| Posted | Nick | Remark | |
|---|---|---|---|
| #openstack-nova - 2021-06-03 | |||
| 08:49:11 | bauzas | I just remembered we have a --on-shared-storage flag https://docs.openstack.org/nova/latest/admin/evacuate.html#evacuate-a-single-instance | |
| 08:49:36 | bauzas | since evacuate is an admin action, op can use it | |
| 08:49:39 | bauzas | on purpose | |
| 08:50:51 | bauzas | so we already do the check automatically | |
| 08:50:52 | gibi | bauzas: onSharedStorage is deprecated in 2.13 | |
| 08:51:00 | gibi | bauzas: today we automatically detect it I guess | |
| 08:51:01 | bauzas | gibi: because we detect this ? | |
| 08:51:04 | bauzas | yeah | |
| 08:51:09 | gibi | "Starting since version 2.14, Nova automatically detects whether the server is on shared storage or not. Therefore this parameter was removed." | |
| 08:51:12 | gibi | yepp | |
| 08:51:20 | bauzas | ok, so I guess we can consider adding suspend | |
| 08:51:31 | gibi | suzhengwei: I suggest to propose a small spec about this. I'm happy to review it | |
| 08:51:44 | bauzas | if the target host is on shared storage, we could just try to boot with the suspended state | |
| 08:52:02 | bauzas | for paused, the implication would be that the evacuated instance would become active | |
| 08:52:15 | gibi | bauzas: active, or stopped | |
| 08:52:15 | bauzas | for suspend, too | |
| 08:52:20 | gibi | bauzas: we can decide | |
| 08:52:27 | bauzas | yup, that's the point | |
| 08:52:31 | gibi | bauzas: but true, it cannot be pasued any more | |
| 08:52:36 | gibi | paused | |
| 08:53:05 | gibi | I don't want to stop the discussion, but we have 8 minutes left. If there any other topic to discuss? | |
| 08:53:14 | gibi | /If/Is/ | |
| 08:53:24 | kashyap | bauzas: gibi: One last: | |
| 08:53:27 | gibi | kashyap: go | |
| 08:53:30 | suzhengwei | I think stopped is better. No matter pause or suspend, users can not acess the instance directly. | |
| 08:53:43 | gibi | suzhengwei: I can accept that | |
| 08:54:07 | kashyap | gibi: suzhengwei: On whether it makes sense of moving suspended instances between compute hosts, a thumb-rule can be: "follow the same rules for hardware matching as for a live migration between the hosts" | |
| 08:54:19 | kashyap | (I mean, to uncover any "gotchas") | |
| 08:54:47 | gibi | kashyap: ahh you have a point, this state can be hw dependent | |
| 08:54:49 | bauzas | kashyap: since evacuate is a rebuild, we can't predict this | |
| 08:54:49 | kashyap | FWIW, I also just checked the above w/ a QEMU migration developer; and he agrees. | |
| 08:55:25 | bauzas | gibi: sorry, I wasn't explicit but when I said 'we're gonna try to unsuspend from disk", I was thinking of hardware capabilities | |
| 08:55:28 | gibi | OK, then I propose not to try to recover the suspended state during evac. At list not in the first step | |
| 08:55:40 | kashyap | bauzas: gibi: Hm, so looks like this needs to be fleshed out in a design document | |
| 08:55:41 | gibi | /list/least/ | |
| 08:56:06 | bauzas | kashyap: the evacuate workflow is waaaaay different from live-migrate | |
| 08:56:16 | bauzas | you can't just check the source host at first ;) | |
| 08:56:27 | bauzas | and compare both | |
| 08:56:45 | bauzas | the scheduler is just giving you a target and then good luck with it | |
| 08:56:57 | kashyap | bauzas: I see; fair enough | |
| 08:57:03 | gibi | so in summary | |
| 08:57:04 | bauzas | but yeah, we're 4 mins | |
| 08:57:07 | gibi | so in summary | |
| 08:57:07 | bauzas | left | |
| 08:57:49 | gibi | suzhengwei: please propose a spec. I don't see any problem supporting evac for paused and suspended VMs. But they will lose the in memory or suspended state. They will be fresh VMs on the dest host in stopped state | |
| 08:58:18 | kashyap | Yeah; makes sense. | |
| 08:58:24 | suzhengwei | I will. | |
| 08:58:26 | kashyap | (On spec) | |
| 08:58:32 | gibi | suzhengwei: cool, thanks | |
| 08:58:48 | gibi | any last words before we stop the meeting? ;) | |
| 08:59:03 | suzhengwei | nothing from me. | |
| 08:59:07 | gibi | XinxinShen: ? | |
| 08:59:37 | XinxinShen | nothing for me. thanks. | |
