MrGr33n

NOTE: if you run Eddie or Hummingbird you don't need this guide, but you might need to get rid of update-systemd-resolved which, in one of its various working modes, can interfere fatally with DNS handling.

This post describes how to accept OpenVPN servers DNS push on Linux, OpenBSD, FreeBSD and some other POSIX-compliant OS when:
resolvconf package OR openresolv package is installed OpenVPN is run directly (i.e. NOT through any OpenVPN GUI/wrapper such as network-manager) OpenVPN version is 2.1 or higher Warning: the specified "update-resolv-conf" script path refers to many Linux distributions and OpenVPN package installation, but NOT to all of them. Please check the correct path of the mentioned file before proceeding (for example: it could be /usr/share/openvpn instead of /etc/openvpn). If the script is not on your system, you'll need to create it. See the typical script here: https://wiki.archlinux.org/index.php/OpenVPN#DNS
 
Important: in the same above linked page, note that if you have a system based on systemd you might need some important modifications:
 
Add to your OpenVPN configuration file(s), either in field "Custom Directives" of the Configuration Generator or by editing the configuration directly, the following lines:
script-security 2 up /etc/openvpn/update-resolv-conf down /etc/openvpn/update-resolv-conf  
In this way update-resolv-conf will record the DNS push and through resolvconf or openresolv will modify the nameserver accordingly. When OpenVPN quits, update-resolv-conf restores the previous nameserver line(s).

Kind regards

Download your configuration file from the page Config Generator. If you don't already have the OpenVPN package installed in your system, you can tick Advanced Mode and tick Bundle executable (only for x86/amd64 based systems).
Have a look here to take care of DNS push (OpenVPN will not do that for you by default): https://airvpn.org/topic/9608-how-to-accept-dns-push-on-linux-systems-with-resolvconf/ Open a terminal console, reach the directory where you stored the files generated by the Configuration Generator and launchsudo openvpn foo.ovpnif you already have installed the OpenVPN package, orsudo ./openvpn foo.ovpnif you have downloaded our bundled executable. 
foo.ovpn is any *.ovpn files generated by the Config Generator. In the example we report "sudo" to run OpenVPN with root privileges. In some systems you might not have "sudo" available, or your account might be not included in the "sudo-ers". In these cases, you just need to run a terminal as root, or become root with "su" command.