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<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
- "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
+ "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.
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- 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.
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- You should have received a copy of the GNU Lesser General Public License
- along with systemd; If not, see <http://www.gnu.org/licenses/>.
+ 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>
-
- <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="confd" />
- <xi:include href="standard-conf.xml" xpointer="conf" />
-
- <refsect1>
- <title>Options</title>
-
- <variablelist class='network-directives'>
-
- <varlistentry>
- <term><varname>NTP=</varname></term>
- <listitem><para>A space separated list
- of NTP servers 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 the 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>
+ 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>