Easy way setup or install VPN OpenVPN on Ubuntu 20.04 ,I tested on my server. It work well.
1. Update your system
First, run the apt command to apply security updates:
sudo apt update sudo apt upgrade
2. Download and run openvpn-install.sh script
DOwnload installation script using short url as follow and update chmod :
wget https://git.io/vpn -O openvpn-ubuntu-install.sh chmod -v +x openvpn-ubuntu-install.sh sudo ./openvpn-ubuntu-install.sh
Select UDP (recomendded), Port default, DNS use 1.1.1.1 or Google, client name, just give some name for example client-vpn, then openvpn will generate file client-vpn.ovpn in the /root directory
3. Check status, start, stop or restart service
sudo systemctl status openvpn-server@server.service sudo systemctl start openvpn-server@server.service sudo systemctl stop openvpn-server@server.service sudo systemctl restart openvpn-server@server.service
4. Using opvn file
On Windows, install OpenVPN GUI and load client-vpn.ovpn file. From taskbar, right click OpenVPN icon and select appropriate vpn and click connect. OpenVPN will generate private/local IP addresses such as 10.8.0.1/32
5. Test/Verify connection
ping 10.8.0.1 #Ping to the OpenVPN server gateway ip route #Make sure routing setup working ## the following must return public IP address of OpenVPN server ## dig TXT +short o-o.myaddr.l.google.com @ns1.google.com
6. Add or remove a new VPN user with a certificate
You need to run the same script again for adding or removing a new VPN user to TLS certificate. For instance:
$ sudo ./openvpn-ubuntu-install.sh
This is summary from Ubuntu 20.04 LTS Set Up OpenVPN Server In 5 Minutes
https://gist.github.com/ebta/301f286fa9056d67e61bfc7cedd4ad56
