? 2011?10?21? 17:32, vmnode guy ??: there are commands to do the modifications? e.g. for vnc password changes, HDD: # virsh update-device for mem: # virsh setmem # virsh setmaxmem for detach/attach NIC: # virsh attach-device # virsh detach-device Not sure how you want to modify the "CPU", you could see if following commands satisfy you requirement: # virsh setvcpus (if you are using qemu-kvm, the cpus in guest won't be hotpluged/unhotpluged actually, as it lacks support) # virsh vcpupin All these commands support change persistent config, But if you are trying to modify a bunch of domains, scripts is better, though it's not supported offically by libvirt to modify the domain configs externally. Regards Osier