openstack-manuals/doc/install-guide/source/environment-ntp-other.rst

Other nodes

Other nodes reference the controller node for clock synchronization. Perform these steps on all other nodes.

Install and configure components

1. Install the packages.

   For Ubuntu:

   # apt install chrony

   For RHEL or CentOS:

   # yum install chrony

   For SUSE:

   # zypper install chrony

2. Configure the chrony.conf file and comment out or remove all but one server key. Change it to reference the controller node.

   For RHEL, CentOS, or SUSE, edit the /etc/chrony.conf file:

   server controller iburst

   For Ubuntu, edit the /etc/chrony/chrony.conf file:

   server controller iburst

3. Comment out the pool 2.debian.pool.ntp.org offline iburst line.

4. Restart the NTP service.

   For Ubuntu:

   # service chrony restart

   For RHEL, CentOS, or SUSE:

   # systemctl enable chronyd.service
   # systemctl start chronyd.service