I have a problem on 2 new low load (only 1 testsite per server) Ubuntu 12.04 servers (Perfect Server Setup). After a few days I get a max clients error and after that Apache crashes. My current settings: <IfModule mpm_prefork_module> StartServers 3 MinSpareServers 3 MaxSpareServers 10 MaxClients 150 MaxRequestsPerChild 3000 </IfModule> When I have higher settings here Apache crashes after a day. The rest of the system is fully responsive. After the crash I checked the running processes and I see a lot of "/usr/sbin/apache2 -k start" lines. It looks like the processes are not closed/terminated and endless processes are created. Can that be the cause for the Apache crash? What can I do about it?