Re: [Xen-users] DomU suspension/hibernation

[Ian Murray <murrayie@xxxxxxxxxxx>]

On 18/06/13 19:44, Joshua Tuttle wrote:
> -----Original Message-----
> From: xen-users-bounces@xxxxxxxxxxxxx [mailto:xen-users-bounces@xxxxxxxxxxxxx] 
> On Behalf Of Ian Murray
> Sent: Tuesday, June 18, 2013 1:56 PM
> To: xen-users@xxxxxxxxxxxxx
> Subject: Re: [Xen-users] DomU suspension/hibernation
>
> On 18/06/13 16:42, Joshua Tuttle wrote:
> > -----Original Message-----
> > From: Ian Campbell [mailto:Ian.Campbell@xxxxxxxxxx]
> > Sent: Tuesday, June 18, 2013 11:33 AM
> > To: Joshua Tuttle
> > Cc: xen-users@xxxxxxxxxxxxx
> > Subject: Re: [Xen-users] DomU suspension/hibernation
> >
> > On Tue, 2013-06-18 at 15:16 +0000, Joshua Tuttle wrote:
> > > Hey,
> > >
> > >
> > >
> > > I thought there was supposed to be an ability for domUâs to be put
> > > into a hibernated state (E.g. current running tasks and memory) when
> > > dom0 is shutdown or rebooted. When
> > >
> > > I look in my /etc/default/xendomains file, I have the variableâs
> > > âXENDOMAINS_SAVE=/var/lib/xen/saveâ and âXENDOMAINS_RESTORE=trueâ.
> > > However, when I reboot, I always have
> > >
> > > to restart my domains manually and their state was not saved.
> > > My current configuration is as follows: Xen 4.2.1, dom0: Debian 7.0,
> > > domU:Debian 7.0, dom0 kernel 3.2.0-4
> > Are you using the Debian packages or Xen compiled from source?
> >
> > Which toolstack are you using?
> >
> > If you installed from source, did you enable the xendomains script
> > when you did so? (by invoking update-rc.d or something equivalent)
> >
> > Does manually running xendomains ("service xendomains stop" then "service xendomains 
> > start") produce any output?
> >
> > Ian.
> >
> >
> > I am using Xen compiled from source. 4.2.1 and the XL toolstack.
> > I ran update rc.d on xecommons, xend, xendomains, xen-watchdog.
> > Xend can probably be disabled, I'm not sure if having it running would be 
> > causing a problem.
> > Manually stopping xendomains produces a line that confirms xendomains is 
> > stopped.
> > Starting xendomains produces no output, but I check the service with "xl list"
> Have a read of http://osdir.com/ml/general/2013-05/msg46973.html and see if 
> this is the same issue (sorry for not linking directly to Xen, Google seems to 
> link to the wrong message when I follow its links).
>
> If it is the same issue, then a patch has been submitted and accepted which I 
> believe is destined for 4.3. Also, there was an issue around the regex stuff 
> which got cleared up by a previous patch that I traced back to yaji (maybe!). I 
> don't know when the other fix came in, so you may need to go to 4.22 to apply 
> the linked patch.
>
>
>
> Thanks for replying.
>
> I applied a patch " hotplug/Linux: xendomains compatibility with xl" , but 
> still have had no luck. The only thing it fixed, is if I place a symlink to my config 
> file in /etc/xen/auto, it will automatically start the domU instance. However, its still 
> not putting a previous instance into a hibernated state.
I think that is the same patch I linked... which is odd because it isn't 
supposed to fix an auto issue. I don't recall in issue for that myself. 
Did you patch against 4.2.2 or 4.2.1? If it is the yaji/regex issue then 
I think that would have caused issue against stopping rather than 
restarting, as it has issue with xl list -l, AFAIR.
I presume the save file gets created, but just incase, please try:-


(Assuming you have a domU running)
root@xen6:/var/lib/xen/save# service xendomains stop
Shutting down Xen domains: vpn2(save)....
 *   [done]
root@xen6:/var/lib/xen/save# ls /var/lib/xen/save
vpn2
root@xen6:/var/lib/xen/save# service xendomains start
Restoring Xen domains: vpn2
 *   [done]
root@xen6://var/lib/xen/save# ls /var/lib/xen/save
root@xen6://var/lib/xen/save#

for me, it is gone on the second ls.

If it is still there, what happens if you manually reload it with:-

xl restore /var/lib/xen/save/vpn2 (in my case)



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