This is a quick start guide to set up NTP on Centos 7
1. Install NTP service
yum install ntp
2. Start service
systemctl start ntpd
3. Enable service
systemctl enable ntpd
4. Edit NTP configuration
vi /etc/ntp.conf
Edit values for "server" eg
# Use public servers from the pool.ntp.org project.
# Please consider joining the pool (http://www.pool.ntp.org/join.html).
server uk.pool.ntp.org iburst
#server 3.centos.pool.ntp.org iburst
5. Restart NTP
systemctl restart ntpd
6. Check all is working
ntpq -p
and
timedatectl