mirror of
https://gitlab.freedesktop.org/NetworkManager/NetworkManager
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196 lines
8.6 KiB
XML
196 lines
8.6 KiB
XML
<?xml version='1.0'?>
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<?xml-stylesheet type="text/xsl" href="http://docbook.sourceforge.net/release/xsl/current/xhtml/docbook.xsl"?>
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<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
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"http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
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<!ENTITY % entities SYSTEM "common.ent" >
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%entities;
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]>
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<!--
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SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later
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nm-openvswitch(7) manual page
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Copyright 2017 Red Hat, Inc.
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-->
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<refentry id="nm-openvswitch">
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<refentryinfo>
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<title>nm-openvswitch</title>
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<author>NetworkManager Open vSwitch support</author>
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</refentryinfo>
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<refmeta>
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<refentrytitle>nm-openvswitch</refentrytitle>
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<manvolnum>7</manvolnum>
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<refmiscinfo class="source">NetworkManager</refmiscinfo>
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<refmiscinfo class="manual">Open vSwitch support overview</refmiscinfo>
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<refmiscinfo class="version">&NM_VERSION;</refmiscinfo>
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</refmeta>
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<refnamediv>
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<refname>nm-openvswitch</refname>
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<refpurpose>overview of NetworkManager Open vSwitch support</refpurpose>
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</refnamediv>
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<refsect1>
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<title>Overview</title>
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<para>NetworkManager includes basic Open vSwitch support, good enough
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to be capable of setting up simple Open vSwitch configurations. It is not
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extensive and does not expose all functionality of Open vSwitch provides.
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For large or complicated deployments users are advised to use native tools
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shipped with Open vSwitch. This document seeks to provide overview of
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functionality currently provided by NetworkManager, its capabilities and
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limitations.</para>
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<para>First and foremost: NetworkManager applies the configuration by
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modifying the OVSDB directly. Its configuration model follows the OVSDB
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database model closely and it does not provide the level of abstraction
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<command>ovs-vsctl</command> provides.</para>
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<para>In practical terms it means the following:
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<itemizedlist>
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<listitem>
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<para>NetworkManager only ever talks to a single OVSDB instance via an
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UNIX domain socket.</para>
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</listitem>
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<listitem>
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<para>The configuration is made up of Bridges, Ports and
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Interfaces. Interfaces are always enslaved to Ports, and Ports are always
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enslaved to Bridges.</para>
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</listitem>
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<listitem>
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<para>NetworkManager only creates Bridges, Ports and Interfaces
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you ask it to. Unlike <command>ovs-vsctl</command>, it doesn't create the
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local interface nor its port automatically.</para>
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</listitem>
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<listitem>
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<para>You can't enslave Interface directly to a Bridge. You
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always need a Port, even if it has just one interface.</para>
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</listitem>
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<listitem>
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<para>There are no VLANs. The VLAN tagging is enabled by setting a
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<link linkend="nm-settings.property.ovs-port.tag">ovs-port.tag</link>
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property on a Port.</para>
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</listitem>
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<listitem>
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<para>There are no bonds either. The bonding is enabled by
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enslaving multiple Interfaces to a Port and configured by setting
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properties on a port.</para>
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</listitem>
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</itemizedlist>
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</para>
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<refsect2>
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<title>Bridges</title>
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<para>Bridges are represented by connections of ovs-bridge
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<link linkend="nm-settings.property.connection.type">type</link>.
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Due to the limitations of OVSDB, "empty" Bridges (with no Ports) can't exist.
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NetworkManager inserts the records for Bridges into OVSDB when a Port is
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enslaved.
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</para>
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</refsect2>
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<refsect2>
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<title>Ports</title>
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<para>Ports are represented by connections of ovs-port
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<link linkend="nm-settings.property.connection.type">type</link>.
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Due to the limitations of OVSDB, "empty" Ports (with no Interfaces) can't
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exist. Ports can also be configured to do VLAN tagging or Bonding.
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NetworkManager inserts the records for Ports into OVSDB when an Interface is
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enslaved. Ports must be enslaved to a Bridge.</para>
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</refsect2>
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<refsect2>
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<title>Interfaces</title>
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<para>Interfaces are represented by a connections enslaved to a Port. The
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system interfaces (that have a corresponding Linux link) have a respective
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<link linkend="nm-settings.property.connection.type">connection.type</link>
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of the link (e.g. "wired", "bond", "dummy", etc.). Other interfaces ("internal"
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or "patch" interfaces) are of ovs-interface type. The OVSDB entries are
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inserted upon enslavement to a Port.</para>
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</refsect2>
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</refsect1>
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<refsect1>
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<title>Examples</title>
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<example><title>Creating a Bridge with a single internal Interface</title>
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<screen><prompt>$ </prompt><userinput>nmcli conn add type ovs-bridge conn.interface bridge0</userinput>
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Connection 'ovs-bridge-bridge0' (d10fc64d-1d48-4394-a1b8-e1aea72f27d5) successfully added.
