Opbzil

NTP is installed by default in Linux 6 and 7

Main config file is /etc/ntp.conf

THings have changed a bit RHEL 6 and older

chkconfig ntpd on
service ntpd start

RHEL 7

systemctl enable ntpd
systemctl status ntpd

Checking if ntp server is available from the machine

ntpdate -q ip-address|name of NTP server

once you verified it you can use

ntpdate ip-address|name of NTP server

To set up time

You can check it with

ntpq -p
ntpstat

To quickly synchronize the servers

# systemctl stop ntpd
# ntpdate 10.5.6.11
5 Jul 10:36:58 ntpdate[2190]: adjust time server 95.81.173.74 offset -0.005354 sec
# systemctl start ntpd

Setting Firewall in RHEL 7