[libvirt] Crash state and QEMU
Anthony Liguori
aliguori at us.ibm.com
Tue May 10 19:28:20 UTC 2011
On 05/10/2011 02:04 PM, Richard W.M. Jones wrote:
> On Tue, May 10, 2011 at 01:26:39PM -0500, Anthony Liguori wrote:
>> As far as I can tell, if QEMU exits abruptly or with a non-zero
>> status code, libvirt treats this as a domain destruction given no
>> real indication to the user that something bad happened.
>
> libvirtd raises an event.
But that event is no different than the event fired for a normal guest
shutdown, no?
> There is (was?) a "reason" argument
> (eg. "reason" == "watchdog fired"). I've a vague recollection this
> was discussed but never added. I can't find it in the code right now,
> but I might be looking for the wrong thing ...
>
>> But libvirt does have a crashed state for domains, it's just not
>> used for QEMU guests.
>
> I'll just make a historical note that the crashed state corresponded
> to a state in Xen. Essentially the states in libvirt are directly
> mapped to the ones listed in the Xen xm man page here:
>
> http://linux.die.net/man/1/xm
I'm well aware of that :-)
That's why I asked whether not using the crash state was intentional (if
it's deprecated as a general API).
Regards,
Anthony Liguori
>
>> I was wondering how intention of a design decision this was. Right
>> now there's no good way for a management tool to detect a crashed
>> guest/QEMU. Is there something I'm overlooking?
>
> Rich.
>
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