man/timesyncd.conf.xml

<?xml version='1.0'?> <!--*-nxml-*-->
<?xml-stylesheet type="text/xsl" href="http://docbook.sourceforge.net/release/xsl/current/xhtml/docbook.xsl"?>
<!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="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>

</refentry>