Network Time Protocol (NTP)
NTP is used to synchronize the time of a remote computer system over the network. It oprates on port 123.
1. Configure NTP server
a. Edit /etc/ntp.conf file and specify the ntp server which you want to sync your system with remote system.
Note: Normally we sync the time with local time clock or University time clock.
# vi /etc/ntp.conf
uncomment the server section, in my case, I am using the time server from Reston, va
# Time server from, Reston VA
# nist1.aol-va.symmetricom.com Reston, Virginia
server 64.236.96.53
b. save the file and restart the ntpd service
# service ntpd status
ntpd is stopped
# service ntpd start
Starting ntpd: [ OK ]
c. Make sure to start the ntpd service on every reboot.
# chkconfig --list ntpd
ntpd 0:off 1:off 2:off 3:off 4:off 5:off 6:off
# chkconfig ntpd on
# chkconfig --list ntpd
ntpd 0:off 1:off 2:on 3:on 4:on 5:on 6:off
# ntpq -p
remote refid st t when poll reach delay offset jitter
==============================================================================
nist01.ntp.aol. .ACTS. 1 u 5 64 1 19.956 -863494 0.000
st value is 1 so its a good one...
# ntpq -p
remote refid st t when poll reach delay offset jitter
===================================================
nist01.ntp.aol. .INIT. 16 u - 64 0 0.000 0.000 0.000
---------------------------------------------------------------------------------
Note: If you see ST value more than 5, your NTP is not syncing with the server. Please check and verify that server is operational.
Note: The Output jitter value of 000 or less than 1 is consider successfull
To check the NTP status,
# ntpstat -p
synchronised
time server re-starting
polling server every 64 s
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Setting up NTP Client
To setup NTP client, you just use the /etc/ntp.conf file and specify the NTP server name that you just created.
# vi /etc/ntp.confComment that all begins with server and add your NTP server info.
server 192.168.10.120
# service ntpd start
# chkconf ntpd on
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
To update or sync your client system with NTP server,
# ntpdate -u 192.168.10.120
NTP is used to synchronize the time of a remote computer system over the network. It oprates on port 123.
1. Configure NTP server
a. Edit /etc/ntp.conf file and specify the ntp server which you want to sync your system with remote system.
Note: Normally we sync the time with local time clock or University time clock.
# vi /etc/ntp.conf
uncomment the server section, in my case, I am using the time server from Reston, va
# Time server from, Reston VA
# nist1.aol-va.symmetricom.com Reston, Virginia
server 64.236.96.53
b. save the file and restart the ntpd service
# service ntpd status
ntpd is stopped
# service ntpd start
Starting ntpd: [ OK ]
c. Make sure to start the ntpd service on every reboot.
# chkconfig --list ntpd
ntpd 0:off 1:off 2:off 3:off 4:off 5:off 6:off
# chkconfig ntpd on
# chkconfig --list ntpd
ntpd 0:off 1:off 2:on 3:on 4:on 5:on 6:off
# ntpq -p
remote refid st t when poll reach delay offset jitter
==============================================================================
nist01.ntp.aol. .ACTS. 1 u 5 64 1 19.956 -863494 0.000
st value is 1 so its a good one...
# ntpq -p
remote refid st t when poll reach delay offset jitter
===================================================
nist01.ntp.aol. .INIT. 16 u - 64 0 0.000 0.000 0.000
---------------------------------------------------------------------------------
Note: If you see ST value more than 5, your NTP is not syncing with the server. Please check and verify that server is operational.
Note: The Output jitter value of 000 or less than 1 is consider successfull
To check the NTP status,
# ntpstat -p
synchronised
time server re-starting
polling server every 64 s
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Setting up NTP Client
To setup NTP client, you just use the /etc/ntp.conf file and specify the NTP server name that you just created.
# vi /etc/ntp.confComment that all begins with server and add your NTP server info.
server 192.168.10.120
# service ntpd start
# chkconf ntpd on
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
To update or sync your client system with NTP server,
# ntpdate -u 192.168.10.120
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