This will deploy a fully functional SoftEther VPN server as a docker image.
Source available on Git Hub.
docker pull yaronr/softether
Simplest version:
docker run -d --net host --name softether yaronr/softether
With external config file:
touch /etc/vpnserver/vpn_server.config
docker run -d -v /etc/vpnserver/vpn_server.config:/usr/local/vpnserver/vpn_server.config --net host --name softether yaronr/softether