man/timesyncd.conf.xml

<?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">

<!--
  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. 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. 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>

</refentry>