Start a session under the `jupyterhub` account and then type :
```
nohup jupyterhub &
```
and logout.
## Having `jupyterhub` active concurrently with `docker` on `romeo`
By default `jupyterhub`'s proxy uses the port 8000 which the port used by `docker`'s. See below a way to have `jupyterhub`'s proxy using a different port ( e.g. 8500 ) :