Sunday, 2012-07-29

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tixhello?!00:59
tixanybody around?!00:59
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WilliamHerryif use dhcpflat network, dnsmasq conf file looks like this01:40
WilliamHerryfa:16:3e:5f:44:07,sdfgsdfg.novalocal,192.168.11.20,net:NW-3801:40
WilliamHerrywhere sdfgsdfg stored in db, I change the one in instances table, it not affect01:41
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tixWilliamHerry: hi!02:04
WilliamHerrytix, hi02:05
tixwhat's up?02:05
mattuxhi02:05
tixwhen is openstack being released on the public cloud?02:05
tixon rackspace, i mean02:05
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uvirtbotNew bug: #1030430 in nova "qpid_heartbeat setting in ineffective" [Undecided,In progress] https://launchpad.net/bugs/103043003:26
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uvirtbotNew bug: #1030440 in openstack-common "keyring support for openstack client" [Undecided,New] https://launchpad.net/bugs/103044005:41
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uvirtbotNew bug: #994937 in openstack-manuals "Task: start documenting more ways to stop and start instances" [Medium,Confirmed] https://launchpad.net/bugs/99493707:41
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kermit666anyone knows why the "—hint force_hosts=hostname" flag for nova boot doesn't work? My VMs always seem to start on a random host. I'm using Essex and the simple scheduler.08:04
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cooljkermit666: does your user have admin role on the project? Looks like you need it: https://github.com/openstack/nova/blob/stable/essex/nova/compute/api.py#L34908:31
cooljkermit666: you should see lines like "Host filter fails for non-forced host" in nova-scheduler.log if it's working08:31
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kermit666coolj: My user is the admin, yes (I sourced /var/lib/nova/novarc), I also have --allow_admin_api=true in my nova.conf file. The only mention of filter in my /var/log/nova-scheduler.log is u'filter_properties': {u'scheduler_hints': {u'force_hosts': u'sleepy'}} (sleepy is the machine I'm trying to spawn the VM on, but it only sometimes actually does this); this file also says u'_context_is_admin': True and u'_context_roles': [u'admin']09:55
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kermit666I've reshared my question about forcing hosts using nova boot from earlier today on askubuntu, so if anyone wants to get points aside from helping me out can do that at http://askubuntu.com/q/165115/641813:01
kermit666sorry, wrong link. This is the correct one: http://askubuntu.com/q/169625/641813:02
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bigsky6n16:54
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swinchenWhy do you need to specify the network in nova.conf AND create/setup the network with nova-manager?  It seems like that is slightly rendundant.  Are the settings in nova.conf so the daemons know how to use the networks you create with nova-manage?17:25
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sdakewinchen right17:43
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sdakewinchen you  can also setup networks unrelated to the networks that nova executes rpc on17:44
swinchensdake: ok, so if I make changes I hanve to make them to both nova.conf and with nova-manage17:44
sdakethe nova.conf settings are for rpc17:44
sdakerpc cannot be dynamically configured17:44
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sdakenot saying it wouldn't be a useful feature, just that nobody has submitted a patch to do such a thing17:45
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nymoushello17:45
DiopterPatches welcome, etc17:46
swinchenMan, I really wish I knew more about networking.  I am will brb, I need to look up what rpc is :)17:46
sdakerpc is the communication layer between the openstack daemons17:46
nymouscan someone help me with live migration setup? i did everything from the docs, but nothing is working17:46
DiopterRemote Procedure Call. It's not a networking thing.17:46
sdakethey use "AMQP" via rabbitmq or qpid17:46
nymousi've tried virsh migrate --live and keep getting error: Network filter not found: Could not find filter 'nova-instance-instance-0000003a-fa163e191513'17:47
nymousdid i missed something?17:47
sdakethe openstack daemons are designed to run over specific networks for rpc (which are internal) vs the external networks you configured with nova-manage17:47
swinchenOh, so the network settings in nova.conf are passed to various services using RPC...?17:47
swinchen-passed +used17:47
sdakeits how the amqp services know which interface to bind to17:47
sdakefor example, yo ucould run compute in several places, and api in one place17:48
sdakein most setups you want that going over a segrated network from that of your vm traffic17:48
swinchenoh, thank you... I gotcha.  I could have potentially 3 or more networks... public network, RPC network, and a network that intances are on?17:48
sdakeyup thats right17:48
sdakemost devs just run on one network since they use a laptop for dev17:49
swinchenand in nova.conf I don't care about the public network, or the network for the VMs, JUST the RPC network...17:49
sdakemost/many atleast )17:49
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sdakei think there is a config option for the default floating ip network17:49
sdakesee; https://github.com/heat-api/heat/wiki/Configuring-Floating-IPs17:50
DiopterThere's several config options for networking in nova.conf17:50
DiopterMany of them have defaults17:50
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sdakediopter is correct winchen17:51
