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Synchronizing the System Clock

Computer systems’ clocks tend to drift. Therefore, a fairly basic configuration task is
to connect your system to a Network Time Protocol (NTP) server that will keep it
within a couple of seconds of the correct time.
To synchronize your system clock with an NTP server, add the following lines to /var/
spool/cron/crontabs/root:
# update time with NTP server
0 3,9,15,21 * * * /usr/sbin/rdate 128.2.136.71 | logger -t NTP
If the file doesn’t exist, you can create it with the command:
# touch /var/spool/cron/crontabs/root
The IP address 128.2.136.71 belongs to Carnegie Mellon University’s public time
server. You can use a different time server if you wish.
Modify permissions on the crontab file by running:
# chmod 600 /var/spool/cron/crontabs/root
and restart the cron service by running:
# /etc/init.d/cron restart
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