libvirt users - Oct 2020 - what does "virsh destroy" really ?

Hi,

what does "virsh destroy" with the domain ? Send a kill -9 to the
process ?

Bernd

-- 

Bernd Lentes 
Systemadministration 
Institute for Metabolism and Cell Death (MCD) 
Building 25 - office 122 
HelmholtzZentrum München 
bernd.lentes@helmholtz-muenchen.de 
phone: +49 89 3187 1241 
phone: +49 89 3187 3827 
fax: +49 89 3187 2294 
http://www.helmholtz-muenchen.de/mcd 

stay healthy
Helmholtz Zentrum München

Helmholtz Zentrum München

On 2020-10-05 6:04 p.m., Lentes, Bernd wrote:
> Hi,
> 
> what does "virsh destroy" with the domain ? Send a kill -9 to the
process ?
> 
> Bernd
> 
It forces the guest off, like pulling the power on a hardware machine.
Not sure of the exact mechanism behind the scenes. It does leave the
server defined and you can reboot it again later (albeit like restoring
power to a normal machine, so it might need to replay journals, etc).

-- 
Digimer
Papers and Projects: https://alteeve.com/w/
"I am, somehow, less interested in the weight and convolutions of
Einstein’s brain than in the near certainty that people of equal talent
have lived and died in cotton fields and sweatshops." - Stephen Jay Gould

On Mon, Oct 05, 2020 at 07:12:34PM -0400, Digimer wrote:
>On 2020-10-05 6:04 p.m., Lentes, Bernd wrote:
>> Hi,
>>
>> what does "virsh destroy" with the domain ? Send a kill -9 to
the process ?
>>
>> Bernd
>>
>
>It forces the guest off, like pulling the power on a hardware machine.
>Not sure of the exact mechanism behind the scenes. It does leave the
>server defined and you can reboot it again later (albeit like restoring
>power to a normal machine, so it might need to replay journals, etc).
>
The technical details should not matter, but it tries to send "quit"
to QEMU and
falls back to killing it IIRC (firsh with SIGTERM and then with SIGKILL). 
Don't
do that if you want to use the machine again ;-)
>--
>Digimer
>Papers and Projects: https://alteeve.com/w/
>"I am, somehow, less interested in the weight and convolutions of
>Einstein’s brain than in the near certainty that people of equal talent
>have lived and died in cotton fields and sweatshops." - Stephen Jay
Gould
>
>

----- Am 6. Okt 2020 um 1:12 schrieb Digimer lists@alteeve.ca:
> On 2020-10-05 6:04 p.m., Lentes, Bernd wrote:
>> Hi,
>> 
>> what does "virsh destroy" with the domain ? Send a kill -9 to
the process ?
>> 
>> Bernd
>> 
> 
> It forces the guest off, like pulling the power on a hardware machine.
> Not sure of the exact mechanism behind the scenes. It does leave the
> server defined and you can reboot it again later (albeit like restoring
> power to a normal machine, so it might need to replay journals, etc).

Hi,

I know what it does, i'd like to know _how_ it does it.
Maybe i have to look in the source code, although i'm not a big code reader
and much less a code developer.
Where can i find it ?

Bernd
Helmholtz Zentrum München

Helmholtz Zentrum München