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#openstack-nova - 2019-10-01
15:45:15 efried Is that a behavior change that could possibly cause a problem for anyone?
15:45:48 efried perhaps gmann could also advise?
15:46:26 mordred efried: it shouldn't cause a problem for SDK - we treat the version document payload as authoritative
15:46:54 mordred but - if there are people who are doing blind url appending - maybe that's a behavior change that would break them?
15:47:05 mriedem i want to say novaclient has had to deal with the trailing slash stuff to get the version document and avoid the 302
15:47:08 efried what do you mean, blind url appending?
15:47:19 mriedem i think sdague added that and alex is probably familiar with it
15:47:40 efried mriedem: so worst case novaclient is doing an extra thing that's no longer necessary, rite?
15:48:09 mriedem probably, details are in here https://github.com/openstack/python-novaclient/blob/003ac57d9af74aa4658a7bf6cc6b6b3bafa58c11/novaclient/v2/versions.py#L36
15:48:28 efried mordred: /v2/stuff will still go into the real API, not hit version discovery
15:48:43 mordred ah - yeah
15:49:18 mordred I mean - then in that case, I think it's no problem - because what a person is looking for is the version document
15:49:23 mordred and they'll be getting it
15:49:38 mriedem i also remember this craziness that andreykurilin fixed https://github.com/openstack/python-novaclient/blob/003ac57d9af74aa4658a7bf6cc6b6b3bafa58c11/novaclient/v2/versions.py#L83
15:49:40 mordred I agree with "novaclient might be doing an extra step it doesn't need to do anymore" part
15:49:42 stephenfin efried: I assume there's a very good reason that it's not possible to retain the 302 redirect?
15:50:12 mordred stephenfin: bunny rabbits
15:50:14 efried mriedem: yeah, so that novaclient blip would become unnecessary - but only for deployments actually running this code, so I'm not gonna like rip it out right away or anything.
15:50:45 mriedem more like ever
15:50:45 mordred yah- that's why we're fixing sdk to DTRT with older nova too
15:51:02 mriedem api-paste is config and deployments can do whatever, even if it's dumb
15:51:05 mriedem see the comments in there about rax
15:51:49 efried stephenfin: I suppose with some extra hacking I could figure out a way to re-add the 302, but if it's not problematic to remove it, this is way simpler, less code, etc.
15:52:19 stephenfin gotcha
15:52:21 efried mriedem: that second novaclient blip should also continue to work fine.
15:52:22 mriedem i have no idea if external tooling things would rely on that 302 actually happening
15:52:32 efried yeah, that would be just... crazy I would think.
15:52:39 efried but it's what I'm asking.
15:52:47 efried Second thing:
15:53:19 efried Do we have any need to retain full compatibility for [api]auth_strategy=noauth2 in the wild?
15:55:22 efried I had to change NoAuthMiddleware a little bit because it used to be relying (hardcoded) on the auth_url being the versioned endpoint -- i.e. http://server:port/v2 or .../v2.1 -- because it would return that in the X-Server-Management-Url header.
15:55:40 efried But the whole point of the change was to make those URLs *not* go through auth middleware
15:56:35 efried so I had to make it so you use a different auth_url, and NoAuthMiddleware (still hardcoded) massages it appropriately so you still get the right X-Server-Management-Url header back.
15:57:27 mriedem noauth is for tests only
15:58:04 efried good, that's what I wanted to hear.
15:58:06 mriedem https://docs.openstack.org/nova/latest/configuration/config.html#api.auth_strategy
15:58:10 mriedem it's also in the config option help
15:58:42 efried Yeah, I just didn't know if the fact that we mention it in the conf help means we kinda have to support it and not break existing uses
15:59:05 efried Cool, so the last thing:
15:59:18 efried and this is obvious, because it's the point of the patch:
15:59:37 efried You no longer go through auth to get the versioned discovery documents
15:59:51 mriedem WHAT?!
16:00:09 efried I think it's possible this means there are some headers you used to get back that you wouldn't anymore.
16:02:11 efried We seem to have tests for things we care about, like Accept.
16:02:38 efried I suppose it would be duly diligent of me to go find out exactly what that diff looks like...
