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106 lines
4.7 KiB
XML
106 lines
4.7 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/4.2/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-timesyncd</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-timesyncd</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>
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<citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>timedatectl</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>localtime</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
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<citerefentry project='man-pages'><refentrytitle>hwclock</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>systemd-timesyncd</refentrytitle><manvolnum>8</manvolnum></citerefentry>
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</para>
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</refsect1>
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</refentry>
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