On 12.03.2014 14:41, Sijo Jose wrote: > > > > Hi, > Could anyone help I'm getting the following error when I tried to add a > new network interface. > > DETAILS > > > Connection > --------------------------- > import libvirt > conn = libvirt.open('qemu:///system') > > Interface XML > ---------------------- > > <interface type="bridge" name="br0"> > <start mode="onboot"/> > <mtu size="1500"/> > <protocol family="ipv4"> > <dhcp/> > </protocol> > <bridge stp="off" delay="0.01"> > <interface type="ethernet" name="eth0"> > <mac address="ab:bb:cc:dd:ee:ff"/> > </interface> > <interface type="ethernet" name="eth1"/> > </bridge> > </interface> > > > > > > In [96]: > > conn.interfaceDefineXML(interfacexml,0) > > ------------------------------------------------------------ > --------------- > libvirtError Traceback (most recent call > last) > /home/saju/<ipython-input-96-0536ffe3fa23> in<module>() > ----> 1 conn.interfaceDefineXML(br1xml,0) > > /usr/lib/python2.7/dist-packages/libvirt.pyc ininterfaceDefineXML(self, > xml, flags) > 2750 libvirtd. """ > 2751 ret= libvirtmod.virInterfaceDefineXML(self._o, xml, > flags) > -> 2752 if retis None:raise libvirtError('virInterfaceDefineXML() > failed', conn=self) > 2753 __tmp= virInterface(self, _obj=ret) > > 2754 return __tmp > > libvirtError: this function is not supported by the connection driver: > virInterfaceDefineXML > > That's because you've libvirt compiled with udev rather than netcf. The netcf is the only one backend that knows how to create a new interface. Install netcf and rebuild libvirt and you should be able to create interfaces via libvirt. Michal