I often use Openvpn to connect my servers toghter over several cloud servers provider.
This is my small how to for setting up the openvpn client.
yum install wget wget http://dl.fedoraproject.org/pub/epel/6/i386/epel-release-6-8.noarch.rpm rpm -Uvh epel-release-6-8.noarch.rpm yum install openvpn
Set up the Vpn client
In /etc/openvpn extract you vpn config
Save you openvpn config file as client.conf
Test you vpn
openvpn --config client.conf
Now when its working restart you openvpn with
/etc/init.d/openvpn restart
And now you will have vpn between you server.