Re: Reestablishing ssh connections via screen

[John Davidorff Pell]

On 22 Jun 2005, at 10:58, JCA wrote:
> > JCA wrote:
> >
> > >   I have a Linux notebook that connects to a Linux server by ssh.  
> > > The
> > > notebook can be suspended to disk at any time, while ssh sessions to
> > > the server are still running. How can screen be used so that,  
> > > when the
> > > notebook is brought back from its dormant state, whatever ssh  
> > > sessions
> > > it had active with the server, at the time the notebook was put to
> > > sleep, are automatically re-established?
> >
> > I dunno how you would set up your laptop to do this, but all that's
> > really needed is for you to ssh back to every computer you had
> > previously connected to (however, the connections might just still be
> > alive when you wake) and run "screen -r" on each host.  This will
> > reconnect to detached screen sessions.
>
>    Hmm.... I am confused. Do I run screen both on the notebook and the
> server, or only on the notebook? Also, if the ssh session has been
> terminated by the server, how can screen reconnect it? Notice that I
> want to reconnect to exactly the same session I had, inside which I
> might have been running at the time some other application, like, say,
> an editor. Can screen really do this?

Screen runs only on the server. You ssh from your laptop to the  
server, and run the program `screen'. This program then runs a shell  
under it. You disconnect. When you disconnect, screen does NOT quit,  
it keeps running. Later, you reconnect from your laptop to the  
server. You run the program `screen' again, but this time you add '- 
r' (`screen -r'). You now are again running screen, which has a shell  
under it *but* you are running the *same* screen that you were  
running before, with the same shell under it as before. Does that  
make sense?

Now, screen's strength comes in when you realise that screen doesn't  
just run one shell underneath it, but it has 40 possible windows,  
each running whatever shell or program you like. Screen does not work  
with X11.


JP



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