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8499649a5f
-Uprev to 1.10 -removed vswitch_test.sh -added openvswitch.txt. Signed-off-by: Paul Barrette <paul.barrette@windriver.com> Signed-off-by: Bruce Ashfield <bruce.ashfield@windriver.com>
97 lines
3.0 KiB
Plaintext
97 lines
3.0 KiB
Plaintext
Simple setup for connecting openvswitch to qemu/kvm
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===================================================
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This example brings up openvswitch using a private network.
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Preliminary notes
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=================
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1. Make sure to build kernel support for openvswitch as a module. The
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openvswitch init scripts expect to load a module and upon success
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continue to setup the switch. If openvswitch is compiled
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statically, the init scripts not load the ovs-vswitchd daemon
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and none of the configured bridges will show up in the interfaces
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table (ifconfig). You can get around this limiation by running the
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following by hand:
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# ovs-vswitchd --pidfile --detach
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2. Verify that ovs-vswitchd is running before proceeding:
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# /etc/init.d/openvswitch-switch status
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ovsdb-server is running with pid 1867
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ovs-vswitchd is running with pid 1877
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3. A kernel and rootfs is required for qemu bring up.
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Qemu Setup
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==========
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The host requires a /etc/qemu-ifup script to setup the bridging and tap
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devices. Qemu will invoke this qemu-ifup script at startup. Here is
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an example script:
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$ cat /etc/qemu-fup
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#!/bin/sh
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# the tap is dynamically assigned and passed into this script
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# as a parameter
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TAP=$1
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# Note: if booting over NFS, once the $ETH0 device is added to the bridge,
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# your host will be unusable. In that case, setup networking
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# init scripts appropriately and change the following to work
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# with it.
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ETH0="eth1"
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NETMASK=255.255.255.0
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IP=192.168.1.1
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GATEWAY=
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SWITCH=ovsbr0
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if [ -n "$TAP" ];then
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ifconfig $TAP up
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ifconfig $SWITCH down &>/dev/null
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ovs-vsctl del-br $SWITCH
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ovs-vsctl add-br $SWITCH
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ifconfig $ETH0 0.0.0.0
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ifconfig $SWITCH $IP up netmask $NETMASK
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#-- external access not required for this test.
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#route add default gw $GATEWAY
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ovs-vsctl add-port $SWITCH $ETH0
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ovs-vsctl add-port $SWITCH $TAP
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exit 0
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else
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echo "$0: No tap device"
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exit 1
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fi
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Start Qemu
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==========
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This example will bring up qemu with a tap network interface.
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Note: this command must be run as root due to the networking setup.
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$ qemu-system-x86_64 -nographic -k en-us -m 1024 \
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-net nic,macaddr=1a:46:0b:ca:bc:7a,model=virtio \
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-net tap -enable-kvm\
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-kernel /opt/dpdk-guest-kernel \
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-append 'root=/dev/vda ro console=ttyS0' \
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-drive file=/opt/intel-xeon-core-ovp-kvm-preempt-rt-dist.ext3,cache=none,if=virtio
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Once the guest OS is up and running, configure the quest network interface:
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$ ifconfig eth0 192.168.1.10
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Ping the bridge:
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$ ping 192.168.1.1
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From the host, view the bridged network:
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$ ovs-vsctl show
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c1212b96-ef49-4a8e-b598-09b05b854dd0
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Bridge "ovsbr0"
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Port "tap0"
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Interface "tap0"
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Port "eth1"
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Interface "eth1"
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Port "ovsbr0"
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Interface "ovsbr0"
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type: internal
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At this point, openvswitch is up and running. If you want external
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network access, you need to set a GATEWAY in the qemu-ifup script and
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make sure the external device is part of the bridge.
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Note:
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Proper setup will require a /etc/qemu-ifdown script to tear down the
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bridge and interfaces. (not provided here).
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