Set up NTP Server and Client

NTP Server

Step 1: Install Chrony NTP package

yum install chrony

Step 2: Enable Chrony to start after boot:

systemctl enable chronyd

Step 3: Set Chrony to act as an NTP server for a local network

To turn Chrony into an NTP server, add the following line to the main Chrony /etc/chrony.conf configuration file. Change the address to your network address.

allow 10.1.1.0/24

Step 4: Restart Chrony NTP daemon to apply the changes

systemctl restart chronyd

Step 5: Open the firewall port to allow for incoming NTP requests

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

NTP Client

Step 1: Install Chrony NTP package

yum install chrony

Step 2: Enable Chrony to start after boot:

systemctl enable chronyd

Step 3: Set Chrony to act as an NTP client

Add the following line in the Chrony /etc/chrony.conf configuration file: Change the IP address to your NTP server.

Server 10.1.1.10

Step 4: Restart Chrony NTP daemon to apply the changes

systemctl restart chronyd

Step 5: Check for NTP server sources. 

Your local NTP server should be listed:

chronyc sources
MS Name/IP address         Stratum Poll Reach LastRx Last sample
===============================================================================
^? LAB-DC1.lab.local         4   6     1     2    +31us[  +31us] +/-   44ms