How to Sync with an NTP Server

This page describes how to sync Votiro's Virtual Appliance with an NTP Server.

The Virtual Appliance standard installation contains the pre-configured CentOS NTP server.

Obtain a list of servers, using the following command:

# cat /etc/ntp.conf | grep server

Syncing with an NTP server - Server List

To configure the NTP server there are two methods for you to choose from:

External NTP server.

Internal NTP server.

External NTP Server

To work with the pre-configured CentOS public NTP servers, follow these steps:

On your organization's firewall open port 123 UDP.

Add the NTP servers, using the following command:

*.centos.pool.ntp.org

To work with an internal NTP server, follow these steps:

Ensure port 123 UDP is opened between the VA network and the NTP server.

Ensure you can access your NTP server from each node, using the following command:

# ntpdate -u -s <ntp-server-fqdn>

Add the FQDN to the NTP configuration file, using the following command:

# vi /etc/ntp.conf

To edit the file, click the Insert key on your keyboard.

Enter the server address in the following format:

Syncing with an NTP server - Server Address

server <ntp-server-fqdn> iburst

To Save and Exit, key the following commands:

:wq!

# sudo systemctl restart ntpd

To verify the time of syncronization, log in to each node, using the following command:

# timedatectl

Syncing with an NTP server - Verify time of sync