Re: [libvirt] Notes on configuring Open vSwitch, Linux bridge and Libvirt

Heya Laine, Here's some quick notes to associate libvirt guests to Open vSwitch. Configure Open vSwitch ---------------------- Now that a regular Linux bridge is configured, let's try to configure an OVS brdige and get IP addresses from that space: Create an Open vSwitch bridge device called 'ovsbr', and display the current state of OpenvSwitch database contents: $ ovs-vsctl add-br ovsbr $ ovs-vsctl show Add a virtual ethernet interface called 'veth0' with $ ip link add name veth0 \ type veth peer name veth1 Add 'veth0' ethernet device to the Linux bridge 'br0', and enumerate all bridge devices: $ brctl addif br0 veth0 $ brctl show Now, associate virtual ethernet device 'veth1' to the OVS bridge, and display the current state of OpenvSwitch database contents $ ovs-vsctl add-port ovsbr veth1 $ ovs-vsctl show Bring up both the virtual ethernet interfaces 'veth0' and 'veth1' $ ip link set veth0 up && \ ip link set veth1 up Update libvirt guest's bridge source to OVS ------------------------------------------- Install a minimal Fedora guest with Oz (or any other mechanism): $ wget \ https://github.com/kashyapc/virt-scripts/blob/master/oz/oz-jeos.bash $ ./oz-jeos f19-min f19 Once install is finished, define the guest XML from the current dir: $ virsh define f19-minJul_12_2013-12 Now let's edit libvirt's guest XML file to reflect its bridge source is OVS bridge: $ virsh edit f19-min The contents of the guest XML should reflect something along the below lines: $ virsh dumpxml f19-min | grep bridge -A8 <interface type='bridge'> <mac address='52:54:00:a6:08:70'/> <source bridge='ovsbr'/> <virtualport type='openvswitch'> <parameters interfaceid='ecdff22d-ce80-4ae7-a008-42994415084e'/> </virtualport> <target dev='vnet2'/> <model type='virtio'/> <alias name='net0'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/> </interface> Start the guest, and check the IP of it: $ virsh start f19-jeos --console $ ifconfig eth0 Please note, this is just a simple test, I haven't done any further experiments with VLAN tagging, etc. Slightly verbose notes: http://kashyapc.fedorapeople.org/virt/openvswitch-and-libvirt-kvm.txt