General Information

Synchronizing time to a central time server and also keeping in sync with a peer server.

This type of setup would be a tier two NTP setup, allowing for redundancy if the central source of time is lost. The two peers could agree on a time and provide it locally to other servers.

Setting up the “central time server” to allow the other servers to sync to it.

• Server: ipa.example.com (192.168.1.152)

Ensure that the firewall allows NTP in

firewall-cmd --permanent --add-service=ntp
firewall-cmd --reload

Setup a NTP client to peer/sync with the NTP server.

Install required package

yum install ntp

Enable and start the service

systemctl enable ntpd
systemctl start ntpd

Edit the NTP config file

vim /etc/ntp.conf
 
# Comment out all server lines, add peer for the newly created NTP server
peer 192.168.1.200

Restart the service

systemctl restart ntpd

Open the firewall for ntp

firewall-cmd --permanent --add-service=ntp
firewall-cmd --reload