[Openstack-operators] [openstack-dev] [nova] about rebuild instance booted from volume

Saverio Proto zioproto at gmail.com
Wed Mar 14 14:19:25 UTC 2018

My idea is that if delete_on_termination flag is set to False the
Volume should never be deleted by Nova.

my 2 cents


2018-03-14 15:10 GMT+01:00 Tim Bell <Tim.Bell at cern.ch>:
> Matt,
> To add another scenario and make things even more difficult (sorry (), if the original volume has snapshots, I don't think you can delete it.
> Tim
> -----Original Message-----
> From: Matt Riedemann <mriedemos at gmail.com>
> Reply-To: "OpenStack Development Mailing List (not for usage questions)" <openstack-dev at lists.openstack.org>
> Date: Wednesday, 14 March 2018 at 14:55
> To: "openstack-dev at lists.openstack.org" <openstack-dev at lists.openstack.org>, openstack-operators <openstack-operators at lists.openstack.org>
> Subject: Re: [openstack-dev] [nova] about rebuild instance booted from volume
>     On 3/14/2018 3:42 AM, 李杰 wrote:
>     >
>     >              This is the spec about  rebuild a instance booted from
>     > volume.In the spec,there is a
>     >        question about if we should delete the old root_volume.Anyone who
>     > is interested in
>     >        booted from volume can help to review this. Any suggestion is
>     > welcome.Thank you!
>     >        The link is here.
>     >        Re:the rebuild spec:https://review.openstack.org/#/c/532407/
>     Copying the operators list and giving some more context.
>     This spec is proposing to add support for rebuild with a new image for
>     volume-backed servers, which today is just a 400 failure in the API
>     since the compute doesn't support that scenario.
>     With the proposed solution, the backing root volume would be deleted and
>     a new volume would be created from the new image, similar to how boot
>     from volume works.
>     The question raised in the spec is whether or not nova should delete the
>     root volume even if its delete_on_termination flag is set to False. The
>     semantics get a bit weird here since that flag was not meant for this
>     scenario, it's meant to be used when deleting the server to which the
>     volume is attached. Rebuilding a server is not deleting it, but we would
>     need to replace the root volume, so what do we do with the volume we're
>     replacing?
>     Do we say that delete_on_termination only applies to deleting a server
>     and not rebuild and therefore nova can delete the root volume during a
>     rebuild?
>     If we don't delete the volume during rebuild, we could end up leaving a
>     lot of volumes lying around that the user then has to clean up,
>     otherwise they'll eventually go over quota.
>     We need user (and operator) feedback on this issue and what they would
>     expect to happen.
>     --
>     Thanks,
>     Matt
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