8:26 a.m.
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
LXC guest which uses the same source network starts just fine.
I'm on Centos 7 with openvswitch-2.9.0-3.el7.x86_64 from
centos-openstack-pike repo and libvirt-4.5.0-10.el7_6.7.x86_64.
Would anybody care to suggest a possible reson(s) causing the failure?
many thanks, L.
8:44 a.m.
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
8:58 a.m.
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
qemu's: (fails to start)
<interface type='network'>
<mac address='52:54:00:20:e1:47'/>
<source network='ovs-br0' portgroup='vlan-54'/>
<model type='virtio'/>
<address type='pci' domain='0x0000' bus='0x00'
slot='0x09'
function='0x0'/>
</interface>
LXC's: (starts)
<interface type='network'>
<mac address='52:54:00:53:ac:e5'/>
<source network='ovs-br0' portgroup='vlan-55'/>
<model type='virtio'/>
</interface>
This is Openvswitch' bridge thus does not exits as "iface" per say, but
this is how it should be used in libvirt, I think, no? LXC works okey.
How is it different for Qemu?
thanks, L
9 a.m.
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
network:
<network>
<name>ovs-br0</name>
<uuid>e5129e76-1576-4866-97e1-42f14263cfc2</uuid>
<forward mode='bridge'/>
<bridge name='ovsbr0'/>
<virtualport type='openvswitch'/>
<portgroup name='vlan-54'>
<vlan>
<tag id='54'/>
</vlan>
</portgroup>
<portgroup name='vlan-55' default='yes'>
<vlan>
<tag id='55'/>
</vlan>
</portgroup>
</network>
9:04 a.m.
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
and OVS' bits:
$ ovs-vsctl show
79bc7faa-a7cd-482c-95ad-8b0e8f89a6f1
Bridge "ovsbr0"
Port "ovsbr0-port0"
tag: 55
Interface "ovsbr0-int0"
type: internal
Port "vnet16"
tag: 55
Interface "vnet16"
Port "ovsbr0-p3p1"
Interface "p3p1"
type: system
Port "vnet18"
tag: 54
Interface "vnet18"
ovs_version: "2.9.0"
created with/by NM.
11:23 a.m.
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
...
6:44 a.m.
On 5/10/19 6:23 PM, lejeczek wrote:
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
That is expected. <forward mode='bridge'/> is document like so:
https://libvirt.org/formatnetwork.html#elementsConnect
Michal
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