UML_Fedora_Core_4
- UML Fedora Core 4 FC4/x86_64 host with FC4/i386 UMLs* (Phill Wombat uml_at_webwombat.com)%
- Last updated Wed, December 7, 2005
- Reference sites
- Host
- Completely standard FC4 x86_64 install.
- Add compatibility headers (to allow i386 code to compile).
- Needed for SUBARCH=i386 during kernel compile
- Create UML kernel.
- Create a sub-directory in your home directory called download
- http://www.kernel.org/
- download linux-2.6.12.tar.bz2
- http://www.user-mode-linux.org/~blaisorblade/patches/guest/uml-2.6.12-bb10-skas0/
- download uml-2.6.12-bb10-skas0.patch.bz2
- Run this shell script to compile it all up (from your home directory - logged in as you): MyCompileScript
- Now using 32 bit binary UMLs from Blaislorblade's site (20051207). Working well.
- Get a pristine root_fs
- Create a sub-directory called uml
- http://www.stearns.org/uml-root/
- download http://www.stearns.org/uml-root/root_fs.fc-4-base.pristine.20050622.bz2
- Extract it using the recommended procedure
- cp -p --sparse=always <( cat root_fs.fc-4-base.pristine.20050622.bz2 | bunzip2 -c - ) root_fs.fc4
- Recently used yum3 to create an FC4/x86_64 rootfs. It should be easily modifiable to create an x86 fs.
- Here begins the process that took some time to figure out, with lots of help from the lists and others.
- Fix pthreads in FC4
- As of 2006-03-08, Blaisorblades binaries include the TLS patch(es) needed to overcome the NPTL issues (patches by Jeff Dyke I believe. Well done this was hard.).
- I have run the bsx-tls kernels with a slightly modified RedHat Enterprise Linux 4 rootfs originally installed in VMWare (completely standard install, then hacked at /dev for the uml devices).
- e2fsck grumbles because it thinks the root device is /dev/ubd/0 not /dev/ubda (hack /etc/rc.sysinit and code a symlink).
- To be done: test FC4 rootfs in the same way.
- Skip the rest of this section!
- mount the root_fs (leave it mounted for the steps needing root_fs: precise details depend on your layout)
- mount -t ext3 root_fs.fc4 mnt/ -o loop
- cd mnt/lib
- cp -R obsolete/linuxthreads/*.so .
- there's an i686 revision too which you might like to try out.
- I've been finding that RPM (in particular) doesn't like it when /lib/i686 is present. I've moved mine to /lib/i686.moved and this work better now.
- After upgrading glibc and glibc-common I had to move /lib/i686 again to /lib/i686.moved (or anything really).
- I've been finding that RPM (in particular) doesn't like it when /lib/i686 is present. I've moved mine to /lib/i686.moved and this work better now.
- there's an i686 revision too which you might like to try out.
- rm libpthread.so.0
- ln -s libpthread-0.10.so libpthread.so.0
- More recently I've found that lots of things call /sbin/ldconfig which rejigs all my soft links again back to the originals (mostly rpm and yum, but other things too). So I've now moved /sbin/ldconfig to /sbin/ldconfig-orig and put a shell script in it's place. This completely solves the pthread thing once and for all!
- As of 2006-03-08, Blaisorblades binaries include the TLS patch(es) needed to overcome the NPTL issues (patches by Jeff Dyke I believe. Well done this was hard.).
- Add a tty device in for the inittab and stop X from starting.
- mknod -m 660 console c 5 1
- Do this in the root_fs's /dev directory
- edit /etc/inittab
- 0:2345:respawn:/sbin/mingetty tty0
- Comment all other vc/x and tty4 etc. etc. out. Don't want them.
- #x:5:once:/etc/X11/prefdm -nodaemon
- MyInitTab
- mknod -m 660 console c 5 1
- Add the modules from the kernel into the root_fs
- make modules_install INSTALL_MOD_PATH=mnt/ ARCH=um SUBARCH=i386
- Jig the /etc/rc.d/rc.sysinit
- Again as of 20060308 this is no loner needed. The only issue I see is / is /dev/ubda not /dev/ubd/0 as rc.sysinit figures out, so it fsck's the wrong device. Just add a line of code before it tries to check the root device like mkdir /dev/ubd; ln -sf /dev/ubda /dev/ubd/0 and everything starts up correctly. The ubd dir seems to be deleted on every boot. Don't do the rest of this section anymore.......
- Comment out lines. Needed because of static linkages to wrong threads library (so I believe).
- Everything to do with fsck (lot of stuff).
- This remains a problem because I don't know how to e2fsck a COW fs from the host.
- You can fsck your non-COW file systems from the host with e2fsck filename.
- 2 lines with nash in them
- MySysInit
- Comment out pam_loginuid.so in /etc/pam.d/login
- #session required pam_loginuid.so
- Don't ask. Just do this in blind belief.
- umount the root_fs
- First time run of your new FC4 virtual computer!
- /home/phill/linux-2.6.12/linux single mem=160m mode=skas0 ubda=cow.vm1,root_fs.fc4 ubdb=swap root=/dev/ubda con=pty con0=fd:0,fd:1 eth0=tuntap,vm1,,
- ethernet setup is beyond the scope of this wiki page..... I have 32 IP address allocated for 32 machines.
- Change the root password right now!
- Change the networking details.
- type exit.
- /home/phill/linux-2.6.12/linux single mem=160m mode=skas0 ubda=cow.vm1,root_fs.fc4 ubdb=swap root=/dev/ubda con=pty con0=fd:0,fd:1 eth0=tuntap,vm1,,
- Congratulations, your new UML is now running and listening on the ethernet with sshd.
- RebuildRPM without NPTL reliance
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