[one-users] onevm delete vs onevm cancel

[Ruben S. Montero]

Hi Shi,

There are a couple of issues that describes a similar problem
http://dev.opennebula.org/issues/242
http://dev.opennebula.org/issues/132

Cheers

Ruben

On Fri, May 21, 2010 at 1:26 AM, Shi Jin <jinzishuai at gmail.com> wrote:
> 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.
>>>
>>>
>>> _______________________________________________
>>> Users mailing list
>>> 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.
>



-- 
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