Re: [Xen-devel] Hackathon idea: domU return code

[Guido Trotter <ultrotter@xxxxxxxxx>]

On Wed, Apr 10, 2013 at 2:30 PM, Ian Campbell <Ian.Campbell@xxxxxxxxxx> wrote:

Hi,

> On Tue, 2013-04-09 at 11:36 +0100, Guido Trotter wrote:
>> Hi,
>>
>> A big question that we get often asked as Ganeti team is: could you
>> report the reason why an instance is down? In particular people would
>> love to know whether an instance was shut down by the user from
>> inside, crashed (and perhaps why), or was shutdown from the Xen side.
>> It would be great if Xen could report this information somehow to a
>> monitoring system.
>
> Xen reports this status to the toolstack, the SHUTDOWN_* code in
> xen//include/public/sched.h is exposed in the domain info of the domain
> before it is destroyed.
>
>>
>> Currently a colleague of mine has found some of this information in
>> the Xen logs, and also a patch floating on the list that was never
>> merged. Is anybody coming to the Dublin Xen Hackathon in May willing
>> to help on this (either mentoring one of us to get the change
>> done&merged or doing the change while we implement the ganeti
>> reporting side of it)?
>
> I'd be happy to advise on a libxl/xl implementation of some way to
> export this info outside the toolstack -- perhaps the most generically
> useful way to approach this would be for xl support for calling hook
> scripts on various events, not just domain termination.
>

Sounds great, thanks! We'll add it to the hackathon wiki page, then,
thanks for volunteering to mentor! :)

Guido

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