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>14.5. NTP - Network Time Protocol</H1
><P
> A networked computer (even if just over a modem) can
check its own clock automatically by comparing it to the time
on another computer known to keep accurate time. Network Time
Protocol (or NTP) does exactly that. It is a method of verifying
and correcting your computer's time by synchronizing it with a
another system. With NTP your system's time can be maintained
to within milliseconds of Coordinated Universal Time. Visit
<A
HREF="http://www.time.gov/about.html/"
TARGET="_top"
> http://www.time.gov/about.html</A
> for more info.
</P
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> For more casual Linux users, this is just a nice luxury.
At my home all our clocks are set based upon what my Linux system
says the time is. For larger organizations this "luxury" can
become essential. Being able to search log files for events based
upon time can make life a lot easier and take a lot of the "guess work"
out of debugging.
</P
><P
> Another example of how important NTP can be is with a SAN.
Some SAN's require NTP be configured and running properly to allow
for proper synchronization over filesystem usage, and proper
timestamp control. Some SANs (and some applications) can become
confused when dealing with files that have timestamps that are in
the future.
</P
><P
> Most Linux distributions come with a NTP package of some kind,
either a .deb or .rpm package. You can use that to install NTP, or you
can download the source files from <A
HREF="http://www.ntp.org/downloads.html"
TARGET="_top"
> http://www.ntp.org/downloads.html</A
> and compile it yourself. Either way,
the basic configuration is the same.</P
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