Setting up Xen on OpenSUSE is relatively straightforward if you follow the Xen howto on the Wiki: http://en.opensuse.org/Installing_Xen3
The latest Xen OpenSUSE 10 files can be downloaded from here:
http://www.suse.de/~garloff/linux/xen/RPMs-100/
For my setup I have used the following /etc/fstab file on my virtual server:
/dev/hda1 / reiserfs acl,user_xattr 1 1
/dev/hda2 swap swap defaults 0 0
proc /proc proc defaults 0 0
sysfs /sys sysfs noauto 0 0
usbfs /proc/bus/usb usbfs noauto 0 0
tmpfs /dev/shm tmpfs defaults 0 0
devpts /dev/pts devpts mode=0620,gid=5 0 0
/dev/shm /opt/zimbra/amavisd-new-2.3.3/tmp tmpfs defaults,users,size=150m,mode=777 0 0
I did initally have a lot of trouble setting up the network on the virutal instance but after a lot of experimenting with different Xen packages and configuration options I finally settled on the following file (/etc/xen/zimbra):
# -*- mode: python; -*-
# configuration name:
name = "zimbra"
# usable ram:
memory = 512
# kernel und initrd:
kernel = "/boot/vmlinuz-xen"
ramdisk = "/boot/initrd-xen"
# boot device:
root = "/dev/hda1"
# boot to run level:
extra = "3"
# network
nics=1
vif = [ 'mac=aa:00:00:50:02:f0, bridge=xenbr0' ]
dhcp ="dhcp"
hostname="zimbra"
# storage devices:
disk = [ 'phy:system/mail,hda1,w','phy:system/mailswap,hda2,w' ]
One last thing is that the Xen howto modifies the virtual server's mtab file with the following line:
sed -e "s/^[1-6]:/#\\0/" < ./etc/inittab > ./etc/inittab.new
This command also commented out the default console as well as the other terminal consoles which meant that after installation there was no login prompt. In order to correct this edit the /etc/inittab file on the virtual server (whilst it is still mounted on the host system) and uncomment the following line:
1:2345:respawn:/sbin/mingetty --noclear tty1