Sometime your server internal clock somewhat erratic. Which is not acceptatble on production environment, In this tutorial you will be learn to Syncronize system clock on linux server with ntp server.
if you didn’t installed ntp server then install it useing following steps.
Centos/RHEL
# yum install ntp
#chkconfig ntpd on
#chkconfig ntpd on
ubuntu
#apt-get install ntp
Append the NTP server in /etc/ntp.conf file you’ll be synchronizing with. For instance.
server 3.in.pool.ntp.org
start the ntp service.
#server ntpd start
#/etc/init.d/ntp
#/etc/init.d/ntp
That’s it.