<?xml version='1.0'?> <!--*-nxml-*-->
<?xml-stylesheet type="text/xsl" href="http://docbook.sourceforge.net/release/xsl/current/xhtml/docbook.xsl"?>
<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
- "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
+ "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
<!--
This file is part of systemd.
-->
<refentry id="systemd.link">
- <refentryinfo>
- <title>systemd.link</title>
-
<productname>systemd</productname>
+ <refentryinfo>
+ <title>systemd.link</title>
+ <productname>systemd</productname>
- <contrib>Developer</contrib>
- <firstname>Tom</firstname>
- <surname>Gundersen</surname>
- </author>
- </authorgroup>
- </refentryinfo>
+ <authorgroup>
+ <author>
+ <contrib>Developer</contrib>
+ <firstname>Tom</firstname>
+ <surname>Gundersen</surname>
+ </author>
+ </authorgroup>
+ </refentryinfo>
- <refmeta>
- <refentrytitle>systemd.link</refentrytitle>
- <manvolnum>5</manvolnum>
- </refmeta>
+ <refmeta>
+ <refentrytitle>systemd.link</refentrytitle>
+ <manvolnum>5</manvolnum>
+ </refmeta>
- <refnamediv>
- <refname>systemd.link</refname>
- <refpurpose>Network device configuration</refpurpose>
- </refnamediv>
+ <refnamediv>
+ <refname>systemd.link</refname>
+ <refpurpose>Network device configuration</refpurpose>
+ </refnamediv>
- <refsynopsisdiv>
-
<para><filename><replaceable>link</replaceable>.link</filename></para>
- </refsynopsisdiv>
+ <refsynopsisdiv>
+ <para><filename><replaceable>link</replaceable>.link</filename></para>
+ </refsynopsisdiv>
- <refsect1>
- <title>Description</title>
+ <refsect1>
+ <title>Description</title>
- <para>Network link configuration is performed by the <command>net_setup_link</command>
- udev builtin.</para>
+ <para>Network link configuration is performed by the
+ <command>net_setup_link</command> udev builtin.</para>
- <para>The link files are read from the files located in the
- system network directory <filename>/usr/lib/systemd/network</filename>,
- the volatile runtime network directory <filename>/run/systemd/network</filename>,
- and the local administration network directory <filename>/etc/systemd/network</filename>.
- Link files must have the extension <filename>.link</filename>; other extensions are ignored.
- All link files are collectively sorted and processed in lexical order,
- regardless of the directories in which they live. However, files with
- identical filenames replace each other. Files in <filename>/etc</filename>
- have the highest priority, files in <filename>/run</filename> take precedence
- over files with the same name in <filename>/usr/lib</filename>. This can be
- used to override a system-supplied link file with a local file if needed;
- a symlink in <filename>/etc</filename> with the same name as a link file in
- <filename>/usr/lib</filename>, pointing to <filename>/dev/null</filename>,
- disables the link file entirely.</para>
+ <para>The link files are read from the files located in the system
+ network directory <filename>/usr/lib/systemd/network</filename>,
+ the volatile runtime network directory
+ <filename>/run/systemd/network</filename>, and the local
+ administration network directory
+ <filename>/etc/systemd/network</filename>. Link files must have
+ the extension <filename>.link</filename>; other extensions are
+ ignored. All link files are collectively sorted and processed in
+ lexical order, regardless of the directories in which they live.
+ However, files with identical filenames replace each other. Files
+ in <filename>/etc</filename> have the highest priority, files in
+ <filename>/run</filename> take precedence over files with the same
+ name in <filename>/usr/lib</filename>. This can be used to
+ override a system-supplied link file with a local file if needed;
+ a symlink in <filename>/etc</filename> with the same name as a
+ link file in <filename>/usr/lib</filename>, pointing to
+ <filename>/dev/null</filename>, disables the link file
+ entirely.</para>
- <para>The link file contains a <literal>[Match]</literal> section, which
- determines if a given link file may be applied to a given device; and a
- <literal>[Link]</literal> section specifying how the device should be
- configured. The first (in lexical order) of the link files that matches
- a given device is applied.</para>
- </refsect1>
+ <para>The link file contains a <literal>[Match]</literal> section,
+ which determines if a given link file may be applied to a given
+ device, as well as a <literal>[Link]</literal> section specifying
+ how the device should be configured. The first (in lexical order)
+ of the link files that matches a given device is applied. Note
+ that a default file <filename>99-default.link</filename> is
+ shipped by the system, any user-supplied
+ <filename>.link</filename> should hence have a lexically earlier
+ name to be considered at all.</para>
+ </refsect1>
- <refsect1>
- <title>[Match] Section Options</title>
+ <refsect1>
+ <title>[Match] Section Options</title>
- <para>A link file is said to match a device if each of the entries in the
- <literal>[Match]</literal> section matches, or if the section is empty.
