RE: Linux server time getting out of sync frequently.


john...

be sure you carefully read the pdf that was provided...

in the situation where i was involved... we had a number of guest linux OS
boxes running on top of vmware. the boxes would lose serious amounts of
time... the pdf, and i believe the steps mentioned solved our issues...

but make sure you carefully look over the pdf doc..

-----Original Message-----
From: redhat-list-bounces@xxxxxxxxxx
[mailto:redhat-list-bounces@xxxxxxxxxx]On Behalf Of John Horne
Sent: Tuesday, May 27, 2008 3:04 PM
To: General Red Hat Linux discussion list
Subject: Re: Linux server time getting out of sync frequently.


On Tue, 2008-05-27 at 14:50 -0700, Josh Miller wrote:
John Horne wrote:
as i recall, there are a few parameters you can set within the vmware
app
for the guest os, in order to sync the timing, and to stop the skew
from
occuring...

i think you might also have to modify the kernel startup attributes.

The only solution I have found to work is to stop NTP on the guest and
simply run ntpdate (getting the time from other reliable server) every
hour or so via cron. The only 'solution' I have not tried is rebuilding
the kernel. Suggestions like use the PIT time source on the kernel
startup line may well improve the timekeeping, but it still loses time.

Hi, coming into this late, but I have been very successful with the
following solution:

1. make sure all ESX hosts are syncing time via NTP with a reliable source
2. disable NTPD in all guests
3. set each guest to sync time via VMware tools by setting
tools.SyncTime=TRUE
4. in each guest, on the kernel line in grub.conf, set clock=pit and
reboot

Tried it, but didn't work. The guests still lost time (although the host
was still accurate).


John.

--
---------------------------------------------------------------
John Horne, University of Plymouth, UK Tel: +44 (0)1752 587287
E-mail: John.Horne@xxxxxxxxxxxxxx Fax: +44 (0)1752 587001

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