[openstack-dev] [nova] how to address boot from volume failures

Andrey Kurilin akurilin at mirantis.com
Thu Oct 1 09:35:42 UTC 2015

>1) fix the client without a revert

I prefer to go with this option, since fix already done and pending review.

>This means that until people upgrade their
>client they loose access to this function on the server.

This applies to any of the proposed options.

On Thu, Oct 1, 2015 at 12:03 AM, Sean Dague <sean at dague.net> wrote:

> Today we attempted to branch devstack and grenade for liberty, and are
> currently blocked because in liberty with openstack client and
> novaclient, it's not possible to boot a server from volume using just
> the volume id.
> That's because of this change in novaclient -
> https://review.openstack.org/#/c/221525/
> That was done to resolve the issue that strong schema validation in Nova
> started rejecting the kinds of calls that novaclient was making for boot
> from volume, because the bdm 1 and 2 code was sharing common code and
> got a bit tangled up. So 3 bdm 2 params were being sent on every request.
> However, https://review.openstack.org/#/c/221525/ removed the ==1 code
> path. If you pass in just {"vda": "$volume_id"} the code falls through,
> volume id is lost, and nothing is booted. This is how the devstack
> exercises and osc recommends booting from volume. I expect other people
> might be doing that as well.
> There seem to be a few options going forward:
> 1) fix the client without a revert
> This would bring back a ==1 code path, which is basically just setting
> volume_id, and move on. This means that until people upgrade their
> client they loose access to this function on the server.
> 2) revert the client and loose up schema validation
> If we revert the client to the old code, we also need to accept the fact
> that novaclient has been sending 3 extra parameters to this API call
> since as long as people can remember. We'd need a nova schema relax to
> let those in and just accept that people are going to pass those.
> 3) fix osc and novaclient cli to not use this code path. This will also
> require everyone upgrades both of those to not explode in the common
> case of specifying boot from volume on the command line.
> I slightly lean towards #2 on a compatibility front, but it's a chunk of
> change at this point in the cycle, so I don't think there is a clear win
> path. It would be good to collect opinions here. The bug tracking this
> is - https://bugs.launchpad.net/python-openstackclient/+bug/1501435
>         -Sean
> --
> Sean Dague
> http://dague.net
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Best regards,
Andrey Kurilin.
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