136 lines
5.2 KiB
XML
136 lines
5.2 KiB
XML
<?xml version='1.0'?> <!--*-nxml-*-->
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<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
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"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
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<!--
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SPDX-License-Identifier: LGPL-2.1+
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This file is part of systemd.
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Copyright 2014 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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-->
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<refentry id="timesyncd.conf" conditional='ENABLE_TIMESYNCD'
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xmlns:xi="http://www.w3.org/2001/XInclude">
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<refentryinfo>
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<title>timesyncd.conf</title>
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<productname>systemd</productname>
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<authorgroup>
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<author>
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<contrib>Developer</contrib>
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<firstname>Lennart</firstname>
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<surname>Poettering</surname>
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<email>lennart@poettering.net</email>
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</author>
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</authorgroup>
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</refentryinfo>
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<refmeta>
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<refentrytitle>timesyncd.conf</refentrytitle>
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<manvolnum>5</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>timesyncd.conf</refname>
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<refname>timesyncd.conf.d</refname>
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<refpurpose>Network Time Synchronization configuration files</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<para><filename>/etc/systemd/timesyncd.conf</filename></para>
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<para><filename>/etc/systemd/timesyncd.conf.d/*.conf</filename></para>
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<para><filename>/run/systemd/timesyncd.conf.d/*.conf</filename></para>
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<para><filename>/usr/lib/systemd/timesyncd.conf.d/*.conf</filename></para>
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</refsynopsisdiv>
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<refsect1>
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<title>Description</title>
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<para>These configuration files control NTP network time
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synchronization.</para>
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</refsect1>
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<xi:include href="standard-conf.xml" xpointer="main-conf" />
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<refsect1>
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<title>Options</title>
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<para>The following settings are configured in the <literal>[Time]</literal> section:</para>
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<variablelist class='network-directives'>
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<varlistentry>
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<term><varname>NTP=</varname></term>
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<listitem><para>A space-separated list of NTP server host
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names or IP addresses. During runtime this list is combined
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with any per-interface NTP servers acquired from
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<citerefentry><refentrytitle>systemd-networkd.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>.
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systemd-timesyncd will contact all configured system or
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per-interface servers in turn until one is found that
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responds. When the empty string is assigned, the list of
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NTP servers is reset, and all assignments prior to this one
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will have no effect. This setting defaults to an empty
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list.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>FallbackNTP=</varname></term>
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<listitem><para>A space-separated list of NTP server host
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names or IP addresses to be used as the fallback NTP servers.
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Any per-interface NTP servers obtained from
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<citerefentry><refentrytitle>systemd-networkd.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>
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take precedence over this setting, as do any servers set via
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<varname>NTP=</varname> above. This setting is hence only used
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if no other NTP server information is known. When the empty
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string is assigned, the list of NTP servers is reset,
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and all assignments prior to this one will have no effect.
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If this option is not given, a compiled-in list of NTP servers
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is used instead.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>RootDistanceMaxSec=</varname></term>
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<listitem><para>Maximum acceptable root distance. Takes a time value (in seconds).
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Defaults to 5 seconds.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>PollIntervalMinSec=</varname></term>
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<term><varname>PollIntervalMaxSec=</varname></term>
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<listitem><para>The minimum and maximum poll intervals for NTP messages.
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Each setting takes a time value (in seconds).
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<varname>PollIntervalMinSec=</varname> must not be smaller than 16 seconds.
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<varname>PollIntervalMaxSec=</varname> must be larger than <varname>PollIntervalMinSec=</varname>.
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<varname>PollIntervalMinSec=</varname> defaults to 32 seconds, and
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<varname>PollIntervalMaxSec=</varname> defaults to 2048 seconds.</para></listitem>
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</varlistentry>
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</variablelist>
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</refsect1>
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<refsect1>
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<title>See Also</title>
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<para>
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<citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>systemd-timesyncd.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>systemd-networkd.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>
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</para>
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</refsect1>
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</refentry>
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