[ovs-discuss] Installing VM on KVM hypervisor in Ubuntu 14.04 with OVS bridge

[Ramana Reddy]

I got the following error after trying this command:

$sudo virt-install --connect qemu:///system --force --name VM2 --ram=1024
--vcpus=1 --disk path=/var/lib/libvirt/images/VM2.img,size=8,format=qcow2
--cdrom=/home/ramanar/Downloads/ubuntu-14.04.3-server-amd64.iso --vnc
--os-variant=ubuntutrusty --network=br0,model=virtio
ERROR    Error in network device parameters: Unknown network type br0

*br0.xml file:*
 <network>
   <name>br0</name>
   <forward mode='bridge'/>
   <bridge name='br0'/>
   <virtualport type='openvswitch'/>
  </network>

Did I miss something.


On Tue, Oct 6, 2015 at 12:34 AM, Scott Lowe <scott.lowe at scottlowe.org>
wrote:

> Please see my responses inline, prefixed by [SL].
>
> Ramana Reddy <gtvrreddy at gmail.com> wrote:
>
> > Hi Scott,
> >
> > I followed your blog mentioned in the url. I tried the following steps:
> >
> > Create a br0.xml file:
> > <network>
> >   <name>br0</name>
> >   <forward mode='bridge'/>
> >   <bridge name='br0'/>
> >   <virtualport type='openvswitch'/>
> > </network>
> >
> > $sudo virsh net-define br0.xml
> > Network br0 defined from br0.xml
> >
> > $sudo virsh net-start br0
> > Network br0 started
> >
> > $sudo virsh net-list --all
> >  Name                 State      Autostart     Persistent
> > ----------------------------------------------------------
> >  br0                  active     no            yes
> >
> > $sudo qemu-img create -f qcow2 /var/lib/libvirt/images/VM2.img 8G
> > Formatting '/var/lib/libvirt/images/VM2.img', fmt=qcow2 size=8589934592
> encryption=off cluster_size=65536 lazy_refcounts=off
> >
> > $sudo virt-install --connect qemu:///system --force --name VM2
> --ram=1024 --vcpus=1 --disk
> path=/var/lib/libvirt/images/VM2.img,size=8,format=qcow2
> --cdrom=/home/ramanar/Downloads/ubuntu-14.04.3-server-amd64.iso --vnc
> --os-variant=ubuntutrusty --network=bridge:br0,model=virtio
> >
> > Starting install...
> > ERROR    Unable to add bridge br0 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
> >
> > $sudo ovs-vsctl show
> > 92d0c0b6-bbbb-4f86-aebd-ec4cc33653a3
> >     Bridge "br0"
> >         Port "br0"
> >             Interface "br0"
> >                 type: internal
> >         Port "eth0"
> >             Interface "eth0"
> >
> >
> >
> > Any idea why this approach is not working.
>
>
> [SL] If you create a libvirt network to "front end" the OVS bridge, then
> you would no longer use "--network=bridge:br0,model=virtio" but
> "--network=br0,model=virtio" (specifying the name of the libvirt network
> that you created).
>
> Hope this makes sense.
>
>
> > Some how the second method is working fine. I created a VM using NAT,
> and then modified VM XML file as per instructions mentioned below:
> > <interface type='bridge'>
> >   <mac address='52:54:00:71:b1:b6'/>
> >   <source bridge='br0'/>
> >   <virtualport type='openvswitch'/>
> >   <address type='pci' domain='0x0000' bus='0x00' slot='0x03'
> function='0x0'/>
> >  </interface>
> >
> > This is working now. I tried this one previously, and not working. May
> be it messed up with some thing!!
> >
> > Thanks for all your inputs. I thought that I can go with my old setup
> (ubuntu 12.04 with brcompat module with ovs 1.9.3: it was working well).
> >
> >
> >
> >
> >
> >
> > On Mon, Oct 5, 2015 at 9:51 PM, Scott Lowe <scott.lowe at scottlowe.org>
> wrote:
> > Please see my response below.
> >
> > Ramana Reddy <gtvrreddy at gmail.com> wrote:
> >
> > > Hi all,
> > >
> > > I installed a VM in NAT mode using virt-manager and edited the xml
> file as per the
> > > instructions  given in this link:
> > >
> > >
> http://git.openvswitch.org/cgi-bin/gitweb.cgi?p=openvswitch;a=blob_plain;f=INSTALL.Libvirt;hb=HEAD
> > >
> > > Basically It tells the following modofications:
> > > And change it to something like this:
> > >
> > >  ...
> > >  <interface type='bridge'>
> > >   <mac address='52:54:00:71:b1:b6'/>
> > >   <source bridge='ovsbr'/>
> > >   <virtualport type='openvswitch'/>
> > >   <address type='pci' domain='0x0000' bus='0x00' slot='0x03'
> function='0x0'/>
> > >  </interface>
> > >  ...
> > >
> > > After modifications, I started VM. But its throwing the errors: Unable
> to complete install: 'Unable to add bridge br0 port vnet0: Operation not
> supported'
> > >
> > > I started VM with both virsh start VM and virt-manager, but both are
> giving the same error.
> > >
> > > Does any one face the same problem. Please help me in this regards.
> >
> >
> >
> > Can you share the actual XML you're using (just the network interface
> portion is needed), along with the output of "ovs-vsctl show"?
> >
> > Also, I (personally) find the easiest way to work with libvirt+KVM+OVS
> is to use a libvirt network wrapped around OVS, as described here:
> >
> > <http://blog.scottlowe.org/2012/11/07/using-vlans-with-ovs-and-libvirt/>
> >
> > --
> > Scott
>
>
>
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