[Xen-users] tcp connections bewteen domUs woes

To:	xen-users@xxxxxxxxxxxxxxxxxxx
Subject:	[Xen-users] tcp connections bewteen domUs woes
From:	Thomas <iamkenzo@xxxxxxxxx>
Date:	Wed, 22 Jul 2009 17:50:07 +0200
Delivery-date:	Wed, 22 Jul 2009 08:50:54 -0700
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Hi,

I have 2 domUs communicating between, each other. One has Nginx
running that processes all incoming requests, if it's a static file,
it serves it directly, if it's a dynamic request, it then proxy_pass
the request to a Rails app hosted on another domU. For a few days now,
I am experiencing some problems between these 2 domUs. Here is a
picture of the problem:

$ netstat -anp
Proto Recv-Q Send-Q Local Address           Foreign Address
State       PID/Program name
[...]
tcp     1239      0 10.0.0.2:3100           10.0.0.1:36186 CLOSE_WAIT -
tcp        1      0 10.0.0.2:3100           10.0.0.1:48261 CLOSE_WAIT -
tcp     1107      0 10.0.0.2:3100           10.0.0.1:48286 CLOSE_WAIT -
tcp     1239      0 10.0.0.2:3100           10.0.0.1:36192 CLOSE_WAIT -
tcp     1152      0 10.0.0.2:3100           10.0.0.1:36189 CLOSE_WAIT -
tcp     1152      0 10.0.0.2:3100           10.0.0.1:36195 CLOSE_WAIT
[...]

Connection never close and will keep adding. At some point in time all
running processes of my Rails app will get stuck and my application
will become unreachable. Any idea where that could come from?

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[Xen-users] tcp connections bewteen domUs woes