I want to set up a LEMP server specifically for XenForo. I'm using this guide as a starting point because it seems to cover the basics and installs the packages from repos that will be easy to keep updated. It includes the following: PHP 5.5 Percona for mysql Postfix (I'm planning on using exim instead) Nginx While keeping things simple (and please try to explain in very simple terms) what would you change? I gather that APC should be there, how would this be added?. Should some of the other php options be changed?