Linux server time getting out of sync frequently.

[bruce]

josh!!!

thanks, you found the article that i was thinking of, and your steps are
pretty much what i recall we ran into!!!



-----Original Message-----
From: redhat-list-bounces at redhat.com
[mailto:redhat-list-bounces at redhat.com]On Behalf Of Josh Miller
Sent: Tuesday, May 27, 2008 2:51 PM
To: General Red Hat Linux discussion list
Subject: Re: Linux server time getting out of sync frequently.


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

That has been a bulletproof method for me with over 70 linux guests.

re:  http://www.vmware.com/pdf/vmware_timekeeping.pdf

HTH,
Josh Miller - RHCE, VCP

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