openstack team mailing list archive

[Sam Stoelinga <sammiestoel@xxxxxxxxx>]

Hi Ale,

It's the first time I see nova rescue, maybe this should be somewhere else
in the documentation. Maybe the part related to migration, that's where I
looked and tried.

I first tried to do migration of the VM on a dead host, but that didn't
work then after searching I stumbled upon this patch to enable the
functionality to move VMs from a dead host:
https://review.openstack.org/#/c/11086/12
But it wasn't available for Essex, and won't be in Folsom either. So I
thought this functionality was not there yet either. Searched for ours
documentation and google, but never saw anything about rescue.
Is the functionality the same as the above patch? I looked at the code, and
the code seems much smaller. The above patch seems to do more cleaning up
also.

Because I didn't know about nova rescue I already copied the patch to Essex
successfully, but maybe it's safe to use nova rescue.
This is the evacuate patch for stable essex:
https://review.openstack.org/#/c/13282/

Do I understand right that this is the workflow:
nova rescue instance1
Look if the state changed to RESCUED
if it's rescued do a nova unrescue instance1
which cleans up the resources used for rescuing and changes the state back
to ACTIVE on the vm?

Thanks a lot, sure is helpful.

Sam

On Wed, Sep 19, 2012 at 9:12 PM, Alejandro Comisario <
alejandro.comisario@xxxxxxxxxxxxxxxx> wrote:

> if you are on essex, you can issue a "nova rescue", if in cactus, you have
> to manipulate the "instances" table to tell where the new instance will be
> running, and then from the new compute node issue a :
>
> virsh define /path/to/XML
> virsh start instance_name
>
> From that moment, you can manage the instance using euca / nova
> *
> *
> *Ale*
>
> On Wed, Sep 19, 2012 at 4:03 AM, Wolfgang Hennerbichler <
> wolfgang.hennerbichler@xxxxxxxxxxxxxxxx> wrote:
>
>> Hello Folks,
>>
>> Although it seems a pretty straightforward scenario I have a hard time
>> finding documentation on this.
>> One of my compute nodes broke down. All the instances are on shared
>> storage, so no troubles here, but I don't know how to tell openstack that
>> the VM should be deployed on another compute node. I tried fiddling around
>> in the mysql-db with no success.
>> Any help is really appreciated.
>>
>> Wolfgang
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