Re: strange errors

Do you by any chance have netfilter running on your haproxy box? We had that at one point and were seeing that it would run out of slots in ip_conntrack. When that happened, I would see behaviors similar to what you're seeing.

On Dec 4, 2007 3:29 PM, Corin Langosch <corinl#gmx.de> wrote:

> Hi all!
>
> I run a medium php site with currently 10 web-servers and one haproxy.
> All webservers are dual or even dual dual-core servers. PHP5 accelerated
> with XCache. HAProxy shows about 100-200 req/s, which is not really a
> lot for the number of servers I think.
>
> Each php page normally takes only about 0.1s - 0.3s to generate, as
> stated in the html-code. My problem is that haproxy shows a lot of
> Resp-Errors and Retr-Warnings. Even worse some backend checks fail
> although these hit a static page! All webservers are always accessible
> trough their IP and show no overload in their extended status pages.
> Using top shows a load average of 0.5 - 2.0 (50% idle).
>
> Sometimes all servers get loaded up to their haproxy max limit for some
> seconds, but when I access the apache status page the servers are still
> almost idle.
>
> I really tried everything to find the errors, but I'm stuck. no entries
> in the syslog, no apache error logs. How can I track the errors down?
>
> I really appreciate any help on this strange behavior.
>
> Corin
>
>
>
Received on 2007/12/04 21:32