To install a custom module:
1. Download and unzip it into /var/cpanel/easy/apache/custom_opt_mods/.
2. When logged into your server as root, you can install any module listed below by running the following commands. Be sure to replace $NAME.tar.gz with the filename of the module you wish to download:
wget http://easyapache.cpanel.net/optmods/$NAME.tar.gz
tar -C /var/cpanel/easy/apache/custom_opt_mods -xzf $NAME.tar.gz
For example:
If you want to install mod_python
cd /var/cpanel/easy/apache/custom_opt_mods
wget http://twiki.cpanel.net/twiki/pub/EasyApache3/CustomMods/custom_opt_mod-mod_python.tar.gz
tar -C /var/cpanel/easy/apache/custom_opt_mods -xzf custom_opt_mod-mod_python.tar.gz
Reference : http://docs.cpanel.net/twiki/bin/view/EasyApache3/CustomMods