Friday, 2015-07-10

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mgagneanyone having trouble running cells with api cell with kilo and compute cell with juno? I'm getting all sort of errors00:55
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klindgrenDoes nayone here use PBR to get their version numbers for packages.  IE: python setupu.py --version or python setup.py egg_info and parse the versionn number from there?  IF so how are you dealing with the fact that newer versions of PBR >0.11 on handle 3 version numbers?  We generate 4 version number (w.x.y.z) tags where w.x.y is from upstream and .z means something specific to us.  PBR is forcing 3 version tags and the fo14:56
klindgrenurth number is always converted to .devZ14:56
klindgrenwith the new semver rules .devZ releases are to be evaluated lower than other releases (bascially all others).14:57
klindgren1.0.0.dev8 < 1.0.0.dev9 < 1.0.0.a1.dev3 < 1.0.0.a1 < 1.0.0.b2 < 1.0.0.c1 < 1.0.014:59
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klindgrensince upstream is currently releasing with 3 version tags - it basically gives us no room to tag and correctly version our own software.15:00
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mdormanmfisch:   you around?16:08
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jlkIf you haven't seen it, http://cube-drone.com/comics/c/alien-geometries17:18
klindgrenSeen it - but still funny17:24
klindgrenThe video of it being created was slightly interesting - his comments around it being this horribly complex diagram17:25
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mgagneAs anyone actually tested this "feature" ? https://review.openstack.org/#/c/98488/19:15
mgagneI found out that if you have any form of anti-spoofing enabled, having 2 vnics with IPs from the same subnet doesn't work. Linux will always reply to arp and requests using one of the interface and anti-spoofing will block the reply. Lets say you try to ping vnic #2, arp reply will be done through vnic #1 and will be blocked. If you disable the anti-spoofing, the traffic will always go through vnic #1 anyway.19:19
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klindgrenmgagne, we haven't but I think that can be fixed by in the os by setting the arp_announce and arp_ignore23:23
mgagneklindgren: in fact, there is no easy way to fix it in Linux according to SO answers I found23:24
mgagneklindgren: due to the way the tcp stack is coded in linux23:24
klindgreneven arp_announce=1 and arp_ignore=223:25
klindgren?23:25
mgagneI tried already =)23:25
mgagnehttp://serverfault.com/questions/415304/multiple-physical-interfaces-with-ips-on-the-same-subnet23:25
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klindgrenso that stopped arp from being dumb - but now you have routing stuff causing pain23:28
klindgrenwhats your use case around multiple nics on the same network? - curious23:30
klindgrenas I dont have an answer for how to solve it in nova.  Unless you find a way to make both of them share a common anti-spoofing rule setup23:31
mgagneklindgren: just testing the feature =)23:34
klindgrenmgagne, kk23:34
mgagneklindgren: but found out that it makes no sense23:34
klindgrendoes this also tie into neutron?23:35
mgagne?23:35
klindgrenif so you could always update allowed_address_pairs on neutron to permit the traffic from either nic23:35
klindgrenwas just looking at the doc impact: New neutron.allow_duplicate_networks configuration option23:36
mgagneit's in nova no?23:36
klindgrenit is - but if you are using neutron's security groups you could fix the anit-spoofing stuff23:36
klindgrento allow additional traffic23:37
mgagneyea but then, what's the point of all this =)23:37
klindgrenvia allowed_address_pairs23:37
mgagnetraffic will go through first interface anyway23:37
klindgrenallowing an instance23:37
klindgrento have multiple vnics on same network is useful for NfV service23:37
klindgreninstances and in that case this newly introduced nova flag should23:37
klindgrenbe set to True.23:37
mgagnebetter use floating IP if your purpose is to have more ips23:37
klindgrenI assume a NFv requrirement to hanve 2 uplinks23:38
klindgren*shrug*23:38
mgagneklindgren: could be that NFV boots other OS than linux which has better routing23:38
klindgrenpossible23:38
mgagneanyway =)23:38
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klindgreniirc windows has a model that works well for that use case23:38
klindgrenbut windows is deficient in networking pretty much anywhere else in my xp23:39
mgagne:D23:39
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