swinchenTHanks for the link.  I am wondering if I left out the floating ip section(s) in nova.conf, if I can just add them manually with nova-manage  hrmm17:52
DiopterYou'll want to nova-manage your floating IPs in general. They need to be in the database17:52
sdakeyup but if you dont set that public_network they will be assigned to a default (which is eth0)17:52
Diopternova.conf entries will only generally inform nova-network about iptables/ebtables rules.17:52
sdakesome distros dont use eth0 for the defualt interface17:52
swinchenOk, interesting.   I am really sorry about all these questions.  I am sure they are pretty simple.17:54
DiopterWell, yes and no17:55
sdakethat is what we are here for ;)17:55
DiopterTheres's 8972983752 combinations of flags and database and network and host setups17:55
DiopterOnce you settle on a use-case and infra, sure, then it's simple17:55
DiopterBut starting from ground zero... not so much :P17:55
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swinchenWell, I feel like I have tried half of those.  I had it working but I made some changes to the network and now I can't ping/ssh into my instances.  I really botched something good.17:56
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sdaketry restarting nova-network17:57
swinchensdake: I have unfortunately.  I have tried rebooting the whole machine.17:58
sdakeopenstack doesn't reread nova.conf without a restart17:58
sdakei see - well i'm out of ideas ;)17:58
sdakeand wife is calling to help her clean, gotta run17:58
sdakegood luck17:58
swinchenthanks17:58
sdakenp17:58
swinchenThank you for the help, I feel like I understand it a bit better at least.17:59
nymousno one ever did live migration?(18:00
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nymousi've noticed that whole filter tree should be synchronized between every node to be able to do live migration18:29
nymousbut i'm not sure if i missed an option to do so or what18:30
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uvirtbotNew bug: #1030586 in python-novaclient "novaclient contains non-openstack rackspace cloud specific code" [Undecided,In progress] https://launchpad.net/bugs/103058618:55
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nymouslive migration doesn't work with vnc options enabled19:31
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rogerlHi All,  Is there any way to get a swift proxy to use a particular storage server over the others?19:36
swifterdarrellrogerl: not that I know of; for GETs, each of the N replicas' object-servers are queries in series in shuffled order19:38
swifterdarrellrogerl: for PUTs, writes to all N replicas' object-servers are issued19:38
swifterdarrells/queries/queried/ in first line :)19:39
swifterdarrellrogerl: i'm curious what the use-case is that you're after19:39
rogerlThat is what I thought.19:39
swifterdarrellrogerl: are a subset of your storage nodes faster than the others?19:40
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crandquistare videos available from any of the openstack conferences ?19:40
rogerlI have a small setup at the moment .  4 zones spread across 3 data centers with 2 zones on one server and the 2, one in each dc.19:42
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rogerlswifterdarrell: the server with 2 zones should have a copy of everything but its proxy is retrieving from the other 2 zones instead.19:44
swifterdarrellrogerl: ah, gotcha; so the use-case is under the umbrella of geographically-disperse Swift clusers19:44
swifterdarrellrogerl: (where you need to worry about different path costs like that)19:45
rogerlswifterdarrell:  Yes.  seems like a lot of unnecessary traffic19:45
swifterdarrellare all the proxies in the DC w/2 zones?19:46
rogerlswifterdarrell:  some sort of zone weight or rtt on the proxy would be good.19:46
rogerlswifterdarrell:  no.  one in each dc.19:47
swifterdarrellrogerl: I know there's a lot of interest in more distributed Swift clusters, but I don't know of a single place where the use-cases are being fleshed out19:48
rogerlswifterdarrell:  It is a storage platform for video servers.  The servers retrieve the video from their local proxy.19:48
swifterdarrellrogerl: ...which might then pull from a different dc; ouch19:48
DiopterMaybe you could look into anycasting the IPs being used19:49
Diopterswift would be blind to it, so it's a bit subversive, but it might solve your problem a bit differently19:50
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rogerlswifterdarrell:  I haven't checked but I assume that PUTS are probably the same .19:51
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swifterdarrellDiopter: would anycasting require the IPs for the different storage-nodes to be the same?  If so, that may cause trouble with the ring (although you could use different ports per storage node?)19:52
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swifterdarrellrogerl: yup, the PUT will write to all N replicas, wherever they are19:52
Diopterswifterdarrell: Well, Some IPs would have to be the same. Potentially storage-nodes, possibly some other piece of the infra. I'm not that knowledgeable re: swift yet, so I'm not sure about the usefulness of anycasting.19:53
rogerlswifterdarrell:  That is not so much of a problem as there are a lot less PUTs than GETs19:54
swifterdarrellrogerl: *nod*19:54
swifterdarrellrogerl: and you have to contend w/cross-DC replication anyway19:54
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rogerlswifterdarrell:  That was one reason we looked at swift, because it could replicate across dc's easily.19:55
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swifterdarrellrogerl: hrm, there's a change coming which will make GETs asynchronously start to all N replicas and just serve the object using the first responder19:57
