I HAVE COPIED THIS CODE AND ALL IMAGES FROM HERE FOR SIMPLE USAGE AND ACCESS

openvpn-installation

Find your public IP address

Use any one of the following command to find out your IPv4 public address. If your internface name is eth0 or eth1, enter:

$ ip addr show eth0 or $ ip addr show eth1

or use the host command or dig command as follows: $ host myip.opendns.com resolver1.opendns.com

or $ dig TXT +short o-o.myaddr.l.google.com @ns1.google.com

Run the bash file

$ sudo bash openvpn-install.sh

How to see added firewall rules ?

$ cat /etc/rc.local

Where to see openvpn server config file?

$ cat /etc/openvpn/server.conf

How to view connected users to open vpn server?

$ sudo cat /etc/openvpn/openvpn-status.log

How do I start/stop/restart OpenVPN server on Ubuntu Linux 16.04 LTS?

Type the following command stop the OpenVPN service: $ sudo systemctl stop openvpn@server

Type the following command start the OpenVPN service: $ sudo systemctl start openvpn@server

Type the following command restart the OpenVPN service: $ sudo systemctl restart openvpn@server

How do I start/stop/restart OpenVPN server on Ubuntu Linux 14.04 LTS?

Type the following command stop the OpenVPN service: $ sudo /etc/init.d/openvpn stop

Type the following command start the OpenVPN service: $ sudo /etc/init.d/openvpn start

Type the following command restart the OpenVPN service: $ sudo /etc/init.d/openvpn restart

Linux OpenVPN client configuration

First, install the openvpn client, enter: $ sudo yum install openvpn or $ sudo apt install openvpn

Next, copy xyz.ovpn as follows: $ sudo cp xyz.ovpn /etc/openvpn/client.conf

Test connectivity from the CLI: $ sudo openvpn --client --config /etc/openvpn/client.conf

Your Linux system will automatically connect when computer restart using /etc/init.d/openvpn script: $ sudo /etc/init.d/openvpn start

For systemd based system, use the following command: $ sudo systemctl start openvpn@client

How do I add a new client?

run the script again: $ sudo bash openvpn-install.sh then select option 1 and type client name

How do I delete/revoke existing user certificate?

Run the script: $ sudo bash openvpn-install.sh Type 2 option and you will see a list of all the existing client certificate you want to revoke.

REFERENCE

https://www.cyberciti.biz/faq/howto-setup-openvpn-server-on-ubuntu-linux-14-04-or-16-04-lts/