Re: [Xen-users] DomU suspension/hibernation

[Joshua Tuttle <jtuttle@xxxxxxxxx>]

-----Original Message-----
From: Ian Murray [mailto:murrayie@xxxxxxxxxxx]
Sent: Tuesday, June 18, 2013 3:46 PM
To: Joshua Tuttle
Cc: xen-users@xxxxxxxxxxxxx
Subject: Re: [Xen-users] DomU suspension/hibernation

On 18/06/13 20:36, Joshua Tuttle wrote:
>
> -----Original Message-----
> From: Ian Murray [mailto:murrayie@xxxxxxxxxxx]
> Sent: Tuesday, June 18, 2013 3:19 PM
> To: Joshua Tuttle
> Cc: xen-users@xxxxxxxxxxxxx
> Subject: Re: [Xen-users] DomU suspension/hibernation
>
> 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)
>
>
>
>
> I applied it against 4.2.1. When I run "service xendomains stop" I receive 
> the following output:
>
> An error occurred while saving domain:
> Option `1' not supported.
> 'xl save' requires at least 2 arguments.
>
> !
> (shut)
> An error occurred while shutting down domain:
>
> !
> SHUTDOWN_ALL
> An error occurred while shutting down all domains:
>
> !
> [ ok ] [done].
>
>
>
>
>
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Is this different behaviour now because you said that part was working earlier?

What is the output of xl list -l ? I think this is the command xendomains uses 
to generate the list to shutdown.

Unfortunately, you are not in the territory I thought you were.




Yeah this is new behavior.  The only things I have changed so far are applying 
the patch and editing the xl.conf file to reflect  "OUTPUT_FORMAT=sxp".

Now I'm second guessing if I have applied the patch correctly.

Here are the lines from the new file


Lines 32 -39

CMD=${SBINDIR}/xm
HEADCOMP="LinuxGuestRecord"
$CMD list &> /dev/null
If test $? -ne 0
Then
        CMD=${SBINDIR}/xl
        HEADCOMP="Xen saved domain"
Fi


Line 260

If [ -f $dom ] ; then





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