How to detach ssh from terminal without killing port forwarding?

Question

bash

There is a server that you need to work with via VNC, which looks at localhost.
To connect, I first forward port 5901 via ssh.
ssh [email protected] -L 5901:localhost:5901
You need to work as root (yes!), but before that, log in as user, and only then do su -.
The result is something like: The bottom line is that ssh remains attached to the terminal, but I do not need it. How to decide?
ssh [email protected] -L 5901:localhost:5901 -t 'su -'

Answer 1

1. screen if you want to do everything in one session
   
2. Start a -fseparate ssh session with the parameter (after reading in the manual how it works) to forward the port