| aspiers | beekhof_mb: remind me why you split fence_evacuate out of fence_compute? | 00:00 |
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| beekhof_mb | aspiers: because they're two very different things | 00:27 |
| beekhof_mb | aspiers: and it allows for much better error handling | 00:27 |
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| beekhof_mb | in both | 00:28 |
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| aspiers | beekhof_mb: I'm definitely not against it, and very likely in favour, just trying to understand better | 11:10 |
| beekhof_mb | didnt we already have it as two separate boxes in your diagrams? | 11:11 |
| aspiers | beekhof_mb: so NovaCompute / nova-compute-wait only call fence_compute, but NovaEvacuate calls fence_evacuate if it's available or fence_compute otherwise | 11:12 |
| aspiers | right? | 11:12 |
| beekhof_mb | makes it easier to swap fence_evacuate out for whatever the green box will be | 11:12 |
| aspiers | I can't remember :) | 11:12 |
| beekhof_mb | we dont have nova-compute-wait | 11:12 |
| * aspiers looks at the diagram | 11:12 | |
| aspiers | oh, you dropped that? | 11:12 |
| beekhof_mb | long time ago | 11:12 |
| aspiers | the fence_evacuate in that diagram was the one ddeja wrote for talking to mistral | 11:13 |
| aspiers | https://aspiers.github.io/openstack-day-israel-2017-compute-ha/#/nova-host-alerter | 11:13 |
| aspiers | that's completely different to your fence_evacuate | 11:14 |
| beekhof_mb | in any case, two agents makes it easy to trigger something that isn't as dumb as our current fence_evacuate | 11:14 |
| beekhof_mb | while keeping the important bits | 11:14 |
| aspiers | hrm, it seems the diagram is missing an arrow from NovaCompute to fence_compute :-/ | 11:15 |
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| aspiers | I'm pretty sure I'm still missing one key piece of architectural logic | 11:15 |
| * aspiers waits for the penny to drop | 11:15 | |
| beekhof_mb | for us its not fence_evacuate but right | 11:15 |
| beekhof_mb | ok | 11:15 |
| beekhof_mb | so in that diagram you have fence_evacuate and fence_compute | 11:16 |
| beekhof_mb | one is red. the other yellow | 11:16 |
| aspiers | right | 11:16 |
| beekhof_mb | much easier to retire the red one if its not in the same file as the yellow one. no? | 11:16 |
| aspiers | yes, but it never was in the same file | 11:17 |
| beekhof_mb | yes it was | 11:17 |
| aspiers | https://github.com/gryf/mistral-evacuate/blob/master/fence_evacuate.py | 11:17 |
| aspiers | it was that one | 11:17 |
| aspiers | entirely different thing | 11:17 |
| aspiers | only talks to mistral | 11:17 |
| beekhof_mb | and much easier to swap in a mitral talking fence_evacuate for our shit nova one if its not in the same file as fence_compute | 11:17 |
| beekhof_mb | s/mistral/whatever/ | 11:18 |
| beekhof_mb | the concept is the same though | 11:18 |
| aspiers | is it? | 11:18 |
| beekhof_mb | an agent that actually does the evacuation | 11:18 |
| beekhof_mb | or triggers it | 11:18 |
| beekhof_mb | it should not be in the same agent/file that is making nova safe before the evac can be performed | 11:19 |
| aspiers | well, the mechanism for choosing a different evac method was supposed to be nova-host-alerter | 11:19 |
| beekhof_mb | fence_compute <-- make nova safe | 11:19 |
| aspiers | but yes I agree on the value of separation, absolutely | 11:19 |
| beekhof_mb | sure, so s/fence_evacuate/nova-host-alerter/ in the future | 11:20 |
| aspiers | OK, think I got it now | 11:20 |
| aspiers | ... in a woolly Tuesday morning without coffee sort of way :) | 11:21 |
| beekhof_mb | :) | 11:21 |
| beekhof_mb | before, fence_compute == make nova safe + trigger evacuation | 11:21 |
| beekhof_mb | before, fence_compute == make nova safe + trigger evacuation in a very specific way | 11:21 |
| beekhof_mb | and we want that way to change | 11:21 |
| beekhof_mb | so pull out that bit so we can ditch it more easily later and still keep the generically useful bit | 11:22 |
| aspiers | by "make nova safe" you mean fence + mark host down, right? | 11:22 |
| beekhof_mb | power fence happens elsewhere | 11:22 |
| beekhof_mb | but yes, mark down and disable | 11:22 |
| aspiers | ah yeah, of course | 11:22 |
| beekhof_mb | btw. https://github.com/beekhof/galera-operator/blob/master/apps/galera/deployment.yaml | 11:22 |
| aspiers | multi-level fencing | 11:22 |
| beekhof_mb | galera managed natively in k8 | 11:23 |
| beekhof_mb | i'll announce in due course | 11:23 |
| aspiers | oh, well done :) | 11:23 |
| aspiers | you've been working on that a while now | 11:23 |
| beekhof_mb | thinking about it for a while | 11:23 |
| beekhof_mb | working only recently | 11:23 |
| aspiers | "ReplicatedStatefulSet" huh | 11:23 |
| aspiers | interesting | 11:23 |
| beekhof_mb | least worst name i could come up with | 11:24 |
| beekhof_mb | short form... rss :) | 11:24 |
| aspiers | haha nooooo | 11:25 |
| aspiers | that's taken already :) | 11:25 |
| aspiers | guessing you're not coming to Dublin? | 11:25 |
| beekhof_mb | nope | 11:25 |
| aspiers | but probably Vancouver? | 11:25 |
| beekhof_mb | and yes, i'm aware its in use outside of k8 | 11:25 |
| beekhof_mb | unlikely but stranger things have happened | 11:26 |
| aspiers | otp | 11:28 |
| beekhof_mb | otp? | 11:35 |
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| aspiers | on the phone | 11:57 |
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| openstackgerrit | Merged openstack/openstack-resource-agents master: NovaEvacuate: Correctly handle stopped hypervisors https://review.openstack.org/428076 | 13:51 |
| openstackgerrit | Merged openstack/openstack-resource-agents master: NovaEvacuate: Support the new split-out IHA fence agents with backwards compatibility https://review.openstack.org/503617 | 13:51 |
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| openstackgerrit | Merged openstack/openstack-resource-agents master: neutron-ha-tool: do not replicate dhcp https://review.openstack.org/463320 | 13:53 |
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| openstackgerrit | Merged openstack/openstack-resource-agents master: NovaEvacuate: Allow debug logging to be turned on easily https://review.openstack.org/334737 | 15:32 |
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