mirror of
https://github.com/systemd/systemd.git
synced 2024-12-14 04:33:37 +08:00
386 lines
22 KiB
XML
386 lines
22 KiB
XML
<?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">
|
|
|
|
<!--
|
|
This file is part of systemd.
|
|
|
|
Copyright 2014 Tom Gundersen
|
|
|
|
systemd is free software; you can redistribute it and/or modify it
|
|
under the terms of the GNU Lesser General Public License as published by
|
|
the Free Software Foundation; either version 2.1 of the License, or
|
|
(at your option) any later version.
|
|
|
|
systemd is distributed in the hope that it will be useful, but
|
|
WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public License
|
|
along with systemd; If not, see <http://www.gnu.org/licenses/>.
|
|
-->
|
|
|
|
<refentry id="systemd.link">
|
|
<refentryinfo>
|
|
<title>systemd.link</title>
|
|
<productname>systemd</productname>
|
|
|
|
<authorgroup>
|
|
<author>
|
|
<contrib>Developer</contrib>
|
|
<firstname>Tom</firstname>
|
|
<surname>Gundersen</surname>
|
|
</author>
|
|
</authorgroup>
|
|
</refentryinfo>
|
|
|
|
<refmeta>
|
|
<refentrytitle>systemd.link</refentrytitle>
|
|
<manvolnum>5</manvolnum>
|
|
</refmeta>
|
|
|
|
<refnamediv>
|
|
<refname>systemd.link</refname>
|
|
<refpurpose>Network device configuration</refpurpose>
|
|
</refnamediv>
|
|
|
|
<refsynopsisdiv>
|
|
<para><filename><replaceable>link</replaceable>.link</filename></para>
|
|
</refsynopsisdiv>
|
|
|
|
<refsect1>
|
|
<title>Description</title>
|
|
|
|
<para>Network link configuration is performed by the <literal>net_setup_link</literal>
|
|
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 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>
|
|
|
|
<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>
|
|
|
|
<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>
|
|
<varlistentry>
|
|
<term><literal>persistent</literal></term>
|
|
<listitem>
|
|
<para>If the hardware has a persistent
|
|
MAC address, as most hardware should,
|
|
and this 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>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>
|
|
|
|
<refsect1>
|
|
<title>Example</title>
|
|
<example>
|
|
<title>/etc/systemd/network/bridge.netdev</title>
|
|
|
|
<programlisting>[NetDev]
|
|
Name=bridge0
|
|
Kind=bridge</programlisting>
|
|
</example>
|
|
</refsect1>
|
|
|
|
<refsect1>
|
|
<title>Example</title>
|
|
<example>
|
|
<title>/etc/systemd/network/vlan1.netdev</title>
|
|
|
|
<programlisting>[NetDev]
|
|
Name=vlan1
|
|
Kind=vlan
|
|
|
|
[VLAN]
|
|
Id=1</programlisting>
|
|
</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>
|
|
|
|
</refentry>
|