This tutorial will guide you with step by step installation of NTP Server on your server which can help your local network sync the time with it.
Acroynm NTP – Network Time Protocol
Question 1
==> Why do we need network time protocol, why do i need to sync my time with the server. ?
Ans : The easy answer is Security auditing reasons, and the long answer is many application when deployed to work in conjunction with one or more servers to give appropriate data or service (Clustering or Replication) it cannot serve you with two different time on both the servers.
Also it becomes very tedious for a system administrator to analyze logs generated in the same time with different timestamps. So now let dive in to installing NTP on the server.
Go to “http://www.ntp.org/downloads.html” and download the latest stable version of NTP Source (Network Time Protocol on Linux).
ashwin@deskktop /opt]# mkdir ntp ashwin@deskktop /opt/ntp]# ls ashwin@deskktop /ntp-4.2.6p3]# tar -zxf ntp-4.2.6p3.tar.gz ashwin@deskktop /ntp-4.2.6p3]# ./configure ashwin@deskktop /ntp-4.2.6p3]# make ashwin@deskktop /ntp-4.2.6p3]# make install
Once NTP is installed you ned to make some change to the ntp.conf located in the /etc directory
open ntp.conf
ashwin@deskktop /ntp-4.2.6p3]# vi /etc/ntp.conf
Add or Edit the following lines
restrict default ignore # Permit All access the following networks restrict 127.0.0.1 # Network without restrict but cannot modify time on the server restrict 192.168.1.0 mask 255.255.255.0 nomodify notrap # Network Time Protocol Servers from where your local NTP server will be updates. Can Check the following link for a pool near to you (http://www.pool.ntp.org/) server 0.in.pool.ntp.org server 1.asia.pool.ntp.org server 0.asia.pool.ntp.org
Save the file
ashwin@deskktop /ntp-4.2.6p3]# service ntpd start ashwin@deskktop /ntp-4.2.6p3]# ntpq -p The result showed should not contain 0.0 values in the delay and offset. Once this is done the final step is to check the system firewall or any network firewall in your network to give access to NTP server.
From the Client from where you want to sync the time execute the commands
where 10.0.0.1 is your NTP server IP Address
ashwin@system2 /~]# date -q 10.0.0.1 server 10.0.0.1, stratum 0, offset 0.000000, delay 0.00000 7 Feb 03:52:14 ntpdate[2115]: no server suitable for synchronization found
If you see the above result please check your NTP Server ntp.conf file restrict line and allow your network.
ashwin@system2 /~]# ntpdate -u 10.0.0.1 7 Feb 14:47:26 ntpdate[2664]: step time server 172.16.16.105 offset -1.079103 sec
Hope this tutorial is informative. Please comment your feedback.
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