16:05:01 efried thanks for the talk mriedem mordred stephenfin
16:10:57 openstackgerrit Merged openstack/python-novaclient stable/train: Update TOX/UPPER_CONSTRAINTS_FILE for stable/train https://review.opendev.org/683626
16:11:00 openstackgerrit Merged openstack/python-novaclient master: Add release note for bug 1845322 https://review.opendev.org/685986
16:11:00 openstack bug 1845322 in python-novaclient train "'--hint' argument to 'nova boot ' should be a key-value pair" [Low,In progress] https://launchpad.net/bugs/1845322 - Assigned to Stephen Finucane (stephenfinucane)
16:12:33 openstackgerrit Matt Riedemann proposed openstack/nova master: Add Selection.availability_zone field https://review.opendev.org/685807
16:12:34 openstackgerrit Matt Riedemann proposed openstack/nova master: Handle get_host_availability_zone error during reschedule https://review.opendev.org/685997
16:12:35 openstackgerrit Matt Riedemann proposed openstack/nova master: Add functional regression test for bug 1781286 https://review.opendev.org/685998
16:12:35 openstack bug 1781286 in OpenStack Compute (nova) "CantStartEngineError in cell conductor during reschedule - get_host_availability_zone up-call" [Medium,Triaged] https://launchpad.net/bugs/1781286 - Assigned to Matt Riedemann (mriedem)
16:26:41 openstackgerrit Balazs Gibizer proposed openstack/nova master: Do not print default dicts during heal_allocations https://review.opendev.org/686001
16:29:45 gibi mriedem: finally ticked off this TODO as well ^^
16:32:02 mriedem ack, would be nice to see that in https://review.opendev.org/#/c/669879/ but i won't make you rebase it
16:32:23 mriedem maybe time to nudge efried and/or stephenfin to come back on ^
16:32:29 mriedem though stephen had comments
16:33:27 mriedem unrelated, while writing a resize reschedule test i realize that if we fail the resize claim we temporarily put the instance into ERROR state while rescheduling, and it will end up that way if rescheduling fails, which seems wrong b/c we didn't actually do anything with the guest, we just failed a claim
16:33:31 mriedem dansmith: agree? ^
16:34:15 dansmith agree with what? that leaving it in error state is wrong?
16:34:19 mriedem yeah
16:34:33 mriedem we should just fail the resize, mark the migration as error, inject a fault, etc
16:34:38 mriedem but the vm_state should still be active or stopped
16:35:50 dansmith I dunno, I guess I thought it was always a design goal that ERROR is your indication that something failed, and you start or stop the instance to get it back to normal state
16:36:26 mriedem that's a pretty big hammer for a user when resize fails b/c they lost a claim race
16:36:30 mriedem and the guest is otherwise untouched
16:36:38 mriedem the instance action will tell you as a user if the thing failed
16:36:42 dansmith isn't that why we can go from ACTIVE->ERROR->ACTIVE and the user can do the start operation from ERROR state?
16:36:57 gibi mriedem: ack, I will check back to the nova-next patch tomorrow
16:37:05 mriedem you can't start from error state
16:37:09 mriedem you can hard reboot
16:37:15 dansmith yeah, but you have to either poll it or something to know when to look right?
16:37:40 mriedem sure, poll until the task_state is reset to None
16:37:50 mriedem if the status is not what you expect, investigate the instance action
16:38:13 dansmith er, I really thought you could start to get out of error state
16:38:27 dansmith I had this long conversation with vish about it eons ago
16:38:36 dansmith although admittedly lots could have changed since then
16:38:42 mriedem hard reboot would do it but then you've hard to hard reboot your guest even though there is nothing wrong with it
16:38:48 mriedem *had to
16:38:58 dansmith no, I mean start or stop being a no-op from whatever real state it was in
16:39:06 efried mriedem: RC2 candidate, merged in master, wouldyouplease https://review.opendev.org/#/c/685742/
16:39:48 dansmith mriedem: well, stop works from error at least: https://github.com/openstack/nova/blob/master/nova/compute/api.py#L2401
16:40:00 efried and yes, on https://review.opendev.org/#/c/669879/ I'm waiting for stephenfin's questions to be answered.
16:40:44 mriedem dansmith: ok, but still, the user shouldn't have to stop and then start to get out of that, or hard reboot, when the thing that failed is a resize claim race
16:41:02 dansmith mriedem: so maybe it's just stop I'm thinking of.. anyway, I dunno.. it's very annoying as a user to do something, come back later and have it not obvious that the thing has happened, or failed or whatever
16:41:51 dansmith mriedem: if you're going to retry the operation for them, I agree. if you're not, then being super obvious about what has happened is best, IMHO
16:42:29 aspiers sean-k-mooney: got a response from AMD SEV guy
16:42:51 sean-k-mooney cool do we need to take acount of the qemu channels?
16:43:07 aspiers He didn't say so I'm following up explicitly on that
16:43:10 aspiers See my comment
16:43:25 aspiers https://review.opendev.org/#/c/684825/4/nova/virt/libvirt/designer.py@214
16:44:50 sean-k-mooney ok ya so we are missing the gpu supprot in the video model section
16:45:04 aspiers I'll add that now
16:45:38 sean-k-mooney and i think we do need the channels too since the channesl allow you to create virtio-serial deivces
16:46:15 sean-k-mooney a qemu channel has two parts a host backend and a guest front end
16:46:29 sean-k-mooney the guest front end is typeically a virtio-serial port
16:48:29 aspiers oops, the attribute for GuestVideo is 'type' not 'model'
16:48:59 sean-k-mooney we call it model in the image property
16:49:05 sean-k-mooney but maybe

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