man/systemd-networkd.service.xml

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   2 <!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
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   4 <!-- SPDX-License-Identifier: LGPL-2.1-or-later -->
   5
   6 <refentry id="systemd-networkd.service" conditional='ENABLE_NETWORKD'>
   7
   8   <refentryinfo>
   9     <title>systemd-networkd.service</title>
  10     <productname>systemd</productname>
  11   </refentryinfo>
  12
  13   <refmeta>
  14     <refentrytitle>systemd-networkd.service</refentrytitle>
  15     <manvolnum>8</manvolnum>
  16   </refmeta>
  17
  18   <refnamediv>
  19     <refname>systemd-networkd.service</refname>
  20     <refname>systemd-networkd</refname>
  21     <refpurpose>Network manager</refpurpose>
  22   </refnamediv>
  23
  24   <refsynopsisdiv>
  25     <para><filename>systemd-networkd.service</filename></para>
  26     <para><filename>/usr/lib/systemd/systemd-networkd</filename></para>
  27   </refsynopsisdiv>
  28
  29   <refsect1>
  30     <title>Description</title>
  31
  32     <para><command>systemd-networkd</command> is a system service that
  33     manages networks. It detects and configures network devices as
  34     they appear, as well as creating virtual network devices.</para>
  35
  36     <para>To configure low-level link settings independently of
  37     networks, see
  38     <citerefentry><refentrytitle>systemd.link</refentrytitle><manvolnum>5</manvolnum></citerefentry>.</para>
  39
  40     <para><command>systemd-networkd</command> will create network devices based
  41     on the configuration in
  42     <citerefentry><refentrytitle>systemd.netdev</refentrytitle><manvolnum>5</manvolnum></citerefentry>
  43     files, respecting the [Match] sections in those files.</para>
  44
  45     <para><command>systemd-networkd</command> will manage network addresses and
  46     routes for any link for which it finds a <filename>.network</filename> file
  47     with an appropriate [Match] section, see
  48     <citerefentry><refentrytitle>systemd.network</refentrytitle><manvolnum>5</manvolnum></citerefentry>.
  49     For those links, it will flush existing network addresses and routes when
  50     bringing up the device. Any links not matched by one of the
  51     <filename>.network</filename> files will be ignored. It is also possible to
  52     explicitly tell <filename>systemd-networkd</filename> to ignore a link by
  53     using <varname>Unmanaged=yes</varname> option, see
  54     <citerefentry><refentrytitle>systemd.network</refentrytitle><manvolnum>5</manvolnum></citerefentry>.
  55     </para>
  56
  57     <para>When <filename>systemd-networkd</filename> exits, it generally leaves existing network devices and
  58     configuration intact. This makes it possible to transition from the initrd and to restart the service
  59     without breaking connectivity. This also means that when configuration is updated and
  60     <filename>systemd-networkd</filename> is restarted, netdev interfaces for which configuration was removed
  61     will not be dropped, and may need to be cleaned up manually.</para>
  62
  63     <para><command>systemd-networkd</command> may be introspected and controlled at runtime using
  64     <citerefentry><refentrytitle>networkctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>.
  65     </para>
  66   </refsect1>
  67
  68   <refsect1><title>Configuration Files</title>
  69     <para>The configuration files are read from the files located in the
  70     system network directory <filename>/usr/lib/systemd/network</filename>,
  71     the volatile runtime network directory
  72     <filename>/run/systemd/network</filename> and the local administration
  73     network directory <filename>/etc/systemd/network</filename>.</para>
  74
  75     <para>Networks are configured in <filename>.network</filename>
  76     files, see
  77     <citerefentry><refentrytitle>systemd.network</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
  78     and virtual network devices are configured in
  79     <filename>.netdev</filename> files, see
  80     <citerefentry><refentrytitle>systemd.netdev</refentrytitle><manvolnum>5</manvolnum></citerefentry>.
  81     </para>
  82   </refsect1>
  83
  84   <refsect1>
  85     <title>See Also</title>
  86     <para>
  87       <citerefentry><refentrytitle>networkctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
  88       <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
  89       <citerefentry><refentrytitle>systemd.link</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
  90       <citerefentry><refentrytitle>systemd.network</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
  91       <citerefentry><refentrytitle>systemd.netdev</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
  92       <citerefentry><refentrytitle>systemd-networkd-wait-online.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
  93       <citerefentry><refentrytitle>systemd-network-generator.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>
  94     </para>
  95   </refsect1>
  96
  97 </refentry>