-----Oorspronkelijk bericht----- Van: libvirt-users-bounces@redhat.com [mailto:libvirt-users- bounces@redhat.com] Namens Jérôme Verzonden: woensdag 23 september 2015 15:03 Aan: libvirt-users@redhat.com Onderwerp: [libvirt-users] Time syncing after VM suspend/resume
Hi all.
When resuming guest after suspend, the time is wrong (because the guest doesn't know it has been suspended).
Apparently, ntp running on the guest doesn't solve this. At least on Linux system. I read it works on Windows guests. I don't understand why, so I'd appreciate a link to an explanation, but I understand it is out of scope for this list.
Linux has two methods to use ntp: ntpdate: It will run once at boot time to sync time. (This is probably installed on your system) It will not run after suspend and resume... => no correction ntpd: Continuously adjusts time. The deamon also calculates the drift to anticipate differences. I use this one and works perfectly.
The HW clock is correct and the guest agent is setup to use kvm-clock.
Using the guest-set-time command does set the clock on the guest according to the host. But this is not triggered automatically on resume.
I found discussions about this, even a patch proposal to call guest-set-time on resume, but all of this is one year old and I can't find any newer information.
http://serverfault.com/questions/334698/how-to-keep-time-on-resumed-kvm- guest-with-libvirt https://www.redhat.com/archives/libvirt-users/2014-October/msg00009.html https://www.redhat.com/archives/libvir-list/2014-February/msg00520.html
Is there any fresher information I have missed ?
Thanks.
-- Jérôme
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