Re: [Xen-users] how to copy a guest

[Simon Hobson <linux@xxxxxxxxxxxxxxxx>]

ma qiang wrote:

>     I have installed xen on the computer, and adopted LVM as domU's
> storage devices. I have installed a centos for the domU, now I want to
> copy this system as another domU, Who can tell me how?
I'm assuming you've used LVM to create separate volumes for each DomU.

There is probably a way to get LVM to clone a drive - it's not 
something I've done, and would require you shut down the guest first 
so as to have a clean filesystem.
The way I do it is to create the new volumes for the new guest, 
create the filesystems, and mount them in Dom0 - eg mount guest2root 
on /mnt, guest2var on /mnt/var and so on. Then I use rsync to copy 
the existing guests filesystem into the ones mounted on Dom0 - this 
can be done with the guest running though you will end up with some 
temporary files copied.
From Dom0 you'd use the command :
rsync -avHx root@guest1:/ /mnt/
rsync -avHx root@guest1:/var/ /mnt/var/

Or from the guest you'd do it like :
rsync -avHx / root@dom0:/mnt/
rsync -avHx /var/ root@dom0:/mnt/var/

Note the trailing '/' on the paths, it makes a difference to how 
rsync copies the files.
Alternatively, you can stop the existing guest and mount it's 
filesystems in Dom0 as well, eg guest1root on /mnt1, guest2var on 
/mnt1/var.
rsync -avHx /mnt1/ /mnt2/
rsync -avHx /mnt1/var/ /mnt2/var/

Or there are other tools you can use, a lot depends on your preferences.
cpio will do it, cp will do it with recursive and preserve options set.

--
Simon Hobson

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