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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">
<!--
This file is part of systemd.
Copyright 2014 Lennart Poettering
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="timesyncd.conf" conditional='ENABLE_TIMESYNCD'
xmlns:xi="http://www.w3.org/2001/XInclude">
<refentryinfo>
<title>timesyncd.conf</title>
<productname>systemd</productname>
<authorgroup>
<author>
<contrib>Developer</contrib>
<firstname>Lennart</firstname>
<surname>Poettering</surname>
<email>lennart@poettering.net</email>
</author>
</authorgroup>
</refentryinfo>
<refmeta>
<refentrytitle>timesyncd.conf</refentrytitle>
<manvolnum>5</manvolnum>
</refmeta>
<refnamediv>
<refname>timesyncd.conf</refname>
<refname>timesyncd.conf.d</refname>
<refpurpose>Network Time Synchronization configuration files</refpurpose>
</refnamediv>
<refsynopsisdiv>
<para><filename>/etc/systemd/timesyncd.conf</filename></para>
<para><filename>/etc/systemd/timesyncd.conf.d/*.conf</filename></para>
<para><filename>/run/systemd/timesyncd.conf.d/*.conf</filename></para>
<para><filename>/usr/lib/systemd/timesyncd.conf.d/*.conf</filename></para>
</refsynopsisdiv>
<refsect1>
<title>Description</title>
<para>These configuration files control NTP network time
synchronization.</para>
</refsect1>
<xi:include href="standard-conf.xml" xpointer="main-conf" />
<refsect1>
<title>Options</title>
<para>The following settings are configured in the <literal>[Time]</literal> section:</para>
<variablelist class='network-directives'>
<varlistentry>
<term><varname>NTP=</varname></term>
<listitem><para>A space-separated list of NTP server host
names or IP addresses. During runtime this list is combined
with any per-interface NTP servers acquired from
<citerefentry><refentrytitle>systemd-networkd.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>.
systemd-timesyncd will contact all configured system or
per-interface servers in turn until one is found that
responds. This setting defaults to an empty
list.</para></listitem>
</varlistentry>
<varlistentry>
<term><varname>FallbackNTP=</varname></term>
<listitem><para>A space-separated list of NTP server host
names or IP addresses to be used as the fallback NTP servers.
Any per-interface NTP servers obtained from
<citerefentry><refentrytitle>systemd-networkd.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>
take precedence over this setting, as do any servers set via
<varname>NTP=</varname> above. This setting is hence only used
if no other NTP server information is known. If this option is
not given, a compiled-in list of NTP servers is used
instead.</para></listitem>
</varlistentry>
</variablelist>
</refsect1>
<refsect1>
<title>See Also</title>
<para>
<citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
<citerefentry><refentrytitle>systemd-timesyncd.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
<citerefentry><refentrytitle>systemd-networkd.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>
</para>
</refsect1>
</refentry>
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