Hi Guys,
I was using Nginx for the past few years and now switched to Apache 2.4 due to some compatibility reasons. I'm using Ubuntu 13.10 which ships Apache 2.4.6 by default. I have installed Apache and PHP using

apt-get install apache2
apt-get install php5 php5-mysql libapache2-mod-php5  

Site is working without a glitch and super responsive. But Apache spawns many processes and its eating my RAM. Its normal for Apache but my problem is I cant find Apache maxclients and other settings anywhere on Apache2.conf file which is located in /etc/apache2/apache2.conf . Tried putting these inside the file

<IfModule prefork.c>
StartServers X
MinSpareServers X
MaxSpareServers X
ServerLimit X
MaxClients X
MaxRequestsPerChild X
</IfModule>

Apache restarts successfully but it doesnt seems like Apache is obeying to these values. I spent a lot of time trying to find the issue but I couldn't. Please help

Thanks

First, verify which Apache multiprocessing module you are actually using with the following:

apache2ctl -M | grep -i mpm

If this is prefork, and assuming the configuration is somewhere under /etc/apache2/, the following command should show you where it belongs:

grep -Ri maxclients /etc/apache2/

Keep in mind this may indicate the file you edited (which is apparently not where it belongs) in addition to the correct one.

If you are using the worker or event MPM instead of prefork, your configuration will need to be different.

Also, bear in mind that 'MaxClients' has been renamed to 'MaxRequestWorkers', and 'MaxRequestsPerChild' has been renamed to 'MaxConnectionsPerChild' in 2.4 (the Apache documentation says the old names are still supported, but some configurations may require the new names):

http://httpd.apache.org/docs/current/upgrading.html (see 'Other configuration changes')

Thanks for the information. First command shows its prefork

root@XXXXXX:~# apache2ctl -M | grep -i mpm
 mpm_prefork_module (shared)

But the second command does nothing.

root@XXXX:~# grep -Ri maxclients /etc/apache2/
root@XXXX:~# 

"nicholasmark" mentioned that Maxclients settings has been changed on Apache 2.4 he is right

I tried

root@XXXX:~# grep -Ri MaxRequestWorkers /etc/apache2/

And it showed me that the configuration file for the prefork is in

/etc/apache2/mods-available/mpm_prefork.conf

I have found the settings on that file. Edited those and I think I'm good to go. Thanks both of you guys

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