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SME Server as Xen Host

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SME Versions Supported: SME Server 7 beta series (Centos 4.2) - - Contribs.org certified on: ?

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Author(s): hfwang
Contributor(s): DarkMirage, snoble
License: GPL

Created:	june 2005	Last updated:	december 8, 2005

Notes: Work in progress!!!!! Use at your own risk! I am not a programming or compiling jedi, so use the force ;-)

(local copies of requiered RPM's or sources can be found here)

Procedure:

You need your box to be connected to the internet
Download and install devtools-7.0
Download and install python-twisted
Download and install curl-devel
Download Xen 2.0.7 stable source
Untar xen-2.0.7-src.tgz into the '/usr/src' directory
Check all requirements before compiling and installing Xen. Change into directory '/usr/src/xen-2.0/tools/check'
Issue the command './chk build' and './chk install' if anything is wrong, it will be listed in the logfiles within the same directory
If the checks are ok (no logs), change back to the '/usr/src/xen-2.0' directory
Prepare some compiling stuff:

cd /usr/src/linux-2.6.9-11.EL (or make sure you are in your source directory)
cp configs/config-for-my-kernel .config (find out your correct kernel with 'uname -a')
make oldconfig
make include/asm
make include/linux/version.h
make SUBDIRS=scripts

Change back to the Xen source dir and compile Xen by issueing the 'make world' command (this will download the 2.4 and 2.6 kernels from kernel.org)
Install Xen by issueing 'make install'
Add the new Xen kernel to Grub (/boot/grub/grub.conf) to match the below example:

default=0
timeout=10
title Xen 2.0.6 (kernel 2.6)
        kernel /xen-2.0.gz dom0_mem=512000
        module /vmlinuz-2.6-xen0 ro root=/dev/md1 ro console=tty0
title CentOS-3-up (2.4.21-32.0.1.EL)
        root (hd0,0)
        kernel /vmlinuz-2.4.21-32.0.1.EL ro root=/dev/md1
        initrd /initrd-2.4.21-32.0.1.EL.img
title CentOS-3 (2.4.21-32.0.1.ELsmp)
        root (hd0,0)
        kernel /vmlinuz-2.4.21-32.0.1.ELsmp ro root=/dev/md1
        initrd /initrd-2.4.21-32.0.1.ELsmp.img

where dom0_mem=xxxxxx the amount of memory you assign to the kernel. Do not use all memory, leave about 100Mb free for Xen

Reboot and select the new kernel which is the new default

There is still an error once the machine has booted, try to do a 'lsmod' (QM_MODULES). I have found some clue:

If you want QM_MODULES to go away install module-init-tools that will take
care of it, as far as this... file /lib/modules/2.6.11.10-xenU/modules.dep
(No such file or directory)

well, its not there, so shut down the domU and ..

mount -o loop image.img /mount/point

cp -dpR /lib/modules/2.6.11.10-xenU /mount/point/lib/modules/

umount /mount/point

rev up the domU and have fun  :)

The above is a proof of concept of the use of Xen and SME Server 7.0beta. Upto now, normal SME Server 7.0beta operation is not being infuenced by the Xen kernel. If you do encounter issues, please let them know.

TO DO

Is it possible to recomplile the stock SME Server 7.0beta kernel with Xen in it so the new kernel becomes the default kernel?
During the compilation of Xen, it recognises the sepcific hardware/driver and, modules of the machine it is compiled on. How does this effect a stock kernel? Is this anaconda related?
Testing, testing, testing...

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