swifterdarrellrogerl: that could give you the result you're after for "free"19:57
swifterdarrellrogerl: as the local DC's server should generally cough up headers first, though I suppose that could be affected by load19:58
swifterdarrellrogerl: but it might get your local-hit probability > 1/replica_count19:58
swifterdarrellrogerl: that change was targeted at reducing worst-case latency for GETs when >= 1 replica can't be served up for some reason19:59
rogerlswifterdarrell:  That souns like it may just work :-)20:00
swifterdarrellrogerl: I'm not sure about the status of that change, but I think notmyname said it's ~50% done, but don't quote me on that20:00
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rogerlswifterdarrell:  The dcs are about 100ms apart so the local zone would have to be pretty busy not to respond first20:02
swifterdarrellrogerl: *nod*20:02
rogerlswifterdarrell:  Where can I get more info on that change?20:03
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swifterdarrellrogerl: I'll let notmyname know there's A) another person interested in the concurrent first-responder GET patch and B) that it helps with one of the distributed DC use-cases20:04
swifterdarrellrogerl: You can also email him directly at john at swiftstack d.o.t com and let him know you're interested20:05
rogerlswifterdarrell:  Will do.20:06
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rogerlswifterdarrell:  I have another question, regarding tuning.  Our usage has only a small number of accounts20:09
swifterdarrellrogerl: k20:12
rogerlswifterdarrell:  Is there any docs with setups for different usage scenarios?20:15
rogerlswifterdarrell:  I guess, ring setup, number of workers etc.20:16
swifterdarrellI know there's a pretty good general tuning guide20:16
swifterdarrellless sure about more specific tuning for more specialized workloads20:17
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swifterdarrellHaving a small number of accounts shouldn't matter too much w/the possible exception that updates will funnel metadata to the account-server, so with few accounts, those could be hot20:18
swifterdarrellbut if you've got a light-write workload that's mostly GETs, that won't matter20:18
rogerlswifterdarrell:  I sort of understand how the object servers work but I guess I need to get a better understanding on how the account & container servers work.20:19
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swifterdarrelleach account and container has an associated (sqlite) DB which holds info about it--things like names of objects within a container, names of containers w/in an account, byte counts20:20
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swifterdarrellthose DBs are replicated and protected in the cluster just like objects, though they each have their own ring so you can do things like put account/container storage on SSD drives which are only in the account/container rings and not the object ring20:21
swifterdarrellwhen you PUT an object, the object-server will update the object's container telling it about the object; if that fails for whatever reason, it'll get attempted again asynchronously20:23
swifterdarrellso writes into the cluster generate updates to the account/container DBs via their associated servers20:23
swifterdarrellso heavy write work-loads benefit from faster account/container storage (eg. SSDs)20:23
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swifterdarrellHere's the guide I was thinking of: http://tinyurl.com/d4te42f20:25
swifterdarrellthat page plus the next several pages down (in the left-hand-side TOC)20:25
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rogerlswifterdarrell:  So account/container are only databases so their storage requirements are tiny then, compared to the object storage.20:35
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swifterdarrellrogerl: yup20:35
uvirtbotNew bug: #1030609 in nova "Traceback when injecting data into the instance." [Undecided,New] https://launchpad.net/bugs/103060920:35
swifterdarrellrogerl: as an optimization for rotating-platter media, they are pre-allocated larger than their contents to avoid fragmentation20:36
swifterdarrellrogerl: but recently, this was made tunable because when storing them on SSDs, that's undesirable and unnecessary20:36
rogerlswifterdarrell:  I will keep that in mind for when we start adding hardware.  Will look at using ssd's for the accounts & containers.20:39
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rogerlswifterdarrell:  Thanks for all your help.20:39
swifterdarrellrogerl: no prob :)20:40
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swinchenhas anyone seen this error before (nova-manage floating list): 2012-07-29 17:44:43 CRITICAL nova [req-0b99ad5a-07a7-4c9a-bf70-ce40aca4adbd None None] (OperationalError) unable to open database file None None21:46
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swinchenerr, sorry.  :)  got it.21:48
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swinchenOk, serious question this time.   If I am trying to delete a network and there are no instances what could cause me to get the "NetworkInUse" error21:55
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swinchenhmm, maybe it has something to do with DHCP lease times22:06
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uvirtbotNew bug: #1030641 in horizon "Batch action messages should filter None from join()" [Medium,Confirmed] https://launchpad.net/bugs/103064122:51
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uvirtbotNew bug: #1030646 in horizon "Devstack vs. Horizon client versions" [Critical,Confirmed] https://launchpad.net/bugs/103064623:41
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