Other nodes reference the controller node for clock synchronization. Perform these steps on all other nodes.
Install the packages:
# yum install chrony
Edit the /etc/chrony.conf file and comment out or remove all but one server key. Change it to reference the controller node:
server controller iburst
Start the NTP service and configure it to start when the system boots:
# systemctl enable chronyd.service
# systemctl start chronyd.service
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