| 08:59:56 | gibi | then thanks for joining. please continue discussion if needed | |
| 09:00:00 | gibi | I just stop the meeting log here | |
| 09:00:04 | gibi | #endmeeting | |
| 09:00:06 | opendevmeet | Meeting ended Thu Jun 3 09:00:04 2021 UTC. Information about MeetBot at http://wiki.debian.org/MeetBot . (v 0.1.4) | |
| 09:00:07 | opendevmeet | Minutes: http://eavesdrop.openstack.org/meetings/nova_extra/2021/nova_extra.2021-06-03-08.00.html | |
| 09:00:08 | opendevmeet | Minutes (text): http://eavesdrop.openstack.org/meetings/nova_extra/2021/nova_extra.2021-06-03-08.00.txt | |
| 09:00:09 | opendevmeet | Log: http://eavesdrop.openstack.org/meetings/nova_extra/2021/nova_extra.2021-06-03-08.00.log.html | |
| 09:00:23 | bauzas | right on time | |
| 09:02:59 | kashyap | gibi: Remind me again, what's the case against trying to "resume" the saved state on the destination, instead of a fresh rebuild (which loses the state)? Because it also involves dealing with the state file transportation? | |
| 09:03:31 | gibi | kashyap: if we need to take care of HW compatibility then we have to blow up the evac process | |
| 09:03:46 | kashyap | gibi: Oh, yikes; yes. How come I forgot so quickly | |
| 09:03:59 | gibi | live migration is special :) | |
| 09:04:17 | kashyap | Tell me all about it. | |
| 09:04:23 | gibi | :D | |
| 09:05:04 | kashyap | gibi: I'm not the person for GIFs, but this captures it: https://kashyapc.fedorapeople.org/Live-Migration.gif | |
| 09:05:42 | kashyap | (Not sure if it's loading correctly for you) | |
| 09:06:02 | gibi | ooh, that is good | |
| 09:06:10 | gibi | I will distribute it :) | |
| 09:06:17 | kashyap | You're welcome ;-) | |
| 09:06:28 | gibi | thanks | |
| 09:06:34 | kashyap | gibi: Does it load smoothly for you? For me not here, strangely | |
| 09:06:43 | gibi | it works for me from firefox | |
| 09:06:54 | gibi | smooth and on auto repeat | |
| 09:07:13 | kashyap | Ah, nod. (It goes in super slow-motion on FF and Chromium.) | |
| 09:10:13 | bauzas | gibi: I think we have a formal contract with evacuate | |
| 09:10:28 | bauzas | gibi: this is badly named as it's a recreate | |
| 09:10:43 | bauzas | if you really want to have persisted storage, use volumes | |
| 09:11:12 | bauzas | because if not, we'll recreate the instance, even on shared storage | |
| 09:12:54 | gibi | yeah, we should just drop evac and change rebuild to detect if the compute is dead and then rebuild the instance on anther host. (partly joking) | |
| 09:13:47 | bauzas | gibi: and chicken will have teeth | |
| 09:14:34 | gibi | OK, I guess this is some French saying :) | |
| 09:14:36 | bauzas | but yeah, this extra API action is confusing | |
| 09:14:45 | bauzas | and the wording is horrible | |
| 09:15:43 | bauzas | gibi: for your european culture https://blogs.transparent.com/french/when-pigs-fly-and-chicken-have-teeth-impossible-french-expressions/ | |
| 09:16:21 | gibi | thank you | |
| 09:16:30 | jchorin | Hi everyone! I would like to enable TLS for my nova service, setting the `cert` and `key` parameter in nova.conf did not seem to have any effect on the nova-api. Is there a right way to do it? | |
| 09:16:34 | bauzas | gibi: I guess you probably have other expressions like this in your own language | |
| 09:18:39 | bauzas | either way, dropping for a few | |
| 09:19:53 | gibi | Ok for me this chikent thing would be : "when red snow falls (... with black dots) " | |
| 09:21:38 | gibi | which was OK in my childhood, but recently we got sand from Sahara sometimes and that can make the rain red, so I can imagine that we can get red snow in the same way | |
| 09:46:06 | bauzas | gibi: indeed, when you live close to the mountains, you see red snow ;) | |
| 09:46:21 | bauzas | actually, more likely orange snow | |
| 09:46:51 | gibi | yeah it is orange-red rain that happens here | |
| 09:47:06 | gibi | it makes everything dirty :/ | |
| 09:47:53 | bauzas | gibi: https://photos.app.goo.gl/nCCAirhi8sZ3vDyc9 some pic from last winter ;) | |
| 09:48:38 | gibi | It looks like it made with a sepia filter :) | |
| 09:48:59 | bauzas | indeed, but no, just a regular pic ;) | |