VirtualBox

VirtualBox Headless

Using virtualbox machines headless. Useful when you run your images on a remote server or even a localserver without graphical UI.

VBoxManage list vms 
VBoxHeadless -s servername 
VBoxManage startvm servername --type headless

These days I mostly use docker or k8s but for some stuff ( low level or to test linux distributions ) I prefer the old style vms ;)