Re: [users@httpd] Denial of Service?

[matt farey <ma...@gmail.com>]

Reto Baumann wrote:
> Hi all
>
> I'm dealing with a new problem for me. I'm running an Apache web server with 
> PHP and a MySQL database backend. The apps are doing fine so far and up until 
> recently everything worked just fine.
>
> About a few days ago, a strange phenomenon started. I normally have around 20-
> 50 Apache processes running. I now see the number of processes jumping up to 
> 400 within minutes. The MaxClients set to 400 and the Apache is stopping to 
> respond - the users can't access the page anymore.
>
> I'm using Apache httpd server version 2.0.59 and PHP 4.4.6. 
>
> httpd.conf says:
>  KeepAlice On
>  MaxKeepAliveRequests 10
>  KeepAliveTimeout 10
>  MinSpareServers 5
>  MaxSpareServers 10
>  StartServers 5
>  ServerLimit 500
>  MaxClients 400
>  MaxRequestsPerChild 500
>
> When I check with 'netstat -an' on my Linux box I see lets of "TIME_WAIT" 
> connections. Might this have to do something with the problem?
>
> Any ideas or approaches on how to figure out what might cause the problem? Am I 
> dealing with some sort of DoS?
>
> thx for the help
> reto
>
>
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>   
Can you Coralize the URLs for some/all of the affected content? (Coral
Distribution Network) can be useful to mitigate DoS or slashdott effect.

-- 
Matthew Farey



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