Michael Biebl wrote:
Hi,
first of all, I'd like to say hi, as I'm new to the list.
I hope you can help me with the following problem I have.
I run a stock Debian lenny installation with apache 2.2.9 and tomcat 6.0.18
I'm using mod_proxy to forward the request to tomcat using ajp. The
apache vhost configuration looks like this:
<VirtualHost *:80>
...
ProxyRequests Off
ProxyVia On
ProxyPass /t/ ajp://localhost:8009/barcooServer/t/
ProxyPass /ws/ ajp://localhost:8009/barcooServer/ws/
ProxyPass /reports/ ajp://localhost:8009/barcooServer/reports/
ProxyPass / ajp://localhost:8009/barcooWebsite/
ProxyPassReverse / ajp://localhost:8009/barcooWebsite/
ProxyPassReverseCookiePath /barcooWebsite /
...
</VirtualHost>
The apache mpm prefork modules is used with the following configuration.
<IfModule mpm_prefork_module>
StartServers 5
MinSpareServers 5
MaxSpareServers 10
MaxClients 200
MaxRequestsPerChild 0
</IfModule>
The tomcat ajp connector configuration is as simple as
<Connector port="8009" protocol="AJP/1.3" redirectPort="8443" />
Now, when I get a lot of users access, the http connection via apache
slows down to a crawl
and I get a lot of the following messages in the kernel log:
[2350915.113736] __ratelimit: 11 messages suppressed
[2350915.113742] TCPv6: Possible SYN flooding on port 8009. Dropping request.
apache and tomcat itself seem to be idling along, and the load is not
that high on the machine.
Has anyone an idea what's going on there?
It seems to be something entorely outside of Apache and Tomcat.
I'm no specialist, but a few names come to mind : iptables, denyhosts,
SELinux ?
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