Daniele: My first thought is that mwum1004 is an ethertap device. That's a dummy ethernet device that can be used to communicate with a single UML instance. Let's say you are running a uml instance as the user umluser and you want to network it to the host. Let's also say the user mode linux kernel program has been renamed "uml_linux" and is installed on your path somewhere like /usr/local/bin/uml_linux, and that a root filesystem for uml_linux to boot and operate from has been created at /home/umluser/root_fs.
Here is how you would manually start a UML instance and connect it through a virtual network to the host. In one xterm as root: tunctl -u umluser -t tap0 ifconfig tap0 10.0.0.1 netmask 255.255.255.0 up In another xterm as umluser, in the directory /home/umluser: uml_linux ubd0=root_fs eth0=tuntap,tap0 mem=64M & Now, in one of the boot scripts inside root_fs, networking from the uml side of things would have to be brought up like this: ifconfig eth0 10.0.0.2 netmask 255.255.255.0 up Once you saw the boot process finish in umluser's xterm, you should be able to ssh or telnet into the uml instance from the host system (well, if you knew any of the username and password combinations in the root_fs's /etc/shadow). Even if you didn't know any usernames or passwords, you should be able to ping 10.0.0.2 from the host system. If I were in your shoes, I would start looking at /home/mwuml004/bin/mwuml004. I'm guessing its a shell script that has commands like the uml_linux one I described above. From that, you may be able to tell which tap devices are being used. If mwum1004 is a tap device that the script assumes has already been created but doesn't attempt to create itself, you can create it like this (as root): tunctl -u mwum1004 -t mwum1004 since it looks like whoever set the system up used the same name for the tap device and user account the UML instance runs from. You may also want to figure out where the root filesystem image the UML instance is booting from is. Once you find it, you can loopback mount it and see what's in the boot scripts, especially how network in configured. Without knowing the IP address and mask assigned in the UML boot scripts, you won't know how to configure it on the host so you can communicate. Chris Marshall --- Daniele Procida <[EMAIL PROTECTED]> wrote: > Hi - I've been left in charge of a server running UML. There are a few > virtual servers hosted on it. > > All was going well until it all went down this morning; the host server > was rebooted, and when it came back up the UML servers didn't. > > I've been left with some instructions, but so far haven't been able to > get the UML servers back again. I think it's a networking issue between > UML and the host server. > > The instructions I've been give say to bring up the interface to the UML > server first: > > ifconfig mwuml004 up > > But I get a: > > mwuml004: ERROR while getting interface flags: No such device > > So I start up the UML server: > > su - mwuml004 /home/mwuml004/bin/mwuml004 > > and ps -fu mwuml004 reveals all kinds of exciting things going on there, > until the thing boots up and settles down into normality. But even if I > now try to bring the interface up again, I still can't get network > access to it - I can't even ping it. > > Does this look like a networking issue at first sight? > > Any suggestions for the next diagnostic step would be gratefully received. > > Thanks, > > Daniele > > > ------------------------------------------------------------------------- > Take Surveys. Earn Cash. Influence the Future of IT > Join SourceForge.net's Techsay panel and you'll get the chance to share your > opinions on IT & business topics through brief surveys-and earn cash > http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV > _______________________________________________ > User-mode-linux-user mailing list > User-mode-linux-user@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/user-mode-linux-user > ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys-and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV _______________________________________________ User-mode-linux-user mailing list User-mode-linux-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/user-mode-linux-user
