DHE | I had something funky happen that was MTU-related since I'm using VXLAN and didn't set it up quite right initially. :) | 00:10 |
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DHE | connections would established from a TCP standpoint, but would then hang afterwards | 00:10 |
nsmeds | DHE: yeah, MTU is something we're investigating (no luck yet though) | 00:12 |
DHE | but is that your symptom? connection is established (netstat or whatever shows ESTABLISHED) but no data flowing? | 00:12 |
nsmeds | i'll go double check | 00:16 |
nsmeds | even 50% of SSH connection attempts to the instance's fail, es good times | 00:19 |
nsmeds | well isn't that interesting - even just running `netstat` hangs briefly half the time | 00:20 |
nsmeds | ah, probably due to DNS resolution (which fails half the time). Ok, i'll look into what you suggested | 00:22 |
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nsmeds | so still figuring out netstat, but here's an example. 10 dig requests for `google.ca` with 10 second timeout http://paste.openstack.org/show/740007/ | 00:40 |
nsmeds | half succeed instantly, half time out (never get response) | 00:41 |
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nsmeds | ah, so attempted to curl an IP, using netstat can see it stalls at `SYN_SENT` | 00:48 |
nsmeds | back to googling | 00:49 |
jenglisch | nsmeds: sounds like a duplicate ip problem to me | 00:51 |
nsmeds | jenglisch: right. Half of replies go to wrong IP and disappear, yes? That actually seems pretty reasonable | 00:53 |
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DHE | my suggestion was going to be some kind of LACP failure. if you have 2 links and one fails in strange ways, that could explain it | 01:21 |
DHE | but again this assumes network topology which I don't actually know about in your particular setup | 01:21 |
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nsmeds | DHE: ok, thanks. Setup as spine-and-leaf topology (two firewalls, three spines, and six leafs). Currently five compute servers, each with a connection to two leafs. Issue occurs on OS instance running on any of the five compute hosts. | 01:26 |
nsmeds | however, the issue is only on OS instances. The actual servers running in DC don't have any connection issues. | 01:26 |
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Haunted330 | This channel is closed and will reopen tomorrow at 8am CST. | 22:00 |
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Haunted330 | we're closed | 22:04 |
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