install virtualbox ubuntu 14 server phpvirtualbox

In case the container runs on the same host as your VirtualBox instance, you might be able to pass a -net=host option to the container and connect to localhost.If you're using a non-public DNS server, you may have to pass the -dns IP option to the container. You could also use some DDNS provider or custom scripts to update your DNS records. Many DHCP servers also offer options to act as an DNS server. This requires slightly more setup to configure your DNS setup. Note however that many DHCP server have an option to reserve certain IPs for given MACs, so your IP won't necessarily have to change.

This works reasonably well for static IPs, but less so for your DHCP setup. Indeed, the clue/vboxwebsrv image needs to be able to connect to the PC that runs VirtualBox via SSH. I haven't been able to an answer to that yet, but it's a docker question, not a docker-vboxwebsrv question. It looks like you can't reference localhost from inside a docker container - and the common answer is to use the hardcoded IP. The machine is using DHCP (it's actually a portable server that I take to customer sites) - so it won't ever have a hardcoded IP. Thanks for your elaborate description, this certainly helps troubleshooting this.

Install virtualbox ubuntu 14 server phpvirtualbox