install ntp ntupdate

Configuring​

Adding time servers (you can add other servers too)

nano /etc/ntp.conf

server time.nist.gov
server time-nw.nist.gov

Manually Updating​

ntpdate time.nist.gov

Automatically Updating​

Option 1​

chkconfig ntpd on
service ntpd start

Option 2​

To make it update at startup, add ntpdate time.nist.gov to /etc/rc.local