- The following keys are accepted:</para>
+ <para>A link file is said to match a device if each of the entries
+ in the <literal>[Match]</literal> section matches, or if the
+ section is empty. The following keys are accepted:</para>
- <variablelist class='network-directives'>
- <varlistentry>
- <term><varname>MACAddress=</varname></term>
- <listitem>
- <para>The hardware address.</para>
- </listitem>
- </varlistentry>
- <varlistentry>
- <term><varname>Path=</varname></term>
- <listitem>
- <para>The persistent path, as exposed by the
- udev property <literal>ID_PATH</literal>. May
- contain shell style globs.</para>
- </listitem>
- </varlistentry>
- <varlistentry>
- <term><varname>Driver=</varname></term>
- <listitem>
- <para>The driver currently bound to the device,
- as exposed by the udev property <literal>DRIVER</literal>
- of its parent device, or if that is not set, the
- driver as exposed by <literal>ethtool -i</literal>
- of the device itself.</para>
- </listitem>
- </varlistentry>
- <varlistentry>
- <term><varname>Type=</varname></term>
- <listitem>
- <para>The device type, as exposed by the udev
- property <literal>DEVTYPE</literal>.</para>
- </listitem>
- </varlistentry>
- <varlistentry>
- <term><varname>Host=</varname></term>
- <listitem>
- <para>Matches against the hostname or machine
- ID of the host. See <literal>ConditionHost=</literal> in
- <citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>
- for details.</para>
- </listitem>
- </varlistentry>
- <varlistentry>
- <term><varname>Virtualization=</varname></term>
- <listitem>
- <para>Checks whether the system is executed in
- a virtualized environment and optionally test
- whether it is a specific implementation. See
- <literal>ConditionVirtualization=</literal> in
- <citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>
- for details.</para>
- </listitem>
- </varlistentry>
- <varlistentry>
- <term><varname>KernelCommandLine=</varname></term>
- <listitem>
- <para>Checks whether a specific kernel command
- line option is set (or if prefixed with the
- exclamation mark unset). See
- <literal>ConditionKernelCommandLine=</literal> in
- <citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>
- for details.</para>
- </listitem>
- </varlistentry>
- <varlistentry>
- <term><varname>Architecture=</varname></term>
- <listitem>
- <para>Checks whether the system is running on a
- specific architecture. See
- <literal>ConditionArchitecture=</literal> in
- <citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>
- for details.</para>
- </listitem>
- </varlistentry>
- </variablelist>
+ <variablelist class='network-directives'>
+ <varlistentry>
+ <term><varname>MACAddress=</varname></term>
+ <listitem>
+ <para>The hardware address.</para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term><varname>OriginalName=</varname></term>
+ <listitem>
+ <para>A whitespace-separated list of shell-style globs matching
+ the device name, as exposed by the udev property
+ "INTERFACE". This can not be used to match on names that have
+ already been changed from userspace. Caution is advised when matching on
+ kernel-assigned names, as they are known to be unstable
+ between reboots.</para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term><varname>Path=</varname></term>
+ <listitem>
+ <para>A whitespace-separated list of shell-style globs matching
+ the persistent path, as exposed by the udev property
+ <literal>ID_PATH</literal>.</para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term><varname>Driver=</varname></term>
+ <listitem>
+ <para>A whitespace-separated list of shell-style globs matching
+ the driver currently bound to the device,
+ as exposed by the udev property <literal>DRIVER</literal>
+ of its parent device, or if that is not set, the
+ driver as exposed by <literal>ethtool -i</literal>
+ of the device itself.</para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term><varname>Type=</varname></term>
+ <listitem>
+ <para>A whitespace-separated list of shell-style globs matching
+ the device type, as exposed by the udev
+ property <literal>DEVTYPE</literal>.</para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term><varname>Host=</varname></term>
+ <listitem>
+ <para>Matches against the hostname or machine
+ ID of the host. See <literal>ConditionHost=</literal> in
+ <citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>
+ for details.</para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term><varname>Virtualization=</varname></term>
+ <listitem>
+ <para>Checks whether the system is executed in
+ a virtualized environment and optionally test
+ whether it is a specific implementation. See
+ <literal>ConditionVirtualization=</literal> in
+ <citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>
+ for details.</para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term><varname>KernelCommandLine=</varname></term>
+ <listitem>
