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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">
<!--
SPDX-License-Identifier: LGPL-2.1+
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. When the empty string is assigned, the list of
NTP servers is reset, and all assignments prior to this one
will have no effect. 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. When the empty
string is assigned, the list of NTP servers is reset,
and all assignments prior to this one will have no effect.
If this option is not given, a compiled-in list of NTP servers
is used instead.</para></listitem>
</varlistentry>
<varlistentry>
<term><varname>RootDistanceMaxSec=</varname></term>
<listitem><para>Maximum acceptable root distance. Takes a time value (in seconds).
Defaults to 5 seconds.</para></listitem>
</varlistentry>
<varlistentry>
<term><varname>PollIntervalMinSec=</varname></term>
<term><varname>PollIntervalMaxSec=</varname></term>
<listitem><para>The minimum and maximum poll intervals for NTP messages.
Each setting takes a time value (in seconds).
<varname>PollIntervalMinSec=</varname> must not be smaller than 16 seconds.
<varname>PollIntervalMaxSec=</varname> must be larger than <varname>PollIntervalMinSec=</varname>.
<varname>PollIntervalMinSec=</varname> defaults to 32 seconds, and
<varname>PollIntervalMaxSec=</varname> defaults to 2048 seconds.</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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