Perform these steps on the controller node.
Install the packages:
# apt-get install chrony
Edit the /etc/chrony/chrony.conf file and add, change, or remove the following keys as necessary for your environment:
server NTP_SERVER iburst
Replace NTP_SERVER with the hostname or IP address of a suitable more accurate (lower stratum) NTP server. The configuration supports multiple server keys.
Note
By default, the controller node synchronizes the time via a pool of public servers. However, you can optionally configure alternative servers such as those provided by your organization.
Restart the NTP service:
# service chrony restart
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