> On Nov 13, 2017, at 2:12 AM, [email protected] wrote: > > Hi Forum > > I would like to replace the linux bridge installed with libvirt with a > openvswitch bridge, so I can learn about openvswitch. > > I cannot get the VM to communicate with the bridge I create with openvswitch. > > Here is what I did on a vanilla Ubutnu 17.10 Server X86_64 installation. > Installing libvirt and openvswitch. > > PACKAGES="qemu-kvm openvswitch-switch libvirt-bin virtinst virt-manager" > sudo apt-get update > sudo apt-get dist-upgrade -qy > > sudo apt-get install -qy ${PACKAGES} > > sudo adduser `id -un` libvirtd > sudo adduser `id -un` kvm > > I deleted the current linux bridge using > > virsh net-destroy default > virsh net-undefine default > systemctl restart libvirtd > > Created a openvswitch bridge and assigned a IP address. > > ovs-vsctl add-br virbr0 > ip addr add 192.168.122.1/24 dev virbr0 > > I can see the bridge and ip address. > > 5: virbr0: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN group > default qlen 1000 > link/ether 26:68:17:50:25:40 brd ff:ff:ff:ff:ff:ff > inet 192.168.122.1/24 scope global virbr0 > valid_lft forever preferred_lft forever > > I create a VM using virsh-install > > sudo qemu-img create -f qcow2 -o preallocation=metadata > /var/lib/libvirt/images/kvm01.qcow2 10G > > sudo virt-install -n kvm01 \ > --connect qemu:///system \ > --vcpus=2 \ > -r 4096 \ > --os-type linux \ > --os-variant ubuntu16.04 \ > --network=bridge:virbr0,virtualport_type='openvswitch' \ > --vnc --noautoconsole \ > --keymap=en-us \ > --console pty,target_type=serial \ > -f /var/lib/libvirt/images/kvm01.qcow2 \ > --location /var/lib/libvirt/images/ubuntu-16.04.3-server-amd64.iso \ > get_hostname=kvm01 vga=788" > > > When the VM boots I assign a static IP address to 192.168.122.2/24. > Inside the VM the NIC reoprts as > > 2: ens3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast qlen > 1000 > link/ether 52:54:00:a5:53:36 brd ff:ff:ff:ff:ff:ff > inet 192.168.122.2/24 brd 192.168.122.255 scope global ens3 > valid_lft forever preferred_lft forever > inet6 fe80::5254:ff:faa5:5336/64 scope link > valid_lft forever preferred_lft forever > > > When I virsh dumpxml on the VM domain I see the network setup as > <interface type='bridge'> > <mac address='52:54:00:a5:53:36'/> > <source bridge='virbr0'/> > <virtualport type='openvswitch'> > <parameters interfaceid='93b23213-15cb-40bd-b053-a04f15ae395d'/> > </virtualport> > <target dev='vnet0'/> > <model type='virtio'/> > <alias name='net0'/> > <address type='pci' domain='0x0000' bus='0x00' slot='0x03' > function='0x0'/> > </interface> > > From the host machine openswitch reports the vnet0 as an internal port > sudo ovs-vsctl show > 30fdaeff-9867-4651-85a6-5b0bf53f5130 > Bridge "virbr0" > Port "vnet0" > Interface "vnet0" > Port "virbr0" > Interface "virbr0" > type: internal > ovs_version: "2.8.0" > > From the VM I am unable to ping the IP of the bridge. > #ping 192.168.122.1 > > From the host I am also unable to ping the VM > #ping 192.168.122.2 > > I am at my limit of understanding of linux networking and I wonder could > someone point out what I have done wrong here?
There are a couple different ways to integrate Libvirt with virtual networks with Open vSwitch (OVS). Here's one way: <https://blog.scottlowe.org/2012/11/07/using-vlans-with-ovs-and-libvirt/> This doesn't get you the NAT the default Libvirt network uses, but it may be useful nevertheless. Regards, -- Scott
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