Ovs Tutorials and theory

ovs-vsctl

Ovs-- Open Virtual Switch
#########################

#################################
#  Debian Installation of OVS   #
#################################

apt-get update
apt-get install openvswitch-controller openvswitch-switch openvswitch-datapath-source

##################################
#     Create Network Bridge      #
##################################

## Adds a bridge inside the instance
ovs-vsctl add-br ovsbr0

## Adds a port to the bridge to eth interface
ovs-vsctl add-port ovsbr0 eth0


################################################
# Network interface setup to enable the bridge #
################################################

# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).

auto lo
# The loopback network interface
iface lo inet loopback

# eth0
auto eth0
allow-hotplug eth0
iface eth0 inet static
        address 0.0.0.0
#       netmask 255.255.255.192
#       post-up route add -net 10.0.0.0 netmask 255.0.0.0 gw 10.106.135.65

#ovsbr0
auto ovsbr0
iface ovsbr0 inet static
    address 10.106.135.86
    netmask 255.255.255.192
    post-up route add -net 10.0.0.0 netmask 255.0.0.0 gw 10.106.135.65
    bridge_ports eth0
    bridge_stp off
# eth1
auto eth1
allow-hotplug eth1
iface eth1 inet static
        address 192.155.236.3
        netmask 255.255.255.240
        gateway 192.155.236.1


'''''
Common options inside an interface stanza:

address – IP address for a static IP configured interface

netmask – netmask

gateway – The default gateway of a server. Be careful to use only one of this guy.

vlan-raw-device – On a VLAN interface, defines its "father".

bridge_ports – On a bridge interface, define its members.

down – Use the following command to down the interface instead of ifdown.

post-down – Actions taken right after the interface is down.

pre-up – Actions before the interface is up.

up – Use the following command to up the interface instead of ifup


################################################
#     Ovs Gre Tunnel Setup
# 
################################################

On Server1

sudo ovs-vsctl add-br br1
sudo ovs-vsctl add-br br2
sudo ovs-vsctl add-port br1 eth0
sudo ifconfig br1 $eth0ip netmask $eth0netmask
sudo ifconfig br2 10.1.1.1 netmask 255.255.255.0
sudo ovs-vsctl add-port br2 gre0 -- set interface gre0 type=gre options:remote_ip=$server2 ip

On Server2

sudo ovs-vsctl add-br br1
sudo ovs-vsctl add-br br2
sudo ovs-vsctl add-port br1 eth0
sudo ifconfig br1 $eth0ip netmask $eth0netmask
sudo ifconfig br2 10.1.1.1 netmask 255.255.255.0
sudo ovs-vsctl add-port br2 gre0 -- set interface gre0 type=gre options:remote_ip=$server1 ip




######################
# Ovs Db based commands
######################

ovsdb-client: Open vSwitch database JSON-RPC client
usage: ovsdb-client [OPTIONS] COMMAND [ARG...]

Valid commands are:

  list-dbs [SERVER]
    list databases available on SERVER

  get-schema [SERVER] [DATABASE]
    retrieve schema for DATABASE from SERVER

  get-schema-version [SERVER] [DATABASE]
    retrieve schema for DATABASE from SERVER and report only its
    version number on stdout

  list-tables [SERVER] [DATABASE]
    list tables for DATABASE on SERVER

  list-columns [SERVER] [DATABASE] [TABLE]
    list columns in TABLE (or all tables) in DATABASE on SERVER

  transact [SERVER] TRANSACTION
    run TRANSACTION (a JSON array of operations) on SERVER
    and print the results as JSON on stdout

  monitor [SERVER] [DATABASE] TABLE [COLUMN,...]...
    monitor contents of COLUMNs in TABLE in DATABASE on SERVER.
    COLUMNs may include !initial, !insert, !delete, !modify
    to avoid seeing the specified kinds of changes.

  dump [SERVER] [DATABASE]
    dump contents of DATABASE on SERVER to stdout

The default SERVER is unix:/var/run/openvswitch/db.sock.
The default DATABASE is Open_vSwitch.