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Re: [libvirt-users] Error starting domain: internal error: Unable to add port vnet0 to OVS bridge br0



On 3/15/19 3:21 AM, Harsh Gondaliya wrote:
I have installed OVS from sources using the installation steps mentioned on this link: http://docs.openvswitch.org/en/latest/intro/install/general/

I had installed libvrt, KVM, QEMU and all the necessary packages using apt-get. My KVM-QEMU hypervisor has been running well.

To add a VM with the port attached to OVS bridge I changed the XML domain file as per the instructions on this page: http://docs.openvswitch.org/en/latest/howto/libvirt/

But the when I start the VM using the Virtual Machine Manager I get the following error: *Error starting domain: internal error: Unable to add port vnet0 to OVS bridge br0*

libvirt is creating a tap device, then running ovs-vsctl to attempt to attach it to the configured switch. To see what command is run, and what error is output, add this to your /etc/libvirt/libvirt.d:

  log_filters="1:util.command 1:util.netdevopenvswitch"
  log_outputs="1:syslog:libvirtd.service"

and restart the libvirt service, then attempt to start your guest while watching the system logs. You will see an ovs-vsctl command run by virCommandRunAsync. That command and its output should give you a clue to what is missing from the locally-built openvswitch vs the official package installed with apt-get.


Traceback (most recent call last):
  File "/usr/share/virt-manager/virtManager/asyncjob.py", line 90, in cb_wrapper
     callback(asyncjob, *args, **kwargs)
  File "/usr/share/virt-manager/virtManager/asyncjob.py", line 126, in tmpcb
     callback(*args, **kwargs)
  File "/usr/share/virt-manager/virtManager/libvirtobject.py", line 83, in newfn
     ret = fn(self, *args, **kwargs)
  File "/usr/share/virt-manager/virtManager/domain.py", line 1402, in startup
     self._backend.create()
   File "/usr/lib/python2.7/dist-packages/libvirt.py", line 1035, in create
     if ret == -1: raise libvirtError ('virDomainCreate() failed', dom=self)
libvirtError: internal error: Unable to add port vnet0 to OVS bridge br0

My output for ovs-vsctl show:
3c28f516-dd5c-43cf-bea1-7c068668d1f6
     Bridge "br0"
         Port "enp0s31f6"
             Interface "enp0s31f6"
         Port "br0"
             Interface "br0"
                 type: internal
     ovs_version: "2.11.90"

*However, when OVS is installed using apt-get rather than installing from source or tarball, all these steps work very well.*
*
*
Please guide me why this error is occurring. I am using Ubuntu 16.04 LTS as my host machine. Many users are facing this issue and they have reported it on OVS and other mailing lists. But, none is able to give a satisfactory solution.

Regards,
Harsh


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