Syncing Linux time with time server (NTP)
The following is how you set your linux time server to continuously sync with the world time server (NTP server) to have the most accurate timing for your server.
The config works on my fedora server and should work on Redhat based linux… other distros may be similar but different path..
firstly link your local zone info to the /etc/localtime in this case our server is ‘Asia/Singapore’. The zone info in fedora is located at ’/usr/share/zoneinfo’.
Do a sym link from zone info u want to the /etc/localtime
ln -sf /usr/share/zoneinfo/Asia/Singapore /etc/localtime
Open the file ’/etc/sysconfig/clock’ set the UTC accordingly, in my case i set it as UTC=true
after its done you need to set the hardware clock by executing the command:
/sbin/hwclock --systohc
check if the system time is correct now by executing the ‘date’ command.
Next to sync the server automatically you need to have ntp package installed… use ‘yum install ntp’ to install easily.
Once its installed, edit the file ’/etc/ntp.conf’
add the line:
server time.asia.apple.com
you can add as many ntp server in the file.
Once done just do a first sync :
[root@passionstreams root]# ntpdate time.asia.apple.com Looking for host time.asia.apple.com and service ntp host found : sng-ntp.asia.apple.com 20 Jan 12:37:53 ntpdate[17605]: adjust time server 17.82.254.7 offset -0.139597 sec
as you see the server is adjusting its time with a 0.139597 sec delay.
thats it…
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