On 5/18/05, Jed Reynolds <[EMAIL PROTECTED]> wrote: > Cliff Pratt wrote: > > I've looked in the archives and not seen (ot at least, not recognised) > > anything relevant, and I'm sure this problem is *obvious* to those in > > the know, but it is foxing me. > > > > I connect to my server using ssh usingf putty from a Windows box. When > > I start a UML machine I use the following: > > > > linux ubd0=Debian-3.0r2.ext2 ubd3=swapfs ssl=null con0=fd:0,fd:1 \ > > umid=debbie-01 \ > > con=pts root=/dev/ubd0 \ > > eth0=tuntap,,,172.20.20.59 > > > > That's OK, but it doesn't give the ssh session back! I'm assuming that > > this is because of the "con0=fd:0,fd:1" above. No problems, I just > > start another ssh session to the "host" and use "screen" to access the > > vc I desire through the /dev/pts/x device. > > > > When I 'who' on the host it shows pts/0 for the original host session > > and on the client once started it shows ttyx, depending on the pts > > device I chose. > > > > Ideally I'd like the ssh session back so that I could start more UML > > sessions. But primarily I think I need a better understanding of what > > all these darn pts, tty, con and ptys are, so my first request is for > > some reference that explains the meaning and inter-relationships of > > all these things. I've looked at the "Setting up serial lines and > > consoles" page, and tried to understand it and will continue to do > > so, but I haven't yet grasped it. Does anyone known of a tutorial or > > something that describes these Linux devices in a way that novice can > > understand. Anything would do, even if written at a 7-year old's > > reading level. Pretty pictures would be good too! <grin>. > > > > I have of course, experimented. If I do anything to the > > "con0=fd:0,fd:1" bit above the console session on the ssh (putty) > > session just hangs without producing a list of vcs. As you might > > expect. And I cannot then access the UML machine and have to kill it. > > > > Ideally I'd like to kick off, one, two, three, four, UML machines, and > > get back the ssh session and be able to access the UML machines via > > screen. Is this unreasonable? <grin> > > Cliff, > > You're very close. Your ssh session isn't being given up because your > uml is holding your stdin,stdout by using con0=fd:0,fd:1. The trick is > to start screen with a command from your ssh session. This way, your > screen session can let go of the pts that's associated with your ssh > session. > > I've used a command like this before: > screen -dmS uml01 /home/uml01/startuml.sh > > This forces screen to start in detached mode, with a session id of > uml01, so it's easy to type when you want to do a screen -r later. It > executes the command startuml.sh which would naturally be your uml > startup script. A logical extension of this would be: > > ssh [EMAIL PROTECTED] screen -dmS uml01 /home/uml01/stgartuml.sh > > This would start up your session, and since screen detaches itself, ssh > returns immediately. You just have to ssh back as user uml01 and connect > to that screen to see the console messages. It should be possible, > however, to pipe those console messages thru logger(1) so you can read > them via syslog. Add that to your startuml.sh script. > > I believe that tools more sophisticated than this already exist. Google > for umld and umlazi, IIRC. > Thanks to Jed, above, I've solved my immediate problem. However, I'm still looking for a guide to ttys, ptys, ptss. I've looked on the Net, and not found anything easy enough to get me started. I generally use ssh to connect and 'who' shows, eg, "pts/0". It looks like I might need to set up some serial connections soon, so I'm looking for, basically, the first rung of the ladder. I should be able to take it from there.
Cheers, Cliff ------------------------------------------------------- This SF.Net email is sponsored by Oracle Space Sweepstakes Want to be the first software developer in space? Enter now for the Oracle Space Sweepstakes! http://ads.osdn.com/?ad_idt12&alloc_id344&op=click _______________________________________________ User-mode-linux-user mailing list User-mode-linux-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/user-mode-linux-user
