Thursday, 2015-01-15

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klindgrenSo - is anyone here happy with their rabbitmq configuration?  Do you have random issues (servers looking like their connected to rabbitmq - but actually not doing anything?) when restarting rabbitmq, or rebooting a hosting that rabbitmq is on or in general anything that would cause a failover?16:48
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mdormanain’t nobody happy with their rmq config :)16:51
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jlkhaha16:55
jlkwe're moving from rabbits behind HA proxy / ucarp to all rabbits listed in the openstack configs16:56
jlkto allow oslo to handle the clustering. No real data on how happy we are with that yet, it's rolled into our juno upgrade16:56
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mdormanjlk:  i’ve been thinking along the same lines.  it doesn’t seem like running rmq behind a vip really buys you anything.17:04
mdormanplus i think there is some rmq keep alive stuff in oslo now, or at least there was a push for that at some point17:05
_nickwe had no end of trouble with rabbitmq behind haproxy - it's a lot less problematic letting oslo handle it and with ha queues17:05
jlkyeah, unfortunately like others we have non-openstack services wanting ot use rabbit17:07
jlkfor those I'm not sure we can list multiple servers for them or if we'll have to continue down the VIP route17:07
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mdormanwell these are some good data points17:15
mdormani feel like every discussion around rmq at summit/meetups mostly just devolves to “rmq and/or oslo’s handling of it sucks!” and we never get to enough specifics to be useful.17:16
jlkI'm curious if anybody has given rabbit the finger and is using some other AMQP provider17:17
klindgrenyou mean qpid or 0mq?17:17
klindgrenI read some stuff about qpid not scaling a long time ago and most of those people said - we switched to rabbitmq and the issues went away17:18
klindgrenpretty sure omq is getting pulled out everywhere due to lack of use/maintenace17:18
klindgren0mq*17:18
jlkyeah, not sure trading erlang for java is we'd want to do17:18
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Ctina__We tried using qpid but had scaling issues so we quickly went back to rabbitmq17:27
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mgagnemdorman: thanks for sharing your experience with nova-cells ;)21:07
mdormanyeah, np, i hope it’s useful for people21:08
mdormanworking on moving our prod environment over this week and next, so hope to have some tidbits to add after that21:08
mgagnemdorman: I'm in the *exact* same boat and didn't know you were paddling next to me ;)21:11
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mdormannice21:16
mdormanso far i’ve spent all my time getting the rmq cluster expanded21:16
mdormanthe new server i have are cent7, existing ones cent6.  they had different versions of erlang so i couldn’t add the new ones into the existing rmq cluster21:17
mdormanso i had to uplift the cent6 boxes to cent7 first21:17
mdormannot a real fun exercise :)21:17
mgagnehaha, yes, rmq isn't always part of a success story21:17
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mdorman:)21:19
mgagnebtw, why can't you let nova-cells sync "up" the instances to the api cell? will it result in missing pieces?21:20
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mdormanthat’s what my experience was.  the only field it actually updated in the api cell was the instances.cell field.  everything else was just NULL21:27
mdormanwhich broke a bunch of stuff in the api cell.21:27
mdormanthat’s a good point, i should add that reasoning to the post21:27
mdormanmaybe there some some config or something i was missing, but that was the behavior i experienced21:28
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mgagnemdorman: alright, will have do to more experimentation because I was under the impression that you could spawn nova-api at the compute cell level, create instance in there and let nova-cells sync them up. (ok, you might have discrepancy in quota usage)21:33
mdormanyeah let me know if you figure out a way to make that work.  that’d simplify it quite a bit21:35
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dvorakklindgren_: we had pivotal in for 2 days recently to talk about rabbitmq, they strongly recommended running it through a load balancer23:41
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dvorakone thing we've talked about doing when doing rabbit restarts is to disable rabbit traffic into a specific node, then doing graceful restarts of everything that might be using it23:42
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mdormancurious why they highly recommended going through a LB?23:48
dvorakpart of it was that they said very few clients correctly handle connectiing to multiple hosts, or reconnecting to when connections fail with multiple hosts, or properly distributing traffic23:51
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dvorakbut a big part of it was that it makes it a lot easier to take one node offline before taking it down23:51
dvorakso you can disable new connections to the node and bleed them off over time23:51
mdormani see23:52
mdormanthat makes sense23:52
dvorakour experience with rabbit has been about the same as everyone elses23:52
mdormandef. seems like you hear about the same story from everybody23:52
dvoraka lot of our problems have been with unsynchronized queues, because we weren't manually syncing them after bringing a server back up23:52
dvorakand we don't have auto sync turned on (it's not the default)23:52
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dvorakand they didn't recommend turning on auto sync queues either23:53
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dvorakwhat I've proposed we do, and I'm not sure it's a good idea, is that when we need to restart a rabbit node, we disable it in the LB to disable any new connections to it23:54
dvorakthen for each node that has connections talking to it, take *that* out of the LB, restart all it's services, then move to the next23:54
dvorakwhich should allow us to bleed off all the rabbitmq connections without causing issues with dead connections that the clients dont' know about23:55
dvorakwhich is pretty horrible, but probably not actually too bad in practice if we automate it23:55
dvorakI've been doing a bunch of LB work this week as prep for our Juno upgrade that should make it easier to do that sort of thing later23:56
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dvorakhow far have you guys gotten on your juno upgrade?  Are you done?23:57
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