Apache using up all memory with no visitors on website
Try this answer over on Server Fault. This is definitely not a programming question.
https://serverfault.com/questions/408611/apache-httpd-process-utilizing-all-my-servers-memory
Apache 2.4 hits rlimit_nproc: hidden processes?
Found the problem thanks to the suggestion from @sarnold. My Application depends on mpm_prefork and up till Ubuntu 13.04, this module was automatically enabled when the apache2-mpm-prefork package is installed. I assumed this was still the case, but it turned out that it was running mpm_event.
It seems that in Apache 2.4 the packaging of MPM's has changed and mpm_prefork needs to be enabled manually after installation:
sudo a2dismod mpm_event
sudo a2enmod mpm_prefork
sudo service apache2 restart
Now the problems seem to have disappeared.
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