You can configure NTP to get time from an internal reference source such as a GPS with serial port, which syncs with an atomic clock via satellite.

http://www.ntp.org/ntpfaq/NTP-s-refclk.htm

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Jeff Squyres wrote:


On Thu, 20 Nov 2003, jix kicks wrote:


I am using redhat9.but my head node don't have any public ipaddress that
connect to internet.so it failes to connect to the ntp server is it
mandatory for this oscar to have internet connection ???or what is
alternative ???  jix


I ran into this exact problem when we were practicing our demo for SC --
we were installing OSCAR on a totally disconnected cluster; see bug 845179
(https://sourceforge.net/tracker/index.php?func=detail&aid=845179&group_id=9368&atid=109368O).
:-)

In hindsight, it may be possible to simply deselect the NTP servers that
are listed in the configurator (we didn't try this on the SC floor -- we
just strategically edited areas of the NTP package to delete the
/etc/ntp/step-tickers file after it was generated).

Does this work for you?

Note, too, that you *must* install the ntpconfig package because if you
don't, you'll get a failure later because some other RPM depends on the
ntp RPM.  And ntp is not listed in the RH90 base RPM list -- it's only
listed in the ntpconfig package.




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