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<?xml version='1.0'?> <!--*-nxml-*-->
<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
<!-- SPDX-License-Identifier: LGPL-2.1-or-later -->
<refentry id="systemd-networkd.service" conditional='ENABLE_NETWORKD'>
<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>
</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
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>
<para><command>systemd-networkd</command> may be introspected and controlled at runtime using
<citerefentry><refentrytitle>networkctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>.
</para>
</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>,
the volatile runtime network directory
<filename>/run/systemd/network</filename> and the local administration
network directory <filename>/etc/systemd/network</filename>.</para>
<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>networkctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
<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>,
<citerefentry><refentrytitle>systemd-network-generator.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>
</para>
</refsect1>
</refentry>
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