Hi Praveen, On Thu, May 13, 2010 at 5:52 PM, Praveen Reguraman <[email protected]> wrote: > Hi Todd, > I mentioned that librvirt also uses a tap interface and hence, > needs some check related to tun module.
I didn't run into this problem with the tun module. Did you install uml-utilities? Also, see below. I did a very quick proof of concept setup of a KVM guest that uses an ovs bridge. >> I'll make an attempt today or tomorrow and try to post a quick howto. >> sudo apt-get install kvm uml-utilities mkdir ~/src cd ~/src wget http://openvswitch.org/releases/openvswitch-0.99.2.tar.gz tar xf openvswitch-0.99.2.tar.gz cd openvswitch-0.99.2/ sudo apt-get install build-essential autoconf automake pkg-config libssl-dev iproute tcpdump linux-headers-`uname -r` ./configure --with-l26=/lib/modules/`uname -r`/build sudo insmod datapath/linux-2.6/openvswitch_mod.ko sudo touch /usr/local/etc/ovs-vswitchd.conf ***In a new terminal window run this command*** sudo ovs-vswitchd --pidfile --log-file --detach -v /usr/local/etc/ovs-vswitchd.conf & ###NOTE, leave this terminal open, debug output will show up here### ***continuing on the original terminal*** sudo /etc/init.d/network-manager stop sudo /etc/init.d/networking stop sudo ifconfig eth0 up sudo ifconfig eth0 0.0.0.0 sudo ovs-vsctl add-br externalbr sudo ovs-vsctl add-port externalbr eth0 #These two will give you a sense of what has been created sudo ovs-dpctl show externalbr sudo ovs-ofctl show externalbr #Just to have the example contained, let's put it in a directory of its own mkdir ~/ovs cd ~/ovs #create two files. In this example, I use cat to create them. cat > externalbr-ifup #!/bin/sh switch='externalbr' /sbin/ifconfig $1 0.0.0.0 up ovs-vsctl add-port ${switch} $1 <CTRL-D> cat > externalbr-ifdown #!/bin/sh # NOTE: This script is intended to run in conjunction with externalbr-ifup # which uses the same logic to find your bridge/switch switch=externalbr ovs-vsctl del-port ${switch} $1 /sbin/ifconfig $1 0.0.0.0 down <CTRL-D> wget http://mirror.clarkson.edu/ubuntu-releases/10.04/ubuntu-10.04-desktop-i386.iso sudo kvm -net nic,macaddr=00:11:22:CC:CC:CC -net tap,script=externalbr-ifup,downscript=externalbr-ifdown -cdrom ~/ubuntu-10.04-desktop-i386.iso & #When running these this time, notice the addition of the tap0, that's the interface given to the kvm guest sudo ovs-dpctl show externalbr sudo ovs-ofctl show externalbr Your newly booted kvm (liveCD) guest will have bridged networking. That concludes this very basic usage of ovs and a KVM guest. In future howtos, I'll look further at things like: sudo ovs-ofctl dump-flows externalbr And other ovs-ofctl actions like: add-flow SWITCH FLOW add flow described by FLOW add-flows SWITCH FILE add flows from FILE del-flows SWITCH [FLOW] delete matching FLOWs Hope that helps. Questions and comments are welcome. Thanks, Todd -- Todd Deshane http://todddeshane.net http://runningxen.com _______________________________________________ discuss mailing list [email protected] http://openvswitch.org/mailman/listinfo/discuss_openvswitch.org
