Monday, 2015-05-11

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mdormanmfisch:   i confess i’m a bit envious of the amount of superuser posts you get :)15:29
mfischmdorman: dont hate the player hate the game15:34
mfischI offered this time15:35
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mdormannah i think it’s cool15:37
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mfischmdorman: I'm going to miss your talk with my moderator duties15:46
mdormanthere’s always youtbue15:47
mdormani’m gonna miss a lot of the puppet work day for hte same reason15:47
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mgagneanyone with this bug? https://bugs.launchpad.net/neutron/+bug/132854616:50
openstackLaunchpad bug 1328546 in neutron "Race condition when hard rebooting instance" [Medium,Invalid] - Assigned to Li Ma (nick-ma-z)16:50
mgagnesomeone sais it got fixed in nova (no link to commit/change) but after looking at the code, I don't see any relevant fix16:50
mgagneand managed to reproduce the problem16:50
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mgagneNova calls ensure_bridge, finds that the bridge still exists, continue and then neutron agent removes it before the vif is added to it16:52
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mgagnejlk: ping17:35
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jlkmgagne: howdy17:40
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mgagnejlk: have you ever encounter the problem mentioned above?17:41
jlkmgagne: huh, not that I'm aware of17:41
mgagnedamn :-/17:41
jlkWe don't hard reboot all that often though17:41
mgagneif you hard-reboot an instance which is the only one using a network on the ocmpute node, you have a race condition where the agent will delete the bridge between the bridge creation (in nova) and the domain creation17:42
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jlkyeah, okay. We run into something very similar17:42
mgagneand tbh, I don't know how to fix it :-/17:42
jlksnapshotting a single instance on a HV will fail17:42
mgagneyep, same bug17:43
jlkbecause it'll take down the net17:43
jlkso yes, we do run into this17:43
mgagneand calling plug_vifs doesn't fix it17:43
jlklemme find hte bug and PR17:43
mgagnejlk https://bugs.launchpad.net/nova/+bug/1293540 ?17:43
openstackLaunchpad bug 1293540 in OpenStack Compute (nova) "nova should make sure the bridge exists before resuming a VM after an offline snapshot" [Low,Confirmed] - Assigned to Luo Gangyi (luogangyi)17:43
jlkthat's it17:44
jlkI even tagged it for backport17:44
mgagneyea, the change proposes adding a call to plug_vifs. the race is between that function (and ensure_bridge) and create_domain :-/17:44
jlksweeeet.17:45
mgagneso I'm not sure the change will fix it for real17:45
jlkperhaps not.17:45
jlkour current work around is to leave tiny instances on each HV17:45
mgagnehowever, I still don't understand why the race doesn't show up in create_domain17:45
mgagnedoesn't work well when each tenant has a private network17:45
jlkah, yeah17:46
mgagneso yea, I'm looking for ideas =)17:46
mgagneand there is no answer in #openstack-nova :/17:47
jlkouch17:51
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mgagneI think the workaround will be to remove the call to remove_empty_bridges and call it from a cron instead18:08
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jlkdo you run with delete namespaces ?18:13
jlkWe have it turned off, but considering turning it on again18:13
mgagneWe don't use namespaces afaik18:14
jlkah, okay.18:14
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