Numiptents Reaches Maximun Value

Aug 8, 2008

I'm using a Virtuozo - Plesk 8.6 based VPs. Since the first day I'm suffering hundreds of brute force ssh atacks. I decided to use BFD in combination with APF, and other security measures (thanks to the tutorial aboput securing VPS of this forum )

Since I installed APF, the value of numiptents reaches the maximum every few hours. The maximum value allowed in my vps is 256, and my provider says that he can not increase it (unless I upgrade to a more expensive plan ).

Is there any thing I can do to fix this problem? Perhaps an cron iptables flush every two hours or something like that?

What problems can I have when the numiptents value reachs the maximum?

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Apache :: Busy Servers Reaches Maxclients

Jun 18, 2015

I am using apache 2.2 webserver and tomcat 6 as app server.

I have two unix boxes (let say A and B) where apache is installed for load balancing purpose.

The issue is now and then I see that on both the server reaches to 250 busy servers which makes my site very slow and after some time the site is unaccessible.

When I see this I restart apache on both unix boxes and also restart my app server.

But that does not work. As soon as I start apache the httpd process ramps up to 12 (ps -ef | grep httpd) within a minute and the busy servers still remains at 250.

The only I have to do is wait and watch till the busy servers goes down to 250 and then site is back to normal.

Some times it takes hours for busy servers to go down below 250.

I dont understand that why even restarting apache and tomcat doesn't work. why the busy servers are still at 250. even after I restart.

This is what I have in httpd.conf

<IfModule worker.c>
ServerLimit 80
StartServers 2
MaxClients 250
MinSpareThreads 25
MaxSpareThreads 75
ThreadsPerChild 25
MaxRequestsPerChild 0
</IfModule>

I tried to increase MaxClients to 300, which also didn't work and apache or httpd process shuts down by itself.

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Is this a change with this version?

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