"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
<!--
- This file is part of systemd.
+ SPDX-License-Identifier: LGPL-2.1+
- Copyright 2014 Kay Sievers
-
- 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/>.
+ Copyright © 2014 Kay Sievers
-->
<refentry id="systemd-timesyncd.service" conditional='ENABLE_TIMESYNCD'>
reboots to ensure it monotonically advances even if the system
lacks a battery-buffered RTC chip.</para>
+ <para>The <filename>systemd-timesyncd</filename> service
+ specifically implements only SNTP. This minimalistic
+ service will set the system clock for large offsets or
+ slowly adjust it for smaller deltas. More complex use
+ cases are not covered by <filename>systemd-timesyncd</filename>.</para>
+
<para>The NTP servers contacted are determined from the global
settings in
<citerefentry><refentrytitle>timesyncd.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
<para><citerefentry><refentrytitle>timedatectl</refentrytitle><manvolnum>1</manvolnum></citerefentry>'s
<command>set-ntp</command> command may be used to enable and
start, or disable and stop this service.</para>
+
+ <para><citerefentry><refentrytitle>timedatectl</refentrytitle><manvolnum>1</manvolnum></citerefentry>'s
+ <command>timesync-status</command> or <command>show-timesync</command> command can be used to show the
+ current status of this service.</para>
</refsect1>
<refsect1>
<variablelist>
<varlistentry>
- <term><filename>/var/lib/systemd/clock</filename></term>
+ <term><filename>/var/lib/systemd/timesync/clock</filename></term>
<listitem>
- <para>This file contains the timestamp of the last successful
- synchronization.</para>
+ <para>The modification time of this file indicates the timestamp of the last successful
+ synchronization (or at least the systemd build date, in case synchronization was not
+ possible).</para>
</listitem>
</varlistentry>
+
+ <varlistentry>
+ <term><filename>/run/systemd/timesync/synchronized</filename></term>
+
+ <listitem>
+ <para>A file that is touched on each successful synchronization, to assist
+ <filename>systemd-time-wait-sync</filename> and other applications to detecting synchronization
+ events.</para>
+ </listitem>
+
+ </varlistentry>
</variablelist>
</refsect1>
<citerefentry><refentrytitle>timesyncd.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
<citerefentry><refentrytitle>systemd.network</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
<citerefentry><refentrytitle>systemd-networkd.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
+ <citerefentry><refentrytitle>systemd-time-wait-sync.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
<citerefentry><refentrytitle>timedatectl</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
<citerefentry><refentrytitle>localtime</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
<citerefentry project='man-pages'><refentrytitle>hwclock</refentrytitle><manvolnum>8</manvolnum></citerefentry>