{{tag>en en:linux en:time}} 
====== Ntp ======
There is several ways to do time synchronization with [[Debian]] :
  * ntpdate : for one time synchronization
  * ntp : provide a daemon for permanent synchronization

ntpdate is simplier, this page describe how to use it.

===== Installation =====
Installer the package :
  * ntpdate

===== Use =====
ntpdate can be used directly on the command line :
<code>
# ntpdate pool.ntp.org
 6 Mar 22:24:06 ntpdate[7114]: step time server 88.191.75.243 offset -4.566845 sec
#
</code>

===== Automatic synchronization =====
To make the time synchronization permanent, we will use cron, for example by adding the file ///etc/cron.d/ntp// with the following content :
<file>
59 * * * * root /usr/sbin/ntpdate pool.ntp.org >> /var/log/cron.log
</file>

===== Backup =====
  * /etc/cron.d/ntp