Cloning the sample image

• Create the root & swap partitions

  lvcreate -L 12G -n arc02_root vg_root
  lvcreate -L 4G -n arc02_swap vg_root
  mkswap /dev/vg_root/lrms02_swap -L SWAP-hdb1

• from xen11:

  cat /scratch/sample_root.img | ssh xen14 'cat > /dev/vg_root/lrms01_root_REPLACE_THIS_DEVICE'

• Create the xen config file

  cp /etc/xen/sample /etc/xen/arc02

• Mount the new image

  kpartx -a /dev/vg_root/arc02_root
  mount /dev/mapper/arc02_root1 /mnt

• run ./finalize_xen_guest.sh HOSTNAME MAC
• Umount the image

  cd /
  umount /mnt
  kpartx -d /dev/vg_root/arc02_root

NOTE-NOTE-NOTE: Avoid using the dash (-) in the name of the images, because it triggers a bug (added by FG, 20100825)

Creation of a Xen Sample image

lvcreate -L 12G -n sample_root vg_root
dd if=/dev/vg_root/ui64_root of=/dev/vg_root/sample_root

Then, we need to create a /etc/xen/sample file with this content:

name = "@@SIMPLENAME@@"

vcpus = 2
memory = 4096
disk = ['phy:/dev/vg_root/@@SIMPLENAME@@_root,xvda,w',
        'phy:/dev/vg_root/@@SIMPLENAME@@_swap,xvdb,w']
vif = ['mac=@@MAC@@,bridge=xenbr0']

bootloader = "/usr/bin/pygrub"
on_reboot = 'restart'
on_crash = 'destroy'

Afterward we need to mount the sample image from the xen host, but we need to map it first (it's a partitioned block device):

kpartx -a /dev/vg_root/sample_root
mount /dev/mapper/sample_root1 /mnt/

To find the files to change, running a grep test54 /mnt/etc/* -R will help, but see below. Then go file by file and change to fit this variables (examples, they need to match the finalize_xen script):

• @@NAME@@
• @@IP_LAST@@ (last two digits of the IP, to be able to match 148.187 and 10.10 interfaces with the same field)

You may want also to do some tweaking to the ifcfg-eth*:

• Delete the line HWADDR if you are setting up static IP addresses (so that you don't need a Mac adddress specified, it works with any)

And this is the list of the files that were changed

/mnt/etc/dhclient-eth0.conf
/mnt/etc/hosts
/mnt/etc/sysconfig/network
/mnt/etc/sysconfig/networking/profiles/default/ifcfg-eth0
/mnt/etc/sysconfig/networking/profiles/default/ifcfg-eth1
/mnt/etc/sysconfig/networking/profiles/default/network

Furthermore, you want to delete the local host ssh keys that are generated the first time sshd starts, to be unique in the next boot. rm /mnt/etc/ssh/ssh_host_*

Also, you would like to enable access to the xen console:

• edit /etc/inittab and add the line co:2345:respawn:/sbin/agetty xvc0 9600 vt100-nav to the console lists. You can comment the rest out.
• edit /etc/securetty and add the line xvc0

At the end we need to umount the sample image and unmap it:

cd /
umount /mnt
kpartx -d /dev/vg_root/sample_root

-- PabloFernandez - 2010-02-18