openntpd on openbsd on esx

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From: Clifford Bailey
Date: Tuesday, April 14, 2009 - 1:37 am

Hi,

I'm trying to run a couple of ntp servers using openntpd on openbsd
4.2 running as a vm on a vmware esx server. My problem is that the
machines never seem to become completely stable. They become
syncronised, but in 24 hours they may lose syncronisation 2 or 3
times.

I was wondering whether anyone on the list has been successful running
an ntp server in this way, or is this a known issue with ntp on
virtualised platforms? Is there anyway of tweaking the install to make
it more reliable?

If not, I will move the box onto some real hardware, but I only want
to do that if it's the only way.
Thanks in advance!

Cliff.

My Config
========

listen on x.x.x.x
servers 0.uk.pool.ntp.org


Sample log output
=============

Apr 12 22:52:39 ntpserver ntpd[20679]: clock is now synced
...
Apr 13 02:12:36 ntpserver ntpd[20679]: clock is now unsynced
Apr 13 02:16:24 ntpserver ntpd[20679]: clock is now synced
...
Apr 13 16:37:48 ntpserver ntpd[20679]: clock is now unsynced
Apr 13 16:41:31 ntpserver ntpd[20679]: clock is now synced
Apr 13 16:45:17 ntpserver ntpd[14714]: adjusting local clock by 0.033747s
Apr 13 19:52:58 ntpserver ntpd[14714]: adjusting local clock by 0.111834s
Apr 13 21:02:28 ntpserver ntpd[14714]: adjusting local clock by 0.061884s
Apr 13 21:10:01 ntpserver ntpd[14714]: adjusting clock frequency by
12.048466 to 87.819750ppm
Apr 13 22:19:45 ntpserver ntpd[14714]: adjusting clock frequency by
-14.207114 to 73.612636ppm
Apr 14 00:13:08 ntpserver ntpd[14714]: adjusting local clock by 0.034559s
Apr 14 01:09:51 ntpserver ntpd[14714]: adjusting local clock by 0.038054s
Apr 14 01:15:35 ntpserver ntpd[14714]: adjusting clock frequency by
8.482591 to 82.095227ppm
Apr 14 03:00:43 ntpserver ntpd[14714]: adjusting clock frequency by
10.570668 to 92.665895ppm
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Messages in current thread:
openntpd on openbsd on esx, Clifford Bailey, (Tue Apr 14, 1:37 am)
Re: openntpd on openbsd on esx, Janne Johansson, (Tue Apr 14, 1:51 am)
Re: openntpd on openbsd on esx, Peter Hessler, (Tue Apr 14, 1:51 am)