From: http://openvpn.net/index.php/open-source/documentation/howto.html#pki
/etc/openvpn/easy-rsa/
# . ./vars
clients-name
:# ./build-key clients-name
/etc/openvpn/ccd/
if applicableca.crt
clients-name.crt
clients-name.key
client-confs/thoughtbit-client.conf
rc.openvpn
(for linux systems without an init script)