How to build a simple NixOS VM with VirtualBox.
Here's how you build my madematix VM:
I've used these instructions to build the core system of other dev VM's. Bear in mind these instructions are for VirtualBox running on a MacBook Pro Retina 15 so there may be things you should tweak if you run on a different host system: number of cores, RAM, screen resolution (HiDPI) and shared folders spring to mind...