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607d297487
Let's systematically make sure that we link up the D-Bus interfaces from
the daemon man pages once in prose and once in short form at the bottom
("See Also"), for all daemons.
Also, add reverse links at the bottom of the D-Bus API docs.
Fixes: #34996
107 lines
4.9 KiB
XML
107 lines
4.9 KiB
XML
<?xml version='1.0'?> <!--*-nxml-*-->
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<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
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"http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd">
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<!-- SPDX-License-Identifier: LGPL-2.1-or-later -->
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<refentry id="systemd-timedated.service" conditional='ENABLE_TIMEDATED'>
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<refentryinfo>
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<title>systemd-timedated.service</title>
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<productname>systemd</productname>
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</refentryinfo>
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<refmeta>
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<refentrytitle>systemd-timedated.service</refentrytitle>
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<manvolnum>8</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>systemd-timedated.service</refname>
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<refname>systemd-timedated</refname>
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<refpurpose>Time and date bus mechanism</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<para><filename>systemd-timedated.service</filename></para>
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<para><filename>/usr/lib/systemd/systemd-timedated</filename></para>
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</refsynopsisdiv>
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<refsect1>
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<title>Description</title>
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<para><filename>systemd-timedated.service</filename> is a system service
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that may be used as a mechanism to change the system clock and
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timezone, as well as to enable/disable network time synchronization.
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<filename>systemd-timedated</filename> is automatically activated
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on request and terminates itself when it is unused.</para>
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<para>The tool
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<citerefentry><refentrytitle>timedatectl</refentrytitle><manvolnum>1</manvolnum></citerefentry>
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is a command line client to this service.</para>
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<para><filename>systemd-timedated</filename> currently offers access to
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the following four settings:
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<itemizedlist>
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<listitem><para>The system time</para></listitem>
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<listitem><para>The system timezone</para></listitem>
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<listitem><para>A boolean controlling whether the system RTC is in local or UTC
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timezone</para></listitem>
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<listitem><para>Whether the time synchronization service is enabled/started or
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disabled/stopped, see next section.</para></listitem>
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</itemizedlist></para>
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<para>See
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<citerefentry><refentrytitle>org.freedesktop.timedate1</refentrytitle><manvolnum>5</manvolnum></citerefentry>
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and
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<citerefentry><refentrytitle>org.freedesktop.LogControl1</refentrytitle><manvolnum>5</manvolnum></citerefentry>
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for information about the D-Bus API.</para>
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</refsect1>
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<refsect1>
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<title>List of network time synchronization services</title>
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<para><command>systemd-timedated</command> will look for files with a <literal>.list</literal> extension
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in <filename>ntp-units.d/</filename> directories. Each file is parsed as a list of unit names, one per
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line. Empty lines and lines with comments (<literal>#</literal>) are ignored. Files are read from
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<filename>/usr/lib/systemd/ntp-units.d/</filename> and the corresponding directories under
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<filename>/etc/</filename>, <filename>/run/</filename>, <filename>/usr/local/lib/</filename>. Files in
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<filename>/etc/</filename> override files with the same name in <filename>/run/</filename>,
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<filename>/usr/local/lib/</filename>, and <filename>/usr/lib/</filename>. Files in
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<filename>/run/</filename> override files with the same name under <filename>/usr/</filename>. Packages
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should install their configuration files in <filename>/usr/lib/</filename> (distribution packages) or
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<filename>/usr/local/lib/</filename> (local installs).</para>
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<example>
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<title><filename>ntp-units.d/</filename> entry for <command>systemd-timesyncd</command></title>
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<programlisting># /usr/lib/systemd/ntp-units.d/80-systemd-timesync.list
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systemd-timesyncd.service
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</programlisting>
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</example>
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<para>If the environment variable <varname>$SYSTEMD_TIMEDATED_NTP_SERVICES</varname> is set,
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<command>systemd-timedated</command> will parse the contents of that variable as a colon-separated list
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of unit names. When set, this variable overrides the file-based list described above.</para>
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<example>
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<title>An override that specifies that <command>chronyd</command> should be used if available</title>
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<programlisting>SYSTEMD_TIMEDATED_NTP_SERVICES=chronyd.service:systemd-timesyncd.service</programlisting>
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</example>
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</refsect1>
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<refsect1>
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<title>See Also</title>
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<para><simplelist type="inline">
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<member><citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry></member>
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<member><citerefentry><refentrytitle>timedatectl</refentrytitle><manvolnum>1</manvolnum></citerefentry></member>
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<member><citerefentry><refentrytitle>localtime</refentrytitle><manvolnum>5</manvolnum></citerefentry></member>
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<member><citerefentry project='man-pages'><refentrytitle>hwclock</refentrytitle><manvolnum>8</manvolnum></citerefentry></member>
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<member><citerefentry><refentrytitle>systemd-timesyncd</refentrytitle><manvolnum>8</manvolnum></citerefentry></member>
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<member><citerefentry><refentrytitle>org.freedesktop.timedate1</refentrytitle><manvolnum>5</manvolnum></citerefentry></member>
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</simplelist></para>
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</refsect1>
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</refentry>
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