How to make and run up entry (or relay) node of tor on virtualbox with linux on usb ? Will it work same as node, installed and ran on usual computer (on host) with linux? Should I install and run up node same method as node on host? Thanks.
Yes it will work and it will be the same as running it directly on a laptop.
There are some caveats though:
Tor expects nodes to be stable. If you are regularly rebooting your laptop or VM or removing the USB, then this isn't a stable connection and the relay will never see much traffic.
A better option would be to just install Tor on a cheap dedication machine like a raspberry pi and just let it run without interruption.