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| openstackgerrit | OpenStack Proposal Bot proposed openstack/ha-guide: Updated from openstack-manuals https://review.openstack.org/312418 | 09:58 |
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| moiz | hello everyone. Hope you guys had an amazing time at the Austin Summit :0 | 10:13 |
| moiz | * :) | 10:14 |
| moiz | i have a question | 10:14 |
| moiz | i am benchmarking the evacuations on different VM types and images. and have experienced that for a full OS i am experiencing greater downtime | 10:15 |
| moiz | for a 9G full centos 7 qcow2 image | 10:16 |
| moiz | the downtime is about 3 minutes | 10:16 |
| moiz | this time is due to the VM booting up at the new host | 10:17 |
| moiz | as when the OS is loading | 10:17 |
| moiz | seems like a dumb question (need clarification though), why does the VM rebuild ? shouldn't it be loaded at the last known state. and not booting up the VM from start. | 10:18 |
| aspiers | hi moiz, yes we did thanks :) | 10:18 |
| aspiers | moiz: it will rebuild unless you are using shared storage | 10:18 |
| aspiers | this is documented behaviour for nova evacuate | 10:18 |
| moiz | i am using shared storage | 10:21 |
| aspiers | then it won't rebuild | 10:22 |
| moiz | also using the flag too while evacuations --on-shared-storage | 10:22 |
| aspiers | I'm not sure what you mean by booting "from start" | 10:22 |
| aspiers | the VM is dead, so it has to be booted up | 10:22 |
| aspiers | this is unavoidable | 10:22 |
| aspiers | it's HA, not fault tolerance | 10:22 |
| moiz | i understand | 10:23 |
| moiz | what do you mean by "it will rebuild unless you are using shared storage" | 10:23 |
| moiz | shoudn't it rebuild eitherway | 10:24 |
| aspiers | rebuild from the image | 10:24 |
| moiz | oh got it | 10:24 |
| aspiers | no, if you are on shared storage then it will simply boot from the ephemeral disk | 10:24 |
| moiz | without shared storage: rebuild from disk and with shared storage: boot from disk | 10:25 |
| aspiers | right | 10:25 |
| moiz | without shared storage: rebuild from IMAGE** | 10:25 |
| moiz | sorry typo | 10:25 |
| aspiers | http://docs.openstack.org/admin-guide/cli_nova_evacuate.html | 10:25 |
| openstackgerrit | Merged openstack/ha-guide: Updated from openstack-manuals https://review.openstack.org/312418 | 10:26 |
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| moiz | aspiers: just verified it. thanks. don't know why i got this confusion in the first place. | 10:45 |
| moiz | Just to share one more update with you guys. while benchmarking i wrote a script that calls the evacuation manually, process is started when pacemaker_remote is detected as down, then scripts waits for nova to detect nova-compute as down and as soon as its down it will call the evacuation. | 10:48 |
| aspiers | Why did you do that? | 10:49 |
| moiz | the wait time (nova to detect compute node as down) is approx 60s (default for service_down_time = 60) | 10:49 |
| moiz | since the new api is not available for kilo (forcefully mark compute node as down). i reduced this time out to have an early detection | 10:51 |
| moiz | good question. a little bad hacky way to do evacs i guess. | 10:51 |
| moiz | just for proof of concept | 10:52 |
| aspiers | I see | 10:52 |
| moiz | i noticed that when you decrease this timeout below a certain value i start to get neutron port issues. | 10:52 |
| aspiers | when you try SUSE OpenStack Cloud 6, you will get Liberty, and the evacuation process automatically uses the mark host down API | 10:53 |
| moiz | and VMs start to go in error start while rebuilding. trying to attach a port that is already attached (in db) | 10:53 |
| moiz | yes i am starting SOC next week :) | 10:53 |
| aspiers | great :) | 10:54 |
| aspiers | maybe we can get you a copy of the appliance for easy install | 10:54 |
| moiz | sure. that would be great. | 10:54 |
| aspiers | vuntz_: can we arrange this? | 10:54 |
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| vuntz_ | aspiers: good question. I guess we can make it available somewhere, not sure where :/ | 11:23 |
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| aspiers | vuntz: can't Studio host this kind of thing? | 11:24 |
| aspiers | vuntz: or beta.suse.com? | 11:24 |
| aspiers | that's where we hosted the old Vagrant boxes | 11:24 |
| vuntz | aspiers: studio can't as it's not built there | 11:28 |
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| vuntz | I can ask for beta... | 11:29 |
| aspiers | vuntz: no need to ask, IIRC | 11:29 |
| vuntz | aspiers: I don't have any special right on beta.suse.com, do you? | 11:30 |
| aspiers | I just copied to euklid:/mirror/SuSE/beta.suse.com/stage/srv/httpd/htdocs/private/aspiers/ and waited 15 mins | 11:31 |
| vuntz | well, luck you to have a private space there :-) | 11:31 |
| vuntz | lucky | 11:31 |
| aspiers | oh yeah | 11:31 |
| aspiers | you have to ask for that I guess | 11:31 |
| aspiers | but we have SUSE-CLOUD there | 11:31 |
| aspiers | which I see you already have access to ... | 11:32 |
| vuntz | yeah, but that's for the cloud beta program, which is not public, so slightly different | 11:32 |
| aspiers | vuntz: there's nothing confining *all* the contents of that directory to the cloud beta program | 11:36 |
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