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Posted to users@httpd.apache.org by da...@dan.tulsa.ok.us on 2006/02/08 07:11:27 UTC
[users@httpd] Why the sudden need to raise MaxClients?
We are using Apache 2.0.54 on Debian GNU/Linux (standard Debian
packages). The server had been running for several months with
absolutely no problems. A couple of days ago, Apache started slowing
down, then would eventually stop responding completely. The only way
to fix it was to restart Apache. It got to the point that Apache
would only stay functional for a few seconds at a time. Watching the
Apache logs revealed no unusual activity before the lockup.
I discovered the MaxClients setting, which in Debian defaults to 20
for the prefork MPM. I raised it to 100, and the problem went away. I
believe the default for this value is normally 256.
What would cause this problem all of the sudden? My first thought was
a DOS attack. Am I on the right track?
--df
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Re: [users@httpd] Why the sudden need to raise MaxClients?
Posted by ludi <my...@gmail.com>.
You can check /var/log/messege. If your kernel open the syn-cookie,
you will be notice when the dos happens.
2006/2/8, dan+apache-list@dan.tulsa.ok.us <da...@dan.tulsa.ok.us>:
> We are using Apache 2.0.54 on Debian GNU/Linux (standard Debian
> packages). The server had been running for several months with
> absolutely no problems. A couple of days ago, Apache started slowing
> down, then would eventually stop responding completely. The only way
> to fix it was to restart Apache. It got to the point that Apache
> would only stay functional for a few seconds at a time. Watching the
> Apache logs revealed no unusual activity before the lockup.
>
> I discovered the MaxClients setting, which in Debian defaults to 20
> for the prefork MPM. I raised it to 100, and the problem went away. I
> believe the default for this value is normally 256.
>
> What would cause this problem all of the sudden? My first thought was
> a DOS attack. Am I on the right track?
>
> --df
>
>
> ---------------------------------------------------------------------
> The official User-To-User support forum of the Apache HTTP Server Project.
> See <URL:http://httpd.apache.org/userslist.html> for more info.
> To unsubscribe, e-mail: users-unsubscribe@httpd.apache.org
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> For additional commands, e-mail: users-help@httpd.apache.org
>
>