Setting up OpenVPN with Docker in a public cloud

setup_openvpn.sh

# Install docker
yum check-update
curl -fsSL https://get.docker.com/ | sh
systemctl start docker
systemctl status docker
systemctl enable docker
systemctl status docker

# Set up the server-side of things

## Set up a Docker volume container
OVPN_DATA="ovpn-data"
SERVER_FQDN_OR_IP="your_server_name_or_public_ip"
docker run --name $OVPN_DATA -v /etc/openvpn busybox

## Set up the EasyRSA PKI certificate store
docker run --volumes-from $OVPN_DATA --rm kylemanna/openvpn ovpn_genconfig -u udp://$SERVER_FQDN_OR_IP:1194

## Generate a EasyRSA PKI certificate authority (CA)
docker run --volumes-from $OVPN_DATA --rm -it kylemanna/openvpn ovpn_initpki

## Start the server (Note: incoming udp traffic at port 1194 shall be allowed in the firewall settings)
docker run --volumes-from $OVPN_DATA --rm -p 1194:1194/udp --cap-add=NET_ADMIN kylemanna/openvpn

## Optional: To have the container running automatically at system start
docker run --volumes-from $OVPN_DATA -d --restart=always -p 1194:1194/udp --cap-add=NET_ADMIN kylemanna/openvpn

# Generate client config

CLIENTNAME=laptop
OVPN_DATA=ovpn-data
docker run --volumes-from $OVPN_DATA --rm -it kylemanna/openvpn easyrsa build-client-full $CLIENTNAME nopass
docker run --volumes-from $OVPN_DATA --rm kylemanna/openvpn ovpn_getclient $CLIENTNAME > $CLIENTNAME.ovpn

https://www.digitalocean.com/community/tutorials/how-to-install-and-use-docker-on-centos-7
https://www.digitalocean.com/community/tutorials/how-to-run-openvpn-in-a-docker-container-on-ubuntu-14-04
https://www.digitalocean.com/community/tutorials/how-to-set-up-an-openvpn-server-on-ubuntu-18-04

https://www.digitalocean.com/community/tutorials/how-to-set-up-and-configure-an-openvpn-server-on-centos-7#prerequisites