zfs discuss - Oct 2007 - Installing a zvol-based gentoo domU from an existing linux partition

# I booted the gentoo partition

emerge xen-sources
cd /usr/src/linux-2.6.20-xen-r6
mount /boot
make && make install && make modules install
tar Ccp / linux-2.6.20-xen-r6-x64.tar.gz /boot/*2.6.20-xen-r6* /lib/ 
modules/*2.6.20-xen-r6*

# I transfered my xen domU kernel to a safe place.

# Now we can reboot in Solaris dom0

# Let''s create a 10 gig zvol

zfs create -V 10G tank/gentoo-disk

# The gentoo partition was on partition 4 of the c2t0d0p0 (your  
mileage may vary.)
# We create a xen config file that will drop us in a bash shell

cat >gentoo.py <<EOF
name = "gentoo"
vcpus = 1
memory = 512
kernel = "/tank/xen/gentoo/boot/vmlinux-syms-2.6.20-xen-r6-domU"
extra = "init=/bin/bash"
disk = [ ''phy:/dev/dsk/c2t0d0p0,hdb,w'',
''phy:/dev/zvol/dsk/tank/
gentoo-disk,xvda1,w'' ]
root="/dev/hdb4 ro"

vif = ['''']

on_shutdown = "destroy"
on_reboot = "restart"
on_crash = "destroy"

EOF

# let''s start the domU

xm create gentoo.py  -c

# now we need to remount the root partition rw and create xvda device  
and create an ext3 filesystem (they can resize nicely and are better  
supported then reiserfs [author is jail] and xfs [SGI bankrupt])

mount -o rw,remount /
mknod /dev/xvda1 b 202 1
mke2fs -j /dev/xvda1

mount /dev/xvda1 /mnt

# Now let''s copy the content of our original filesystem to the zvol
ext3

tar Ccp   / --one-file-system . | tar Cxp /mnt

# We need to fix fstab

cat >/mnt/etc/fstab <<EOF
/dev/xvda1              /            ext3     noatime  1 1
#/dev/sda3              /boot        ext2    noauto,noatime  1 2
proc                   /proc        proc    defaults        0 0
shm                    /dev/shm     tmpfs   nodev,nosuid,noexec 0 0
/dev/cdroms/cdrom0     /mnt/cdrom   iso9660 noauto,ro   0 0
EOF

# We need to disable hardware checksuming for eth0

cat >>/mnt/etc/conf.d/net <<EOF
postup() {
     if [[ "${IFACE}" == "eth0" ]] ; then
     /usr/sbin/ethtool -K ${IFACE}  tx off

}
EOF

vi /mnt/etc/inittab # comment all all the c2:c5 getty entries and  
keep the first one (c1)

umount /mnt
mount -o ro,remount /
halt

# Now this is our final gentoo.py

cat >gentoo.py <<EOF
name = "gentoo"
vcpus = 1
memory = 512
kernel = "/tank/xen/gentoo/boot/vmlinux-syms-2.6.20-xen-r6-domU"
extra = ""
disk = [ ''phy:/dev/zvol/dsk/tank/gentoo-disk,xvda1,w'' ]
root="/dev/xvda1 ro"

vif = ['''']

on_shutdown = "destroy"
on_reboot = "restart"
on_crash = "destroy"
on_xen_start = "start"
EOF

xm new gentoo.py
xm start gentoo.py

voila :D

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You can find it here http://www.kugutsumen.com/showthread.php?t=1701
 
 
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