Apache config for VPS with 2Gb Ram running nginx as a reverse proxy for static files

Apache tuning

My Apache config for a VPS with 2Gb Ram and the following:

* CentOS
* cPanel
* Apache 2.x (MPM Prefork)
* Nginx as a reverse proxy for static files (Nginx Admin cPanel plugin)
* APC, or eAccelerator for opcode caching
* One or multiple ExpressionEngine websites

min spare servers 2

max spare servers 5	
- should be roughly double min spare servers

start servers 2 
- should be same as min spare servers

server limit 50 
- 20Mb-30Mb per process so 50x30Mb=1500Mb, or 75% of available ram; go lower if your page loads use more memory.

max clients 50 
- same as server limit

max requests per child 500 
- ~10x the max clients. Ideally should be much higher (up to 5000) but experiment; higher means more chance of memory leaks.

KeepAlives Off
- on a VPS keep alives may cause the server to start swapping if it is hit with bursts of traffic 
  e.g. by an aggressive distributed web crawler. I'm looking at you 80legs.com.


Additional: 
* check your php.ini and set the lowest memory limit possible. Make it no more than 4x the typical page load.
memory_limit = 128M