Open vSwitch and Libvirt
========================

NOTE: You need to have access to the physical machine via serial
      console. With the below commands, connectivity to eth0 will be
      lost:

Install
-------

Install the Open vSwitch package, this is on Fedora 19:

    $ yum install openvswitch -y


Enable the openvswitch systemd unit file, and start the daemon:

    $ systemctl enable openvswitch.service
    $ systemctl start openvswitch.service


Check the status, to ensure the openvswithc service is 'Active':

    $ systemctl status openvswitch.service      


Configure Open vSwitch bridge
-----------------------------


    $ ovs-vsctl add-br ovsbr0
    $ ovs-vsctl add-port ovsbr0 eth0
    $ ifconfig eth0 0.0.0.0
    $ ifconfig ovsbr0 10.65.201.215
    

Run dhclient on the ovsbr0 interface

    $ dhclient ovsbr0 &

 
List the OVS database contents:

    $ ovs-vsctl show
    3dc7f3e3-5872-47c0-ba6f-1cb12065f4d0
        Bridge "ovsbr0"
            Port "eth0"
                Interface "eth0"
            Port "ovsbr0"
                Interface "ovsbr0"
                    type: internal
        ovs_version: "1.10.0"


Edit the libvirt guest XML:

    $ virsh edit f18vm


The <interface> attribute should look as below:

    <interface type='bridge'>
      <mac address='52:54:00:fb:00:01'/>
      <source bridge='ovsbr0'/>
      <virtualport type='openvswitch'/>
      <model type='virtio'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/>
    </interface>


Once saved, it'll appear as below:

    $ virsh dumpxml f18vm | grep bridge -A8
       <interface type='bridge'>
         <mac address='52:54:00:fb:00:01'/>
         <source bridge='ovsbr0'/>
         <virtualport type='openvswitch'>
           <parameters interfaceid='74b6858e-8012-4caa-85c7-b64902a19605'/>
         </virtualport>
         <model type='virtio'/>
         <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/>
       </interface>
       <serial type='pty'>
         <target port='0'/>


Start the guest, and check if it's IP address is on the same subnet as
te hosts':

    $ virsh start fed18vm --console
    $ ifconfig