+ <para>Checks whether a specific kernel command line option
+ is set (or if prefixed with the exclamation mark unset). See
+ <literal>ConditionKernelCommandLine=</literal> in
+ <citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>
+ for details.</para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term><varname>Architecture=</varname></term>
+ <listitem>
+ <para>Checks whether the system is running on a specific
+ architecture. See <literal>ConditionArchitecture=</literal>
+ in
+ <citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>
+ for details.</para>
+ </listitem>
+ </varlistentry>
+ </variablelist>
- </refsect1>
+ </refsect1>
- <refsect1>
- <title>[Link] Section Options</title>
+ <refsect1>
+ <title>[Link] Section Options</title>
-
<para>The <literal>[Link]</literal> section accepts the following
- keys:</para>
+ <para>The <literal>[Link]</literal> section accepts the following
+ keys:</para>
- <variablelist class='network-directives'>
- <varlistentry>
- <term><varname>Description=</varname></term>
- <listitem>
-
<para>A description of the device.</para>
- </listitem>
- </varlistentry>
- <varlistentry>
- <term><varname>Alias=</varname></term>
- <listitem>
- <para>The <literal>ifalias</literal> is set to
- this value.</para>
- </listitem>
- </varlistentry>
- <varlistentry>
- <term><varname>MACAddressPolicy=</varname></term>
- <listitem>
- <para>The policy by which the MAC address
- should be set. The available policies are:
- </para>
+ <variablelist class='network-directives'>
+ <varlistentry>
+ <term><varname>Description=</varname></term>
+ <listitem>
+ <para>A description of the device.</para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term><varname>Alias=</varname></term>
+ <listitem>
+ <para>The <literal>ifalias</literal> is set to this
+ value.</para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term><varname>MACAddressPolicy=</varname></term>
+ <listitem>
+ <para>The policy by which the MAC address should be set. The
+ available policies are:
+ </para>
- <variablelist>
- <varlistentry>
- <term><literal>persistent</literal></term>
- <listitem>
- <para>If the hardware has a persistent
- MAC address, as most hardware should,
- and if it is used by the kernel, nothing
- is done. Otherwise, a new MAC address
- is generated which is guaranteed to be
- the same on every boot for the given
- machine and the given device, but which
- is otherwise random.</para>
- </listitem>
- </varlistentry>
- <varlistentry>
- <term><literal>random</literal></term>
- <listitem>
- <para>If the kernel is using a random MAC
- address, nothing is done. Otherwise, a new
- address is randomly generated each time the
- device appears, typically at boot.</para>
- </listitem>
- </varlistentry>
- </variablelist>
- </listitem>
- </varlistentry>
- <varlistentry>
- <term><varname>MACAddress=</varname></term>
- <listitem>
- <para>The MAC address to use, if no
- <literal>MACAddressPolicy=</literal>
- is specified.</para>
- </listitem>
- </varlistentry>
- <varlistentry>
- <term><varname>NamePolicy=</varname></term>
- <listitem>
- <para>An ordered, space-separated list of
- policies by which the interface name should
- be set. <literal>NamePolicy</literal> may be
- disabled by specifying
- <literal>net.ifnames=0</literal> on the kernel
- commandline. Each of the policies may fail, and
- the first successful one is used. The name is
- not set directly, but is exported to udev as
- the property <literal>ID_NET_NAME</literal>,
- which is, by default, used by a udev rule to set
- <literal>NAME</literal>. The available policies
- are:</para>
+ <variablelist>
+ <varlistentry>
+ <term><literal>persistent</literal></term>
+ <listitem>
+ <para>If the hardware has a persistent MAC address, as
+ most hardware should, and if it is used by the kernel,
+ nothing is done. Otherwise, a new MAC address is
+ generated which is guaranteed to be the same on every
+ boot for the given machine and the given device, but
+ which is otherwise random. This feature depends on ID_NET_NAME_*
+ properties existing for the link, on hardware where these
+ properties are not set the generation of a persistent MAC address
+ will fail.</para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term><literal>random</literal></term>
+ <listitem>
+ <para>If the kernel is using a random MAC address,
+ nothing is done. Otherwise, a new address is randomly
+ generated each time the device appears, typically at
+ boot.</para>
+ </listitem>
+ </varlistentry>
+ </variablelist>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term><varname>MACAddress=</varname></term>
+ <listitem>
+ <para>The MAC address to use, if no
+ <literal>MACAddressPolicy=</literal>
+ is specified.</para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term><varname>NamePolicy=</varname></term>
+ <listitem>
+ <para>An ordered, space-separated list of policies by which
+ the interface name should be set.
