[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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