Thursday, 2016-02-25

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jlkHah, fuck it. Dropping TLS, going to use ssh instead.00:37
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dmsimardjlk: one of us, one of us :P02:03
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klindgren_jlk - whats the link to the libvirt bug? (sorry if I missed it - I got disco'd earlier)02:31
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xavpaiceoooh, same03:28
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tuurevHi, could you provide an opinion, as openstack does not have ipv6 floating IPs, how do You see, what would be the way to provide VIPs (service IP addrs) for IPv6 services?12:49
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jlkklindgren_: oh I haven't filed the bug yet.  I want to talk with the upstream dev first. It might just be a thing they never anticipated.15:59
jlktuurev: LBaaS15:59
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tuurevjlk: ack, currently it's just missing support for UDP :)16:46
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klindgren_what are you loadbalancing via udp?17:06
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klindgren_If dns/ntp highly suggest using anycast or something similar for that.17:07
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tuurevklindgren_: radius17:25
klindgren_kk17:26
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klindgren_mriedem, we added some stuff in there having someone else do some additions/clean up to the brain dump that I gave.18:47
mriedemklindgren_: i saw, thanks18:47
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klindgren_unsure if that was the info you were after or not18:48
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mdormanmriedem / klindgren_   finished my edits on that etherpad.20:29
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jlkAnybody using Ceph? Maybe in small clusters? Have performance issues with restarting the ceph osd services?21:50
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raginbajinYep.21:54
raginbajinjlk You are going to have a storm that will occur when the osd have to move all the pg's around.21:55
raginbajinSo the disks are going to be super busy and basically bring the system to a halt if you don't properly tweak values to ensure only a few osd's are worked on at a time21:55
jlkso I"ve just learned. Simply restarting the service is making things really shitty for 10~  minutes21:55
jlkseriously ceph, hav eyou not heard of a reload to re-read config file?21:55
jlkCOME ON.21:55
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raginbajinYou can do do live updates of the config file21:56
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raginbajinno need to restart to reload.21:56
raginbajinJust update the conf file, and then live update and be done21:56
jlkoh?21:57
jlkwhat's the live update?21:57
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raginbajinsomething like this ceph tell osd.* injectargs '--osd_backfill_scan_min 16 --osd_backfill_scan_max 32 --osd_recovery_op_priority 1'21:57
xavpaicejlk: we've had to do things like increase the allowable downtime for an OSD before it's marked as out - otherwise rebooting a box causes the same PG storm21:57
xavpaiceraginbajin: that's the approach we take too, and then make sure ceph.conf matches afterwards21:57
xavpaiceworks OK till we stuff it up21:57
jlkraginbajin: oh, that's just manually transposing config options into ceph commands21:58
jlkHOPE YOU GET THEM RIGHT21:58
raginbajinjlk yeah21:58
jlkI was hoping for something more built in21:58
raginbajinahh gotcha21:58
raginbajinyeah no such luck.21:59
xavpaiceceph osd reload... would be nice21:59
xavpaicethe smaller the cluster, the more potential pain - we started with only 3 hosts and a dead OSD would floor the entire cluster till it rebalanced21:59
raginbajinxavpaice definitely make things a lot nicer and less opportunity for wanting to jump off a cliff when I mess it up22:00
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raginbajinI really think getting going with ceph is actually really hard22:00
raginbajinThe whole stuff around osd_recovery_op, and the amount of pg's22:00
xavpaiceit looks so easy from the docs, then it gets hard in real life, real quick22:00
raginbajinand not very clear this is how you start with something of reasonable size and not just on your laptop.22:01
xavpaicesmall ceph clusters are an entirely different beast to the thousand node clusters22:01
raginbajinI'm afraid that I'll really mess up a bigger cluster if I can't manage a small one effectively..22:02
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raginbajinBut to give ceph its due, you can go a pretty long while before needing to mess with anything. It's almost set and forget.22:02
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xavpaiceit's recovered itself for a us a few times faster than we could have reacted, and customer uptime has been wonderful22:04
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