2012/7/23 Osier Yang <jyang@redhat.com>:

On 2012年07月23日 17:24, Gao Yongwei wrote:

...

hello,i got a error message when use virsh attach-interface for a vm:

first, list the vm's interface,there's no interface now. virsh # domiflist ubuntum-124 Interface Type Source Model MAC -------------------------------------------------------

then,i did an attach-interface action: virsh # attach-interface ubuntum-124 bridge br0 --persistent Interface attached successfully

virsh # domiflist ubuntum-124 Interface Type Source Model MAC ------------------------------------------------------- vnet0 bridge br0 - 52:54:00:3d:d1:ea

second,detach the interface: virsh # detach-interface ubuntum-124 bridge Interface detached successfully

virsh # domiflist ubuntum-124 Interface Type Source Model MAC -------------------------------------------------------

3rd,attach interface again,at this step ,i got erros like below: virsh # attach-interface ubuntum-124 bridge br0 --persistent error: Failed to attach interface error: internal error unable to execute QEMU command 'device_add': Duplicate ID 'net0' for device

virsh # attach-interface ubuntum-124 bridge br0 error: Failed to attach interface error: internal error unable to execute QEMU command 'device_add': Duplicate ID 'net0' for device

virsh # version Compiled against library: libvir 0.9.10 Using library: libvir 0.9.10 Using API: QEMU 0.9.10 Running hypervisor: QEMU 0.12.1

It's known bug of qemu, there is some race there, though I can't tell what it is exactly. I guess if you sleep several secs before attaching it again, you will succeed. Or you might want to ask in qemu list.

Regards, Osier

thanks,i'll try it as you say to get more info.^^