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man: networkd - document bridging
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Tom Gundersen
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@ -58,7 +58,8 @@
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<para><command>systemd-networkd</command> is a system
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service that manages networks. It detects and configures
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network devices as they appear.</para>
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network devices as they appear, as well as creating virtual
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network devices.</para>
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<para>Network configurations applied before networkd is started
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are not removed, and configuration applied by networkd are not
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@ -68,118 +69,148 @@
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and back.</para>
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</refsect1>
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<refsect1><title>Network Configuration</title>
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<para>The network files are read from the files located in the
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<refsect1><title>Configuration Files</title>
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<para>The configuration files are read from the files located in the
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system network directory <filename>/usr/lib/systemd/network</filename>,
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the volatile runtime network directory
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<filename>/run/systemd/network</filename> and the local administration
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network directory <filename>/etc/systemd/network</filename>.
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All link files are collectively sorted and processed in lexical order,
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All configuration files are collectively sorted and processed in lexical order,
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regardless of the directories in which they live. However, files with
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identical filenames replace each other. Files in
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<filename>/etc</filename> have the highest priority, files in
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<filename>/run</filename> take precedence over files with the same
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name in <filename>/lib</filename>. This can be used to override a
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system-supplied network file with a local file if needed; a symlink in
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<filename>/etc</filename> with the same name as a network file in
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system-supplied configuration file with a local file if needed; a symlink in
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<filename>/etc</filename> with the same name as a configuration file in
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<filename>/lib</filename>, pointing to <filename>/dev/null</filename>,
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disables the network file entirely. Network files must have the extension
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<filename>.network</filename>; other extensions are ignored.</para>
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disables the configuration file entirely.</para>
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<para>The network file contains a <literal>[Match]</literal> section,
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which determines if a given network file may be applied to a given device;
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and a <literal>[Network]</literal> section specifying how the device should
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be configured. The first (in lexical order) of the network files that
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matches a given device is applied.</para>
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<refsect2><title>Virtual Network Devices</title>
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<para>Netdev files must have the extension <filename>.netdev</filename>;
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other extensions are ignored. Virtual network devices are created as soon
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as networkd is started.</para>
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<para>A network file is said to match a device if each of the entries in the
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<literal>[Match]</literal> section matches, or if the section is empty.
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The following keys are accepted:</para>
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<para>The <literal>[Bridge]</literal> section accepts the following
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keys:</para>
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<variablelist class='network-directives'>
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<varlistentry>
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<term><varname>MACAddress</varname></term>
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<listitem>
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<para>The hardware address.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>Path</varname></term>
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<listitem>
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<para>The persistent path, as exposed by the udev
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property <literal>ID_PATH</literal>.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>Driver</varname></term>
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<listitem>
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<para>The driver currently bound to the device, as
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exposed by the udev property <literal>DRIVER</literal>.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>Type</varname></term>
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<listitem>
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<para>The device type, as exposed by the udev property
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<literal>DEVTYPE</literal>.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>Name</varname></term>
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<listitem>
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<para>The device name, as exposed by the udev property
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<literal>INTERFACE</literal>.</para>
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</listitem>
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</varlistentry>
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</variablelist>
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<variablelist class='network-directives'>
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<varlistentry>
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<term><varname>Name</varname></term>
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<listitem>
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<para>The interface name used when creating the
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bridge. This option is compulsory.</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</refsect2>
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<para>The <literal>[Network]</literal> section accepts the following keys:</para>
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<refsect2><title>Networks</title>
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<para>Network files must have the extension <filename>.network</filename>;
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other extensions are ignored. Networks are applied to links whenever the links
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appear.</para>
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<variablelist class='network-directives'>
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<varlistentry>
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<term><varname>Description</varname></term>
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<listitem>
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<para>A description of the device. This is only used for
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presentation purposes.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>Address</varname></term>
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<listitem>
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<para>A static IPv4 or IPv6 address and its prefix length,
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separated by a '/' character. The format of the address must
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be as described in
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<citerefentry><refentrytitle>inet_pton</refentrytitle><manvolnum>3</manvolnum></citerefentry>
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.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>Gateway</varname></term>
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<listitem>
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<para>The gateway address, which must be in the format described in
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<citerefentry><refentrytitle>inet_pton</refentrytitle><manvolnum>3</manvolnum></citerefentry>
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.</para>
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</listitem>
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</varlistentry>
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</variablelist>
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<para>The network file contains a <literal>[Match]</literal> section,
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which determines if a given network file may be applied to a given device;
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and a <literal>[Network]</literal> section specifying how the device should
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be configured. The first (in lexical order) of the network files that
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matches a given device is applied.</para>
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<para>The <literal>[Address]</literal> section accepts the following keys:</para>
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<para>A network file is said to match a device if each of the entries in the
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<literal>[Match]</literal> section matches, or if the section is empty.
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The following keys are accepted:</para>
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<variablelist class='network-directives'>
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<varlistentry>
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<term><varname>Address</varname></term>
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<listitem>
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<para>As in the <literal>[Network]</literal> section.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>Label</varname></term>
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<listitem>
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<para>An address label.</para>
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</listitem>
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</varlistentry>
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</variablelist>
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<variablelist class='network-directives'>
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<varlistentry>
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<term><varname>MACAddress</varname></term>
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<listitem>
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<para>The hardware address.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>Path</varname></term>
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<listitem>
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<para>The persistent path, as exposed by the udev
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property <literal>ID_PATH</literal>.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>Driver</varname></term>
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<listitem>
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<para>The driver currently bound to the device, as
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exposed by the udev property <literal>DRIVER</literal>.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>Type</varname></term>
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<listitem>
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<para>The device type, as exposed by the udev property
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<literal>DEVTYPE</literal>.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>Name</varname></term>
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<listitem>
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<para>The device name, as exposed by the udev property
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<literal>INTERFACE</literal>.</para>
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</listitem>
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</varlistentry>
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</variablelist>
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<para>The <literal>[Network]</literal> section accepts the following keys:</para>
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<variablelist class='network-directives'>
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<varlistentry>
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<term><varname>Description</varname></term>
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<listitem>
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<para>A description of the device. This is only used for
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presentation purposes.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>Address</varname></term>
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<listitem>
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<para>A static IPv4 or IPv6 address and its prefix length,
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separated by a '/' character. The format of the address must
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be as described in
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<citerefentry><refentrytitle>inet_pton</refentrytitle><manvolnum>3</manvolnum></citerefentry>
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.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>Gateway</varname></term>
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<listitem>
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<para>The gateway address, which must be in the format described in
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<citerefentry><refentrytitle>inet_pton</refentrytitle><manvolnum>3</manvolnum></citerefentry>
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.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>Bridge</varname></term>
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<listitem>
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<para>The name of the bridge to add the configured link to.</para>
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</listitem>
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</varlistentry>
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</variablelist>
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<para>The <literal>[Address]</literal> section accepts the following keys:</para>
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<variablelist class='network-directives'>
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<varlistentry>
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<term><varname>Address</varname></term>
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<listitem>
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<para>As in the <literal>[Network]</literal> section.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>Label</varname></term>
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<listitem>
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<para>An address label.</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</refsect2>
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</refsect1>
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<refsect1>
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