818bf54632
This part of the copyright blurb stems from the GPL use recommendations: https://www.gnu.org/licenses/gpl-howto.en.html The concept appears to originate in times where version control was per file, instead of per tree, and was a way to glue the files together. Ultimately, we nowadays don't live in that world anymore, and this information is entirely useless anyway, as people are very welcome to copy these files into any projects they like, and they shouldn't have to change bits that are part of our copyright header for that. hence, let's just get rid of this old cruft, and shorten our codebase a bit.
121 lines
4.7 KiB
XML
121 lines
4.7 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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Copyright 2014 Lennart Poettering
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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 synchronization. See
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<citerefentry><refentrytitle>systemd.syntax</refentrytitle><manvolnum>5</manvolnum></citerefentry>
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for a general description of the syntax.</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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