[libvirt-users] Unable to provision VM attaching it directly to a OVS bridge

[Lucas Brasilino]

Hi

Getting deeper, the error is raised by 'virDomainCreateLinux()'.
Here comes the snippet of the XML argument passed to this call:

(Pdb) print xmlDesc
<domain type='kvm'>
  <name>vm2</name>
  <uuid>3d713513-e8ee-994a-0eba-51128bd4b42e</uuid>
[...]
  <interface type='bridge'>
      <source bridge='databr0'/>
      <mac address='00:00:00:00:00:03'/>
      <model type='virtio'/>
    </interface>
[...]
</domain>

So libvirt network driver is surely trying to use 'databr0' as the
common Linux bridge implementation, not an Open vSwitch bridge.

I tried to add an

<virtualport='openvswitch'/>

element in the XML created by virt-install and use 'virsh create' to
create it but
seems that libvirt's network driver does not support Open vSwitch when
creating VM's.
Is there some planning to support it ?

Thanks!

regards
Lucas Brasilino
MSc Student @ Federal University of Pernambuco (UFPE)
twitter: @lucas_brasilino

2013/10/28 Lucas Brasilino <lrbbs at cin.ufpe.br>:
> Reposting from virt-tools mailing list:
>
> Hi!
>
> I'm facing a problem that could be triggered by some lacking
> of support from libvirt on Open vSwitch (or could be my mistake).
>
> I have interests in researching on virtual networks and
> SDN. To keep things simple, I've decided to use libvirt/virt-tools to
> manage VM's since my focus is on the network, instead of using a
> full feature system like OpenStack.
>
> I'm quite new with libvirt/virt-tools, but I have a good experience with
> openvswitch and other virtualizations technologies (which I dropped in
> libvirt/kvm favor).
>
> I'm using Fedora 19 packages
>
> openvswitch (1.11.0-1.fc19.x86_64)
> libvirt (1.0.5.6-3.fc19.x86_64)
> virt-install (0.10.0-4.fc19.noarch)
>
> I've created an OVS bridge (databr0) outside libvirt, and then defined it
> inside libvirt with:
>
> <network>
>   <name>databr0</name>
>   <forward mode='bridge'/>
>   <bridge name='databr0'/>
>   <virtualport type='openvswitch'/>
> </network>
>
> And then 'net-autostart' and 'net-start' it with virsh. Now I've got:
> #  virsh net-list
>  Name                 State      Autostart     Persistent
> ----------------------------------------------------------
>  databr0              active     yes           yes
>
> When I try to provision an VM, if I use the virt-install option
> "--network=bridge:databr0,model=virtio,mac=00:00:00:00:00:03"
> I got the following error:
>
> # virt-install --connect qemu:///system --virt-type kvm --name vm2
> --ram 768 --disk path=/home/lucas/local/vm/images/vm2.img --vnc
> --cdrom /home/lucas/local/vm/fc19-x86_64.iso
> --network=bridge:databr0,model=virtio,mac=00:00:00:00:00:03
> --os-type=linux --os-variant fedora19
>
> Starting install...
> ERROR    Unable to add bridge databr0 port vnet0: Operation not supported
> Domain installation does not appear to have been successful.
> If it was, you can restart your domain by running:
>   virsh --connect qemu:///system start vm2
> otherwise, please restart your installation.
>
> I just managed to create a VM when I use '--nonetworks' option and after
> I do a 'virtsh edit vm2' and add:
>
>   <interface type='bridge'>
>       <mac address='00:00:00:00:00:03'/>
>       <source bridge='databr0'/>
>       <virtualport type='openvswitch'/>
>       <model type='virtio'/>
>       <address type='pci' domain='0x0000' bus='0x00' slot='0x05'
> function='0x0'/>
>     </interface>
>
> Well, I read elsewhere that openvswitch bridging isn't fully
> supported. Is it the case or I'm facing another kind of problem ?
>
> regards
>
> Att
> Lucas Brasilino
> MSc Student @ Federal University of Pernambuco (UFPE)
> twitter: @lucas_brasilino