To configure a machine as an NTP client, You have to do the following steps
First you need to install ntp package on NTP client using below command
root@manivel:~# apt-get install ntp
You have to specify the NTP server ip address or domain name in "/etc/ntp.conf" file on NTP Client machine and disable the default pools. ( see below image)
Now you can verify NTP synchronization status using the below command
root@manivel:~# ntpq -p
