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