Haproxy and other load-balancers and reverse-proxy can limit connections to
backends. As example (only 10 connections to backend):
global
maxconn 20000
...
frontend f_test
bind 127.0.0.1:80
acl test hdr_sub(host) test
use_backend b_test if test
...
backend b_test
# backend servers
server main 127.0.0.1:8080 maxconn 10
2010/11/6 Janine Ohmer <[email protected]>
> Another day, another problem. ;)
>
> This time it's a somewhat more recent (but still old) OpenACS site, that
> has always run under AOLserver 4.0.10. Overnight it got hit pretty hard by
> the Yahoo crawler, and it has stopped responding. Netstat shows 117
> connections, 78 in CLOSE_WAIT state and the rest in SYN_RECV.
>
> This site would hang up very occasionally on my old system; I would just
> restart it, since it didn't happen often enough to worry about. But it has
> only been running for about 16 hours, and that is way too soon to be doing
> this.
>
> The new system is more powerful than the old one, and runs a much newer 64
> bit Linux, vs a very old 32 bit one. It's entirely possible that my
> configuration (connections) is not ideal, but it hasn't changed so I would
> expect it to run at least as well on the new system as it did on the old.
>
> For now I will just restart it but I'm sure this will happen again. Any
> suggestions on how to troubleshoot? I have never had much luck over the
> years figuring this out; I usually just end up installing keepalive to
> restart, but that is really not ideal.
>
> thanks,
>
> janine
>
>
> --
> AOLserver - http://www.aolserver.com/
>
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>
--
Best regards, Alexey Pechnikov.
http://pechnikov.tel/
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