Linux/Unix - NTP Configuration

To configure NTP in Linux/Unix update "/etc/ntp.conf" file, comment out original servers and list the new NTP servers that you need to configure.

For example, NTP-Server1: 10.100.100.21 & NTP-Server2: 10.100.100.22

• You may use "vi editor" to update the file and the syntax would be "vi /etc/ntp.conf"

# server 0.fedora.pool.ntp.org iburst
# server 1.fedora.pool.ntp.org iburst
# server 2.fedora.pool.ntp.org iburst
# server 3.fedora.pool.ntp.org iburst
server 10.100.100.21
server 10.100.100.22

• Start NTP service with command "service ntpd start"

[root@Linux~]# service ntpd start
[root@Linux~]#

• Execute command "ntpq -p" to check NTP.

[root@Linux~]# ntpq -p

remote refid st t when poll reach delay offset jitter
===============================================
10.100.100.21 .GPS. 1 u 46 64 1 9.794 105.780 0.001
10.100.100.22 .GPS. 1 u 45 64 1 8.491 107.515 0.001
[root@Linux~]#

 

•  Execute command "chkconfig ntpd on" for NTP configuration to survive reboot.

[root@Linux~]# chkconfig ntpd on 
[root@Linux~]#