16 04 2013

I had to migrate a Windows VDS from an extremely old node running XenServer 5.5 to a brand new node running KVM on CentOS 6.4. This worked for me, but your mileage may vary..

Run a list to find out the uuid for the VDS

xe vm-list

It will be something like this;

uuid ( RO)           : 24ebdacc-bd8e-637a-7be1-88c08f39059e
name-label ( RW): example
power-state ( RO): running

To create a snapshot of the running VM run;

xe vm-snapshot uuid=24ebdacc-bd8e-637a-7be1-88c08f39059e new-name-label=snapshotname

This will return the uuid of the snapshot, we now need to transform the snapshot into a VM so we can save it as a file;

xe template-param-set is-a-template=false ha-always-run=false uuid=522e2553-8262-bbce-7199-fd178691d9d8

If you don’t have enough space on the mounted file system, you might need to do what I did and create a new logical volume (slightly bigger than the current image size) and mount it.

lvcreate -L30G -n example vg

Where vg is the name of your volume group.

Then make the filesystem type and mount it;

mkfs -t ext3 /dev/vg/example

mkdir /mnt/example

mount /dev/vg/example /mnt/example

Now we will save the snapshot to a file.

xe vm-export vm=522e2553-8262-bbce-7199-fd178691d9d8 filename=/mnt/example/example.xva

Then you just need to copy the image to the KVM node, via your method of choice. I would recommend creating a lv on the node with at least 3 times the size of the current disk image size (for working space).

Once you have got it onto the new node, you need to convert the xva file to a image file.

To do this you can use a super awesome python script.

You need to untar the xva file before you can convert it.

tar -xvf example.xva

cd into the created directory, you will then see a folder that looks like;

Ref\:39/

Get the python script (Requires Python 2.4);

wget http://nerdier.co.uk/xenmigrate.py

Then run the following to convert the extracted .xva to a .img

python xenmigrate.py -c Ref\:39/ example.img

Create a loopback device for the image;

losetup /dev/loop0 /path/to/example.img

Create the lv for the VDS

lvcreate -L21G -n example vg

dd the image to the lv

dd if=/dev/loop0 of=/dev/vg/example

Run virt-install

virt-install --name=example --cpuset=auto --ram=1024 --network bridge=br123 --disk=/dev/vg/example --vnc --vnclisten=0.0.0.0 --noautoconsole --cdrom=/win2k8.iso

Check which port VNC is running on

netstat -an | grep 59

Then connect to the server IP/Port with your VNC client to configure the network on the VDS.

Once that’s done, shutdown the VDS so you can disable VNC by doing;

virsh edit example

Remove the following lines and then save/exit.

<graphics type='vnc' port='-1' autoport='yes' listen='0.0.0.0'>
     <listen type='address' address='0.0.0.0'/>
</graphics>

Start the VDS

virsh start example

Once it’s all up and running, you just need to remove the working space you made with lvremove (after unmounting it).

Makepasswd Installing Redmine on cPanel.