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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+
+-->
+
+<refentry id="timesyncd.conf" conditional='ENABLE_TIMESYNCD'
+ xmlns:xi="http://www.w3.org/2001/XInclude">
+ <refentryinfo>
+ <title>timesyncd.conf</title>
+ <productname>systemd</productname>
+ </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. See
+ <citerefentry><refentrytitle>systemd.syntax</refentrytitle><manvolnum>5</manvolnum></citerefentry>
+ for a general description of the syntax.</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>