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xen-users
Re: [Xen-users] NTP time issues DomU's
Ian Pratt wrote:
yeah, i'm already doing that, I was just saying, it *seemed*
like they were getting their time from domain0, and weren't
actually changing their own clocks in accordance with syncing
with the same ntpd server.
especially since they're all off by exactly the same amount
... and running ntpdate doesn't seem to have any effect whatsoever?
If you don't run ntp in the domU's, it should just work.
If you want to run ntp in the domU, try:
echo 1 > /proc/sys/xen/independent_wallclock
I guess we could be smarter about this, and make the wall clock
independent automatically if someone does an adjtimex syscall. Anyone
got any comments on this?
Ian
On Thu, 12 May 2005, Fernando Maior wrote:
On 5/12/05, andrew mathes <amathes@xxxxxxxxxxxx> wrote:
don't the DomU's just get their time from DomO? Ie. ...
even if they
weren't running ntp they'd always be synced with whatever DomO
thought about system time?
Maybe i'm way off
On Thu, 12 May 2005, Alex Tomkins wrote:
On Thu, May 12, 2005 at 10:42:53AM -0700, andrew mathes wrote:
So, from what it looks like (on my servers and the docs), all my
domains get their time from DomO. Which I have setting itself
through NTP, and the dom0 looks good. However, All of
the domains
are 1.5 seconds off, and won't ntp themselves on, also, an
identical server, all the domains are
.768 seconds off (off of the server i'm ntping to) , but both
domO's are withing (.02) and seem to narrow in as NTP is
supposed to.
So, question is, 1) what is going on here, and 2) can
anything be
done about it?
Are you using OpenNTPD by any chance?
My machines suffered from inaccurate clocks in DomU's,
even though
the clock was very accurate in Dom0. Switching to regular ntpd
solved this, DomU immediately used the correct time
shortly after starting ntpd.
--
Alex Tomkins <tomkins@xxxxxxxxxxxx>
Andrew,
Please remember, you allways shoult treat each virtual
machine like a
completely separated host! So far, you shoul configure ntpd to get
time from -possibly- the same host as you dom0 is getting time. Try
that. It won't hurt :) And I bet you will feel happy with
the result
:)
--
Bye,
Fernando Maior
LPIC/1 31908
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Something to think about, if the vms are syncing off the Dom0 then
there would be no way to configure the guest systems in different time
zones. To me that would be a plus with the vm's.
--
Paul Edgar
Content Delivery System
IBM/Austin
javaoops@xxxxxxxxxx
No trees were destroyed in the sending of this message, however, a significant number of electrons were terribly inconvenienced.
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