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

Scott Lowe scott.lowe at scottlowe.org
Mon Oct 5 19:04:58 UTC 2015


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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