Vpn

To enable tun device in OpenVZ containers tun module - needs to be loaded in the host system (in my case CentOS 6.4) - containter (in my case Ubuntu Server 12.04) must be allowed to use tun

Depends on server configuration, each OpenVPN client needs configuration file (client.conf for *nix and client.ovpn for windows), certificate authority (ca.crt), [optional] tls auth file (ta.key), user crt and key.