+ <literal>NamePolicy</literal> may be disabled by specifying
+ <literal>net.ifnames=0</literal> on the kernel command line.
+ Each of the policies may fail, and the first successful one
+ is used. The name is not set directly, but is exported to
+ udev as the property <literal>ID_NET_NAME</literal>, which
+ is, by default, used by a udev rule to set
+ <literal>NAME</literal>. If the name has already been set by
+ userspace, no renaming is performed. The available policies
+ are:</para>
- <variablelist>
- <varlistentry>
- <term><literal>database</literal></term>
- <listitem>
- <para>The name is set based on entries in
- the udev's Hardware Database with the key
- <literal>ID_NET_NAME_FROM_DATABASE</literal>.
- </para>
- </listitem>
- </varlistentry>
- <varlistentry>
- <term><literal>onboard</literal></term>
- <listitem>
- <para>The name is set based on information given by
- the firmware for on-board devices, as exported by
- the udev property <literal>ID_NET_NAME_ONBOARD</literal>.
- </para>
- </listitem>
- </varlistentry>
- <varlistentry>
- <term><literal>slot</literal></term>
- <listitem>
- <para>The name is set based on information given by
- the firmware for hot-plug devices, as exported by
- the udev property <literal>ID_NET_NAME_SLOT</literal>.
- </para>
- </listitem>
- </varlistentry>
- <varlistentry>
- <term><literal>path</literal></term>
- <listitem>
- <para>The name is set based on the device's physical
- location, as exported by the udev property
- <literal>ID_NET_NAME_PATH</literal>.</para>
- </listitem>
- </varlistentry>
- <varlistentry>
- <term><literal>mac</literal></term>
- <listitem>
- <para>The name is set based on the device's
- persistent MAC address, as exported by the udev
- property <literal>ID_NET_NAME_MAC</literal>.</para>
- </listitem>
- </varlistentry>
- </variablelist>
- </listitem>
- </varlistentry>
- <varlistentry>
- <term><varname>Name=</varname></term>
- <listitem>
- <para>The interface name to use in case all the
- policies specified in
- <varname>NamePolicy=</varname> fail, or in case
- <varname>NamePolicy=</varname> is missing or
- disabled.</para>
- </listitem>
- </varlistentry>
- <varlistentry>
- <term><varname>MTUBytes=</varname></term>
- <listitem>
- <para>The maximum transmission unit in bytes to
- set for the device. The usual suffixes K, M, G,
- are supported and are understood to the base of
- 1024.</para>
- </listitem>
- </varlistentry>
- <varlistentry>
- <term><varname>BitsPerSecond=</varname></term>
- <listitem>
- <para>The speed to set for the device, the
- value is rounded down to the nearest Mbps.
- The usual suffixes K, M, G, are supported and
- are understood to the base of 1000.</para>
- </listitem>
- </varlistentry>
- <varlistentry>
- <term><varname>Duplex=</varname></term>
- <listitem>
- <para>The duplex mode to set for the device.
- The accepted values are <literal>half</literal>
- and <literal>full</literal>.</para>
- </listitem>
- </varlistentry>
- <varlistentry>
- <term><varname>WakeOnLan=</varname></term>
- <listitem>
- <para>The Wake-on-LAN policy to set for the
- device. The supported values are:</para>
+ <variablelist>
+ <varlistentry>
+ <term><literal>kernel</literal></term>
+ <listitem>
+ <para>If the kernel claims that the name it has set
+ for a device is predictable, then no renaming is
+ performed.</para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term><literal>database</literal></term>
+ <listitem>
+ <para>The name is set based on entries in the udev's
+ Hardware Database with the key
+ <literal>ID_NET_NAME_FROM_DATABASE</literal>.
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term><literal>onboard</literal></term>
+ <listitem>
+ <para>The name is set based on information given by
+ the firmware for on-board devices, as exported by the
+ udev property <literal>ID_NET_NAME_ONBOARD</literal>.
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term><literal>slot</literal></term>
+ <listitem>
+ <para>The name is set based on information given by
+ the firmware for hot-plug devices, as exported by the
+ udev property <literal>ID_NET_NAME_SLOT</literal>.