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<prompt>$ </prompt><userinput>nmcli conn add type ovs-port conn.interface port0 master bridge0</userinput>
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Connection 'ovs-port-port0' (5ae22bae-bba4-4815-9ade-7e635633e1f0) successfully added.
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<prompt>$ </prompt><userinput>nmcli conn add type ovs-interface slave-type ovs-port conn.interface iface0 \
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master port0 ipv4.method manual ipv4.address 192.0.2.1/24</userinput>
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Connection 'ovs-interface-iface0' (3640d2a1-a2fd-4718-92f1-cffadb5b6cdc) successfully added.
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</screen>
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<para>As said above, you need to create a Port even for a single interface.
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Also, before you add the Interface, the Bridge and Port devices appear active,
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but are not configured in OVSDB yet. You can inspect the results with
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<command>ovs-vsctl show</command>.</para>
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</example>
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<example><title>Adding a Linux interface to a Bridge</title>
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<screen><prompt>$ </prompt><userinput>nmcli conn add type ovs-port conn.interface port1 master bridge0</userinput>
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Connection 'ovs-port-port1' (67d041eb-8e7b-4458-afee-a1d07c9c4552) successfully added.
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<prompt>$ </prompt><userinput>nmcli conn add type ethernet conn.interface eth0 master port1</userinput>
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Connection 'ovs-slave-eth0' (d459c45c-cf78-4c1c-b4b7-505e71379624) successfully added.
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</screen>
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<para>Again, you need a port.</para>
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</example>
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<example><title>Creating a VLAN</title>
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<screen><prompt>$ </prompt><userinput>nmcli conn add type ovs-port conn.interface port2 master bridge0 ovs-port.tag 120</userinput>
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Connection 'ovs-port-port2' (3994c093-4ef7-4549-a4fd-627b831c3cb8) successfully added.
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<prompt>$ </prompt><userinput>nmcli conn add type ethernet conn.interface eth1 master port2</userinput>
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Connection 'ovs-slave-eth1' (099be06e-71ad-484d-8d5a-fcadc5f207f5) successfully added.
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</screen>
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<para>It's just a port with a tag.</para>
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</example>
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<example><title>Creating a Bond</title>
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<screen><prompt>$ </prompt><userinput>nmcli conn add type ovs-port conn.interface bond0 master bridge0</userinput>
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Connection 'ovs-port-bond0' (d154ebf9-e999-4e1b-a084-a3de53d25d8a) successfully added.
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<prompt>$ </prompt><userinput>nmcli conn add type ethernet conn.interface eth2 master bond0</userinput>
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Connection 'ovs-slave-eth2' (475ac1bf-30b2-4534-a877-27f33f58b082) successfully added.
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<prompt>$ </prompt><userinput>nmcli conn add type ethernet conn.interface eth3 master bond0</userinput>
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Connection 'ovs-slave-eth3' (8dedeecb-ed12-482b-b77a-24a4fb835136) successfully added.
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</screen>
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<para>It's just a Port with multiple interfaces. See nm-settings-nmcli manual for
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Bonding options you can use with "nmcli c add" or "nmcli c modify". You could
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even set a VLAN tag on the same Port to do VLAN tagging and bonding at the same
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time.</para>
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</example>
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</refsect1>
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<refsect1>
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<title>Bugs</title>
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<itemizedlist>
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<listitem>
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<para>Not all Open vSwitch capabilities are supported.</para>
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</listitem>
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<listitem>
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<para>Open vSwitch devices don't expose many useful properties on D-Bus.</para>
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</listitem>
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</itemizedlist>
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<para>Probably many more.</para>
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</refsect1>
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<refsect1>
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<title>See Also</title>
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<para>
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<ulink url="https://www.rfc-editor.org/rfc/rfc7047.txt">RFC 7047: The Open vSwitch Database Management Protocol</ulink>,
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<citerefentry><refentrytitle>ovs-vsctl</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>ovs-vswitchd.conf.db</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
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<link linkend='nm-settings-nmcli'><citerefentry><refentrytitle>nm-settings-nmcli</refentrytitle><manvolnum>5</manvolnum></citerefentry></link>,
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<link linkend='nmcli'><citerefentry><refentrytitle>nmcli</refentrytitle><manvolnum>1</manvolnum></citerefentry></link>
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</para>
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</refsect1>
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</refentry>
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