On Wednesday 07 December 2005 01:38, Naveen Koppaka wrote: > The device node /dev/ubd/0 for the root filesystem is missing,
A) devfs is evil. Just don't go there. B) The naming scheme in /sys goes more like /dev/ubda (and then there are partitions ala /dev/ubda2). This is obviously the UML /sys, not the host /sys. C) You gotta mknod the suckers or they won't exist. Udev can do it for you, or here's my brain dead /dev mounty script. (Attached). Won't help you mount root, of course. > CONTROL-D will exit from this shell and REBOOT the system. > > Give root password for maintenance > (or type Control-D to continue): > (none):~# ls > (none):~# Ah, you're booting Red Hat. This is Red Hat's characteristic way of curling up into a ball and sucking its' thumb. The contents of /etc/fstab don't match the mount points you're actually using. The kernel is indeed mounting /root correctly and booting from the ubd you fed it (or else you wouldn't have gotten this far), but Red Hat thinks it starts out with root mounted read-only (a holdover from the pre-journaling days), and when it tries to remount its root partition read-write it uses /etc/fstab instead of just doing a "remount -o remount,rw /", and when /etc/fstab is out of step with reality it all goes pear shaped. Did I mention that Red Hat's init scripts are way overcomplicated, incredibly brittle, and verge on the incomprehensible? The easy thing to do is fix /etc/fstab in your image to know about /dev/ubda. If you're not using udev you may also have to add the appropriate nodes to /dev. I find building hostfs into the UML kernel and then doing the following to be quite useful: ./linux rootfstype=hostfs rw init=/bin/sh ubd0=/path/to/hda.img $ whoami $ mount -t sysfs /sys /sys $ cd /sys/block $ ls -l $ ls -l ubda $ cat ubda/dev # and here's your major/minor for that device. Anything under /sys/block is a block device, anything under /sys/class is a char device. See the attached script for more details. Note that there won't _be_ a ubda under /sys/block unless the ubd0= argument you fed it on the command line could be found. Also note you can mount your ubda (with partitions even, they'll be /sys/block/ubda/ubda1 and so on) and modify the fstab here. Remember to umount it before exiting. To exit without a "tried to kill init" panic, use "halt -f". If you're using devfs, you're on your own. > plz respond me what i have to do furthur Learn your way around the guts of the system? Rob -- Steve Ballmer: Innovation! Inigo Montoya: You keep using that word. I do not think it means what you think it means.
setupdev.sh
Description: application/shellscript