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term><literal>path</literal></term>
+ <listitem>
+ <para>The name is set based on the device's physical
+ location, as exported by the udev property
+ <literal>ID_NET_NAME_PATH</literal>.</para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term><literal>mac</literal></term>
+ <listitem>
+ <para>The name is set based on the device's persistent
+ MAC address, as exported by the udev property
+ <literal>ID_NET_NAME_MAC</literal>.</para>
+ </listitem>
+ </varlistentry>
+ </variablelist>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term><varname>Name=</varname></term>
+ <listitem>
+ <para>The interface name to use in case all the
+ policies specified in
+ <varname>NamePolicy=</varname> fail, or in case
+ <varname>NamePolicy=</varname> is missing or
+ disabled.</para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term><varname>MTUBytes=</varname></term>
+ <listitem>
+ <para>The maximum transmission unit in bytes to set for the
+ device. The usual suffixes K, M, G, are supported and are
+ understood to the base of 1024.</para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term><varname>BitsPerSecond=</varname></term>
+ <listitem>
+ <para>The speed to set for the device, the value is rounded
+ down to the nearest Mbps. The usual suffixes K, M, G, are
+ supported and are understood to the base of 1000.</para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term><varname>Duplex=</varname></term>
+ <listitem>
+ <para>The duplex mode to set for the device. The accepted
+ values are <literal>half</literal> and
+ <literal>full</literal>.</para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term><varname>WakeOnLan=</varname></term>
+ <listitem>
+ <para>The Wake-on-LAN policy to set for the device. The
+ supported values are:</para>
- <variablelist>
- <varlistentry>
- <term><literal>phy</literal></term>
- <listitem>
-
<para>Wake on PHY activity.</para>
- </listitem>
- </varlistentry>
- <varlistentry>
- <term><literal>magic</literal></term>
- <listitem>
-
<para>Wake on receipt of a magic packet.
- </para>
- </listitem>
- </varlistentry>
- <varlistentry>
- <term><literal>off</literal></term>
- <listitem>
-
<para>Never wake.</para>
- </listitem>
- </varlistentry>
- </variablelist>
- </listitem>
- </varlistentry>
- </variablelist>
- </refsect1>
+ <variablelist>
+ <varlistentry>
+ <term><literal>phy</literal></term>
+ <listitem>
+ <para>Wake on PHY activity.</para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term><literal>magic</literal></term>
+ <listitem>
+ <para>Wake on receipt of a magic packet.
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term><literal>off</literal></term>
+ <listitem>
+ <para>Never wake.</para>
+ </listitem>
+ </varlistentry>
+ </variablelist>
+ </listitem>
+ </varlistentry>
+ </variablelist>
+ </refsect1>
- <refsect1>
- <title>Example</title>
- <example>
- <title>/etc/systemd/network/wireless.link</title>
+ <refsect1>
+ <title>Example</title>
+ <example>
+ <title>/etc/systemd/network/wireless.link</title>
-
<programlisting>[Match]
+ <programlisting>[Match]
MACAddress=12:34:56:78:9a:bc
Driver=brcmsmac
Path=pci-0000:02:00.0-*
BitsPerSecond=10M
WakeOnLan=magic
MACAddress=cb:a9:87:65:43:21</programlisting>
- </example>
- </refsect1>
+ </example>
+ </refsect1>
- <refsect1>
- <title>See Also</title>
- <para>
- <citerefentry>
- <refentrytitle>systemd-udevd.service</refentrytitle><manvolnum>8</manvolnum>
- </citerefentry>,
- <citerefentry>
- <refentrytitle>udevadm</refentrytitle><manvolnum>8</manvolnum>
- </citerefentry>
- </para>
- </refsect1>
+ <refsect1>
+ <title>See Also</title>
+ <para>
+ <citerefentry>
+ <refentrytitle>systemd-udevd.service</refentrytitle><manvolnum>8</manvolnum>
+ </citerefentry>,
+ <citerefentry>
+ <refentrytitle>udevadm</refentrytitle><manvolnum>8</manvolnum>
+ </citerefentry>,
+ <citerefentry>
+ <refentrytitle>systemd.netdev</refentrytitle><manvolnum>5</manvolnum>
+ </citerefentry>,
+ <citerefentry>
+ <refentrytitle>systemd.network</refentrytitle><manvolnum>5</manvolnum>
+ </citerefentry>
+ </para>
+ </refsect1>
</refentry>
~ianmdlvl / elogind.git / blobdiff