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This document explains how to automate
adjusting your servers' time through Network Time Protocol (NTP).
Server time synchronization prevents various errors that you are likely
to run into unless your servers' time is correct.
Automation of server time synchronization is implemented through setting up
crontab task for your NTP client.
To automate adjustment of your servers' time through NTP, do the following:
- Make sure you've got an NTP client software installed on your server(s).
* If not, download it from www.ntp.org.
- Log into your servers as root and use the "crontab -e" command to add an NTP cron task.
In the following example your server time is checked with a time server every 4 hours:
# date syncronization
0 */4 * * * /usr/sbin/ntpdate ntps1-{0,1,2}.uni-erlangen.de
NTP Time Servers
The following links will take you to the lists of time server hosts to choose from.
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Public NTP Pool Time Servers
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Public NTP Secondary (stratum 2) Time Servers
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Public NTP Primary (stratum 1) Time Servers
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