[libvirt-users] Cannot get interface MTU - qemu quest fails to start off OpenVswitch

[lejeczek]

On 10/05/2019 14:44, Michal Privoznik wrote:
> On 5/10/19 3:26 PM, lejeczek wrote:
>> hi guys
>>
>> I have a qemu guest and openvswitch bridge and the guest fails to start:
>>
>> $ virsh start work8
>> error: Failed to start domain work8-vm-win2016
>> error: Cannot get interface MTU on 'ovsbr0': No such device
>
> Well, this means that 'ovsbr0' doesn't exist. Is that so? Can you
> share your <interface/> configuration and the network XML?
>
> Michal

so if your libvirt's net is like this:

<network>
  <name>ovs-br0</name>
  <uuid>e5129e76-1576-4866-97e1-42f14263cfc2</uuid>
  <forward mode='bridge'/>
  <bridge name='ovsbr0'/>
  <virtualport type='openvswitch'/>
....

then you need extra(extra for ovs tools create both for us at bridge
creation time and nmcli(you) need to create those explicitly) port+iface
so this:

$ ovs-vsctl show

output will contain this:

...

Port "ovsbr0"
            Interface "ovsbr0"
                type: internal

...


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