Configuring NTP clients
Use this procedure to configure a delegate hosts to synchronize its clocks with the NTP server on the Control Center master host. Perform this procedure only if the hosts do not have internet access. Repeat this procedure on each delegate host in your Control Center cluster.
- Log in to the Control Center delegate host as root, or as a user with superuser privileges.
Create a backup of the NTP configuration file.
cp -p /etc/ntp.conf /etc/ntp.conf.orig
Edit the NTP configuration file./
- Open /etc/ntp.conf with a text editor.
Replace all of the lines in the file with the following lines:
# Point to the master time server server MASTER_ADDRESS restrict default ignore restrict 127.0.0.1 restrict MASTER_ADDRESS mask 255.255.255.255 nomodify notrap noquery driftfile /var/lib/ntp/drift
- Replace both instances of MASTER_ADDRESS with the IPv4 address of the host where the NTP server is running (the Control Center master host).
- Save the file and exit the editor.
Stop Control Center.
systemctl stop serviced
Synchronize the clock with the master server.
Enable and start the NTP daemon.
Enable the ntpd daemon.
systemctl enable ntpd
Configure ntpd to start when the system starts.
Currently, an unresolved issue associated with NTP prevents ntpd from restarting correctly after a reboot, and the following commands provide a workaround to ensure that it does.
echo "systemctl start ntpd" >> /etc/rc.d/rc.local chmod +x /etc/rc.d/rc.local
systemctl start ntpd
- Enable the ntpd daemon.
Start Control Center.
systemctl start serviced