lost and found ( for me ? ): Ubuntu 14:04 : install open vswitch with single interface

Here is how to install/configure openvswitch on Ubuntu 14.04 with single interface

reference

http://blog.allanglesit.com/2012/10/linux-kvm-ubuntu-12-10-with-openvswitch/

http://www.rivy.org/2014/04/install-a-kvm-host-on-ubuntu-14-04-trusty-tahr/

# tail -1 /etc/lsb-release

DISTRIB_DESCRIPTION="Ubuntu 14.04.1 LTS"

# uname -ri

3.13.0-32-generic x86_64

# kvm -version

# libvirtd --version

libvirtd (libvirt) 1.2.2

- before installing openvswitch.

server eth0 --- the internet

- after installing open vswitch

VM1 vnet0 - ovsbr0p1 - ovsbr0 - eth0 --------- the internet

VM2 vnet1

VM3 vnetX

←---------------- server ----------------->

ovsbr0p1 : internal port

ovsbr0 : bridge

eth0 : uplink

vnetX : port for VMs

assign an IP to ovsbr0p1 for the KVM host to use the internet

The KVM host has only one NIC.

install openvswitch. assume that you have already installed KVM.

# apt-get install openvswitch-switch

[ configure network ]

add ovsbr0 bridge and destroy default network.

After issuing “ovs-vsctl add-br ovsbr0”, the network ovsbr0 has been automatically created in KVM. ( virsh net-list --all )

# ovs-vsctl add-br ovsbr0

# virsh net-destroy default

Network default destroyed

# ovs-vsctl show

3e182188-430d-443c-abd3-e5d2e93ac90a

Bridge "ovsbr0"

Port "ovsbr0"

Interface "ovsbr0"

type: internal

ovs_version: "2.0.1"

virsh # net-list --all

Name State Autostart Persistent

----------------------------------------------------------

default inactive yes yes

isolate1 active yes yes

isolate2 active yes yes

isolate3 active yes yes

network1 active yes yes

network2 active yes yes

network3 active yes yes

ovsbr0 inactive no yes

# net-dumpxml ovsbr0

<name>ovsbr0</name>

</network>

undefine default network ( nat network ) and enable ovsbr0 network. ( open vswitch )

virsh # net-undefine default

Network default has been undefined

virsh # net-autostart ovsbr0

Network ovsbr0 marked as autostarted

virsh # net-list --all

Name State Autostart Persistent

----------------------------------------------------------

isolate1 active yes yes

isolate2 active yes yes

isolate3 active yes yes

network1 active yes yes

network2 active yes yes

network3 active yes yes

ovsbr0 inactive yes yes

connect bridge ovsbr0 to its uplink eth0

# ovs-vsctl add-port ovsbr0 eth0

add an internal port ovsbr0p1 connected to bridge ovsbr0

# ovs-vsctl add-port ovsbr0 ovsbr0p1 -- set interface ovsbr0p1 type=internal

edit /etc/network/interfaces.

assign an IP to ovsbr0.

before editing

# cat /etc/network/interfaces.org

# interfaces(5) file used by ifup(8) and ifdown(8)

auto lo

iface lo inet loopback

auto eth0

#iface eth0 inet dhcp

iface eth0 inet static

address 192.168.11.100

netmask 255.255.255.0

gateway 192.168.11.1

dns-nameservers 8.8.4.4 8.8.8.8

# dns-nameservers 127.0.0.1

after editing

assign an IP to ovsbr0p1 for the KVM host to use the internet

# cat /etc/network/interfaces

# interfaces(5) file used by ifup(8) and ifdown(8)

auto lo

iface lo inet loopback

auto eth0

iface eth0 inet manual

up ifconfig $IFACE 0.0.0.0 up

down ifconfig $IFACE down

auto ovsbr0p1

iface ovsbr0p1 inet static

address 192.168.11.100

netmask 255.255.255.0

gateway 192.168.11.1

dns-nameservers 8.8.8.8

dns-search mydomain.local

reboot the OS.

after rebooting the OS.

root@ubuntu:~# virsh net-list

Name State Autostart Persistent

----------------------------------------------------------

isolate1 active yes yes

isolate2 active yes yes

isolate3 active yes yes

network1 active yes yes

network2 active yes yes

network3 active yes yes

ovsbr0 active yes yes

# ip addr show | grep -v 'link/ether'

1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default

link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00

inet 127.0.0.1/8 scope host lo