man/timesyncd.conf.xml

   1 <?xml version='1.0'?> <!--*-nxml-*-->
   2 <!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
   3   "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
   4
   5 <!--
   6   This file is part of systemd.
   7
   8   Copyright 2014 Lennart Poettering
   9
  10   systemd is free software; you can redistribute it and/or modify it
  11   under the terms of the GNU Lesser General Public License as published by
  12   the Free Software Foundation; either version 2.1 of the License, or
  13   (at your option) any later version.
  14
  15   systemd is distributed in the hope that it will be useful, but
  16   WITHOUT ANY WARRANTY; without even the implied warranty of
  17   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  18   Lesser General Public License for more details.
  19
  20   You should have received a copy of the GNU Lesser General Public License
  21   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  22 -->
  23
  24 <refentry id="timesyncd.conf" conditional='ENABLE_TIMESYNCD'
  25     xmlns:xi="http://www.w3.org/2001/XInclude">
  26   <refentryinfo>
  27     <title>timesyncd.conf</title>
  28     <productname>systemd</productname>
  29
  30     <authorgroup>
  31       <author>
  32         <contrib>Developer</contrib>
  33         <firstname>Lennart</firstname>
  34         <surname>Poettering</surname>
  35         <email>lennart@poettering.net</email>
  36       </author>
  37     </authorgroup>
  38   </refentryinfo>
  39
  40   <refmeta>
  41     <refentrytitle>timesyncd.conf</refentrytitle>
  42     <manvolnum>5</manvolnum>
  43   </refmeta>
  44
  45   <refnamediv>
  46     <refname>timesyncd.conf</refname>
  47     <refname>timesyncd.conf.d</refname>
  48     <refpurpose>Network Time Synchronization configuration files</refpurpose>
  49   </refnamediv>
  50
  51   <refsynopsisdiv>
  52     <para><filename>/etc/systemd/timesyncd.conf</filename></para>
  53     <para><filename>/etc/systemd/timesyncd.conf.d/*.conf</filename></para>
  54     <para><filename>/run/systemd/timesyncd.conf.d/*.conf</filename></para>
  55     <para><filename>/usr/lib/systemd/timesyncd.conf.d/*.conf</filename></para>
  56   </refsynopsisdiv>
  57
  58   <refsect1>
  59     <title>Description</title>
  60
  61     <para>These configuration files control NTP network time
  62     synchronization.</para>
  63
  64   </refsect1>
  65
  66   <xi:include href="standard-conf.xml" xpointer="main-conf" />
  67
  68   <refsect1>
  69     <title>Options</title>
  70
  71     <para>The following settings are configured in the <literal>[Time]</literal> section:</para>
  72
  73     <variablelist class='network-directives'>
  74
  75       <varlistentry>
  76         <term><varname>NTP=</varname></term>
  77         <listitem><para>A space-separated list of NTP server 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 an 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>
 111
 112 </refentry>