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xen-devel
Re: [Xen-devel] Dom0 <> DomU clock sync
Hi Keir,
Thank you for your answer.
Ntpd is not running in dom0. I am updating the dom0 time with ntpdate
(crontab every hour).
Should ntpd be running on dom0 ?
Dom0
[root@xen01 /]# date
Mon Sep 3 15:59:37 CEST 2007
DomU (started 5 hours ago)
ns1 bin # date
Mon Sep 3 15:58:05 CEST 2007
ns1 bin # uptime
15:58:10 up 5:21, 3 users, load average: 0.00, 0.00, 0.11
But this is strange... I just rebooted the vm:
Dom0:
[root@xen01 /]# date
Mon Sep 3 16:04:13 CEST 2007
DomU:
ns1 ~ # date
Mon Sep 3 16:02:41 CEST 2007
There is already a difference when the vm is freshly rebooted.
Same after a shutdown/xm create....
Weird... Any idea ?
Thanks again!
--
Sébastien Riccio
SwissCenter / OpenBusiness SA
sr@xxxxxxxxxxxxxxxx
Keir Fraser a écrit :
You're not running ntpd in the domU as well, right? Just worth checking...
Apart from that I don't think you can be doing anything wrong. Any weirdness
after long uptime is of course interesting, as it's something that's hard
for developers to test.
If you create a new domU (doesn't need to be from scratch installation -
e.g., just restarting a domU, or starting an existing dormant domU, would
do) then is its time behind dom0, or in sync?
-- Keir
On 3/9/07 08:45, "Sébastien RICCIO" <sr@xxxxxxxxxxxxxxx> wrote:
Hello !
Just a quick question about time synchronization between xen dom0 and
domUs...
We're running Xen 3.1 64-bit, with 32 and 64 bits linux guests.
It's up since 89 days and the domU's time is around 5 minutes behind the
dom0,
which is updated via ntpdate...
Any idea why it doesn't sync the guests even that
/proc/sys/xen/independent_wallclock is 0 ?
Could it be an option that I missed in dom0/domU kernel ?
Thanks for your help !
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