[one-users] onevm delete vs onevm cancel

[Shi Jin]

Hi Ruben,

Thank you very much for your information.
I wonder if there is such an OpenNebula command to simply call "virsh
shutdown" can not removing the images.
So it is not a SHUTDOWON (which removes the image) or CANCEL (which
calls "virsh destroy").
If it does not exist, could it be created? I would assume it is very
straightforward to do it.
Thank you very much.

Shi

On Sat, Apr 3, 2010 at 7:45 AM, Ruben S. Montero <rubensm at dacya.ucm.es> wrote:
> Hi
>
> In OpenNebula you can terminate a VM with three different methods:
>
> shutdown: Similar to a proper machine shutdown, it waits for the
> shutdown process so the VM disks are left in a clean state. Then VM
> images are deleted or copied back to $ONE_LOCATION/var/$VMID if
> save="yes" has been defined.
>
> cancel: The VM is killed, but the process is checked by OpenNebula, so
> if the process fails the VM remains in runn. So you can free the used
> resources. Also if cancel succeeds the VMDIR in the remote machine is
> not deleted
>
> delete: Similar to a hard kill, the cancel and TM delete commands are
> executed but their result is not checked (well, the output of the
> cancel and TM delete operation are in vm.log, but you have to check
> the file to find out). The VM is directly deleted from the database.
>
> So there is a risk of not really freeing resources with the delete
> operation. So the thumb rule: use cancel when you'd do kill, and
> delete when you'd like to do a kill -9.
>
> Cheers
>
> Ruben
>
> On Thu, Mar 25, 2010 at 9:59 PM, Shi Jin <jinzishuai at gmail.com> wrote:
>> Hi there,
>>
>> Could anyone explain to what the differences between the commands "onevm
>> delete" and "onevm cancel"?
>> I understand they both call the cancel() function of the one_vmm_kvm.rb
>> code, right?
>> The cancel() function in turn calls the "virsh destory" command to unplug
>> the power for the VM, correct?
>>
>> I guess they are different from "onevm shutdown", which calls the shutdown()
>> function in the VMM and in turn calls the "virsh shutdown" command. This
>> way, the VM are shutdown gratefully rather the sudden death of the previous
>> two cases.  Am I understanding things properly?
>>
>> Is there any difference betweehn "onevm delete" and "onevm cancel"?
>> Thank you very much.
>>
>> --
>> Shi Jin, Ph.D.
>>
>>
>> _______________________________________________
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>> Users at lists.opennebula.org
>> http://lists.opennebula.org/listinfo.cgi/users-opennebula.org
>>
>>
>
>
>
> --
> Dr. Ruben Santiago Montero
> Associate Professor (Profesor Titular), Complutense University of Madrid
>
> URL: http://dsa-research.org/doku.php?id=people:ruben
> Weblog: http://blog.dsa-research.org/?author=7
>



-- 
Shi Jin, Ph.D.