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systemd/man/systemd-networkd.service.xml

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<?xml version='1.0'?> <!--*-nxml-*-->
<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
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<!--
SPDX-License-Identifier: LGPL-2.1+
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-->
<refentry id="systemd-networkd.service" conditional='ENABLE_NETWORKD'>
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<refentryinfo>
<title>systemd-networkd.service</title>
<productname>systemd</productname>
</refentryinfo>
<refmeta>
<refentrytitle>systemd-networkd.service</refentrytitle>
<manvolnum>8</manvolnum>
</refmeta>
<refnamediv>
<refname>systemd-networkd.service</refname>
<refname>systemd-networkd</refname>
<refpurpose>Network manager</refpurpose>
</refnamediv>
<refsynopsisdiv>
<para><filename>systemd-networkd.service</filename></para>
<para><filename>/usr/lib/systemd/systemd-networkd</filename></para>
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</refsynopsisdiv>
<refsect1>
<title>Description</title>
<para><command>systemd-networkd</command> is a system service that
manages networks. It detects and configures network devices as
they appear, as well as creating virtual network devices.</para>
<para>To configure low-level link settings independently of
networks, see
<citerefentry><refentrytitle>systemd.link</refentrytitle><manvolnum>5</manvolnum></citerefentry>.</para>
<para><command>systemd-networkd</command> will create network devices based
on the configuration in
<citerefentry><refentrytitle>systemd.netdev</refentrytitle><manvolnum>5</manvolnum></citerefentry>
files, respecting the [Match] sections in those files.</para>
<para><command>systemd-networkd</command> will manage network addresses and
routes for any link for which it finds a <filename>.network</filename> file
with an appropriate [Match] section, see
<citerefentry><refentrytitle>systemd.network</refentrytitle><manvolnum>5</manvolnum></citerefentry>.
For those links, it will flush existing network addresses and routes when
bringing up the device. Any links not matched by one of the
<filename>.network</filename> files will be ignored. It is also possible to
explicitly tell <filename>systemd-networkd</filename> to ignore a link by
using <varname>Unmanaged=yes</varname> option, see
<citerefentry><refentrytitle>systemd.network</refentrytitle><manvolnum>5</manvolnum></citerefentry>.
</para>
<para>When <filename>systemd-networkd</filename> exits, it generally leaves
existing network devices and configuration intact. This makes it possible to
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transition from the initramfs and to restart the service without breaking
connectivity. This also means that when configuration is updated and
<filename>systemd-networkd</filename> is restarted, netdev interfaces for
which configuration was removed will not be dropped, and may need to be
cleaned up manually.</para>
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</refsect1>
<refsect1><title>Configuration Files</title>
<para>The configuration files are read from the files located in the
system network directory <filename>/usr/lib/systemd/network</filename>,
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the volatile runtime network directory
<filename>/run/systemd/network</filename> and the local administration
network directory <filename>/etc/systemd/network</filename>.</para>
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<para>Networks are configured in <filename>.network</filename>
files, see
<citerefentry><refentrytitle>systemd.network</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
and virtual network devices are configured in
<filename>.netdev</filename> files, see
<citerefentry><refentrytitle>systemd.netdev</refentrytitle><manvolnum>5</manvolnum></citerefentry>.
</para>
</refsect1>
<refsect1>
<title>See Also</title>
<para>
<citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
<citerefentry><refentrytitle>systemd.link</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
<citerefentry><refentrytitle>systemd.network</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
<citerefentry><refentrytitle>systemd.netdev</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
<citerefentry><refentrytitle>systemd-networkd-wait-online.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>
</para>
</refsect1>
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</refentry>