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I've just installed Apache 2.4.7 (Ubuntu) on my Ubuntu 14.04 LTS system and can't see neither prefork nor worker settings in the /etc/apache2/apache2.conf. They are also not defined for default virtual host. Should I set them myself in apache2.conf like this?

<IfModule mpm_prefork_module>
    StartServers 2
    MinSpareServers 2
    MaxSpareServers 5
    MaxClients 200 #must be customized
    ServerLimit 200 #must be customized
    MaxRequestsPerChild 100
</IfModule>
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2 Answers 2

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Ubuntu 14 organizes all the module-specific configs in separate files under /etc/apache2/mods-available/, so the MPM prefork stuff is now located in /etc/apache2/mods-available/mpm_prefork.conf

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Have you looked for these settings within /etc/apache2/conf.d/? It's likely that these settings are kept in separate included files to aid with packaging.

Should I set them myself in apache2.conf like this?

<IfModule mpm_prefork_module>
    StartServers 2
    MinSpareServers 2
    MaxSpareServers 5
    MaxClients 200 #must be customized
    ServerLimit 200 #must be customized
    MaxRequestsPerChild 100
</IfModule>

Yes, you can place them in apache2.conf (though do look for them in other files in conf.d/ as mentioned above).

Your MaxRequestsPerChild seems very low - this can be in the thousands.

If you are running mod_php your MaxClients should be lowered significantly, unless you have many gigs of RAM.

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  • Thanks for your answer. My installation of Apache doesn't have conf.d at the /etc/apache2/. How is that possible?
    – Max Koretskyi
    Jun 25, 2014 at 13:36
  • Sorry, that is what I get for writing this answer without testing on 14.04. I only have 12.04. Either they have changed the conf dirs for apache or something else is going on :)
    – thomasrutter
    Jun 25, 2014 at 13:44
  • OK, we will wait for someone to clarify the matter :). Can you please elaborate on this Your MaxRequestsPerChild seems very low - this can be in the thousands. If you are running mod_php your MaxClients should be lowered significantly, unless you have many gigs of RAM. ?
    – Max Koretskyi
    Jun 25, 2014 at 13:47
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    The default MaxRequestsPerChild is 10000 which means a process will only be restarted once every 10,000 requests per process. Dropping this to 100 seems like it would only harm performance unless you're experiencing a specific problem such as a bad memory leak. And for MaxClients, with mod_php you may need to lower this from its default because each process is so large - unless you have many Gigabytes of RAM.
    – thomasrutter
    Jun 26, 2014 at 0:46

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