NTP (Network Time Protocol) is an Internet protocol used to synchronize the clocks of computers to some time reference. NTP is an Internet standard protocol originally developed by Professor David L. Mills at the University of Delaware.
Install and configure NTP (Network Time Protocol)
NTP package is provided by default on CentOS /RHEL 7 repositories and can be installed with command below
#yum install ntp
Turn on service as daemon, start automatically on rebooot
#chkconfig ntpd on
Start the NTP server, NTP will continuously adjusts system time from upstream NTP server