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

[Laine Stump]

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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