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1<?xml version='1.0'?> <!--*-nxml-*-->
2<?xml-stylesheet type="text/xsl" href="http://docbook.sourceforge.net/release/xsl/current/xhtml/docbook.xsl"?>
3<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
798d3a52 4 "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
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5
6<!--
7 This file is part of systemd.
8
9 Copyright 2014 Lennart Poettering
10
11 systemd is free software; you can redistribute it and/or modify it
12 under the terms of the GNU Lesser General Public License as published by
13 the Free Software Foundation; either version 2.1 of the License, or
14 (at your option) any later version.
15
16 systemd is distributed in the hope that it will be useful, but
17 WITHOUT ANY WARRANTY; without even the implied warranty of
18 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
19 Lesser General Public License for more details.
20
21 You should have received a copy of the GNU Lesser General Public License
22 along with systemd; If not, see <http://www.gnu.org/licenses/>.
23-->
24
be795898 25<refentry id="timesyncd.conf" conditional='ENABLE_TIMESYNCD'
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26 xmlns:xi="http://www.w3.org/2001/XInclude">
27 <refentryinfo>
28 <title>timesyncd.conf</title>
29 <productname>systemd</productname>
30
31 <authorgroup>
32 <author>
33 <contrib>Developer</contrib>
34 <firstname>Lennart</firstname>
35 <surname>Poettering</surname>
36 <email>lennart@poettering.net</email>
37 </author>
38 </authorgroup>
39 </refentryinfo>
40
41 <refmeta>
42 <refentrytitle>timesyncd.conf</refentrytitle>
43 <manvolnum>5</manvolnum>
44 </refmeta>
45
46 <refnamediv>
47 <refname>timesyncd.conf</refname>
48 <refname>timesyncd.conf.d</refname>
49 <refpurpose>Network Time Synchronization configuration files</refpurpose>
50 </refnamediv>
51
52 <refsynopsisdiv>
53 <para><filename>/etc/systemd/timesyncd.conf</filename></para>
54 <para><filename>/etc/systemd/timesyncd.conf.d/*.conf</filename></para>
55 <para><filename>/run/systemd/timesyncd.conf.d/*.conf</filename></para>
56 <para><filename>/usr/lib/systemd/timesyncd.conf.d/*.conf</filename></para>
57 </refsynopsisdiv>
58
59 <refsect1>
60 <title>Description</title>
61
62 <para>These configuration files control NTP network time
63 synchronization.</para>
64
65 </refsect1>
66
67 <xi:include href="standard-conf.xml" xpointer="confd" />
68 <xi:include href="standard-conf.xml" xpointer="conf" />
69
70 <refsect1>
71 <title>Options</title>
72
73 <variablelist class='network-directives'>
74
75 <varlistentry>
76 <term><varname>NTP=</varname></term>
77 <listitem><para>A space separated list of NTP servers host
78 names or IP addresses. During runtime this list is combined
79 with any per-interface NTP servers acquired from
80 <citerefentry><refentrytitle>systemd-networkd.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>.
81 systemd-timesyncd will contact all configured system or
82 per-interface servers in turn until one is found that
83 responds. This setting defaults to the empty
84 list.</para></listitem>
85 </varlistentry>
86
87 <varlistentry>
88 <term><varname>FallbackNTP=</varname></term>
89 <listitem><para>A space separated list of NTP server host
90 names or IP addresses to be used as the fallback NTP servers.
91 Any per-interface NTP servers obtained from
92 <citerefentry><refentrytitle>systemd-networkd.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>
93 take precedence over this setting, as do any servers set via
94 <varname>NTP=</varname> above. This setting is hence only used
95 if no other NTP server information is known. If this option is
96 not given, a compiled-in list of NTP servers is used
97 instead.</para></listitem>
98 </varlistentry>
99
100 </variablelist>
101 </refsect1>
102
103 <refsect1>
104 <title>See Also</title>
105 <para>
106 <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
107 <citerefentry><refentrytitle>systemd-timesyncd.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
108 <citerefentry><refentrytitle>systemd-networkd.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>
109 </para>
110 </refsect1>
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111
112</refentry>