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From: "Helmut Schneider" <jumper99@gmx.de>
Date: Sun, 15 Jan 2012 21:45:22 +0000 (UTC)
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Subject: [users@httpd] Re: MaxClients 256 but server-status show 1024 slots

Jeroen Geilman wrote:

> On 01/15/2012 08:13 PM, Helmut Schneider wrote:
> > Jeroen Geilman wrote:
> > 
> > > On 01/15/2012 08:01 PM, Helmut Schneider wrote:
> > > > Jeroen Geilman wrote:
> > > > 
> > > > > On 01/15/2012 07:31 PM, Helmut Schneider wrote:
> > > > [...]
> > > > > > So the highest value configured is 256 (setting at
> > > > > > server.conf.local overwrite defaults at apache2.conf). But
> > > > > > /server-status shows:
> > > > [...]
> > > > > > That's 1024 slots. And yes, I stopped and restarted apache
> > > > > > and even the server itself.
> > > > > > 
> > > > > > What's wrong here?
> > > > > > 
> > > > > > ~$ apache2 -v
> > > > > > Server version: Apache/2.2.14 (Ubuntu)
> > > > > > Server built:   Nov  3 2011 03:30:19
> > > > > > ~$
> > > > > Are you using worker or prefork ? What is serverlimit set to ?
> > > > Ah, I see. It is configured to use worker. Am I correct that I
> > > > need to adjust either ThreadsPerChild or ServerLimit (or
> > > > both)?! What is recommended? Both are currently unset/defaults.
> > > What is it you want to do ?
> > > Worker threads consume very little memory, the defaults are fine.
> > Check apache with nagios. I have a plugin that checks available
> > slots and when "MaxClients != open slots" Nagios thinks that
> > everything is fine while apache does not serve new clients anymore.
> 
> That would be a nagios bug, then.

No, it has nothing to do with nagios. The plugin just checks how many
slots are available counting the dots from /server-status while afaiu
MaxClients possibly limits them to a smaller value.


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