Hi Rajiv

On Mon, Jul 19, 2010 at 02:45, Rajiv Rajaian <rajiv.care@gmail.com> wrote:
Hi 
I want to the create the guest os from existing configured disk /var/lib/libvirt/images/centos.img.. What modifications should be done with my configuration file ??

You can import the .img executing virt-install with this parameters (this is just an example): 
virt-install --name NewVM --ram 512 --vcpus 1 --disk path=/var/lib/libvirt/images/centos.img --import --noautoconsole --force

-- Carla