<?xml version='1.0'?> <!--*-nxml-*-->
-<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
+<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
+<!-- SPDX-License-Identifier: LGPL-2.1+ -->
-<!--
- SPDX-License-Identifier: LGPL-2.1+
-
- This file is part of systemd.
-
- Copyright 2012 Lennart Poettering
-
- 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/>.
--->
-
-<refentry id="timedatectl" conditional='ENABLE_TIMEDATED'
+<refentry id="timedatectl" conditional='ENABLE_TIMEDATECTL'
xmlns:xi="http://www.w3.org/2001/XInclude">
<refentryinfo>
<title>timedatectl</title>
<productname>systemd</productname>
-
- <authorgroup>
- <author>
- <contrib>Developer</contrib>
- <firstname>Lennart</firstname>
- <surname>Poettering</surname>
- <email>lennart@poettering.net</email>
- </author>
- </authorgroup>
</refentryinfo>
<refmeta>
<refsynopsisdiv>
<cmdsynopsis>
- <command>timedatectl <arg choice="opt" rep="repeat">OPTIONS</arg> <arg choice="req">COMMAND</arg></command>
+ <command>timedatectl</command>
+ <arg choice="opt" rep="repeat">OPTIONS</arg>
+ <arg choice="req">COMMAND</arg>
</cmdsynopsis>
</refsynopsisdiv>
<refsect1>
<title>Description</title>
- <para><command>timedatectl</command> may be used to query and
- change the system clock and its settings.</para>
+ <para><command>timedatectl</command> may be used to query and change the system clock and its settings,
+ and enable or disable time synchronization services.</para>
<para>Use
<citerefentry><refentrytitle>systemd-firstboot</refentrytitle><manvolnum>1</manvolnum></citerefentry>
to initialize the system time zone for mounted (but not booted)
system images.</para>
+
+ <para><command>timedatectl</command> may be used to show the current status of time synchronization
+ services, for example
+ <citerefentry><refentrytitle>systemd-timesyncd.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>.
+ </para>
+
</refsect1>
<refsect1>
- <title>Options</title>
+ <title>Commands</title>
- <para>The following options are understood:</para>
+ <para>The following commands are understood:</para>
<variablelist>
<varlistentry>
- <term><option>--no-ask-password</option></term>
-
- <listitem><para>Do not query the user for authentication for
- privileged operations.</para></listitem>
- </varlistentry>
-
- <varlistentry>
- <term><option>--adjust-system-clock</option></term>
+ <term><command>status</command></term>
- <listitem><para>If <command>set-local-rtc</command> is invoked
- and this option is passed, the system clock is synchronized
- from the RTC again, taking the new setting into account.
- Otherwise, the RTC is synchronized from the system
- clock.</para></listitem>
+ <listitem><para>Show current settings of the system clock and RTC, including whether network time
+ synchronization is active. If no command is specified, this is the implied default.
+ </para></listitem>
</varlistentry>
- <xi:include href="user-system-options.xml" xpointer="host" />
- <xi:include href="user-system-options.xml" xpointer="machine" />
-
- <xi:include href="standard-options.xml" xpointer="help" />
- <xi:include href="standard-options.xml" xpointer="version" />
- <xi:include href="standard-options.xml" xpointer="no-pager" />
- </variablelist>
-
- <para>The following commands are understood:</para>
-
- <variablelist>
<varlistentry>
- <term><command>status</command></term>
+ <term><command>show</command></term>
- <listitem><para>Show current settings of the system clock and RTC,
- including whether network time synchronization through
- <filename>systemd-timesyncd.service</filename> is active. Even if it is
- inactive, a different service might still synchronize the clock.
- </para></listitem>
+ <listitem><para>Show the same information as <option>status</option>, but in machine readable form.
+ This command is intended to be used whenever computer-parsable output is required.
+ Use <option>status</option> if you are looking for formatted human-readable output.</para>
+ <para>By default, empty properties are suppressed. Use <option>--all</option> to show those too.
+ To select specific properties to show, use <option>--property=</option>.</para></listitem>
</varlistentry>
<varlistentry>
<varlistentry>
<term><command>set-ntp [BOOL]</command></term>
- <listitem><para>Takes a boolean argument. Controls whether
- network time synchronization is active and enabled (if
- available). This enables and starts, or disables and stops the
- <filename>systemd-timesyncd.service</filename> unit. It does
- not affect the state of any other, unrelated network time
- synchronization services that might be installed on the
- system. This command is hence mostly equivalent to:
- <command>systemctl enable --now
- systemd-timesyncd.service</command> and <command>systemctl
- disable --now systemd-timesyncd.service</command>, but is
- protected by a different access policy.</para>
-
- <para>Note that even if time synchronization is turned off
- with this command, another unrelated system service might
- still synchronize the clock with the network. Also note that,
- strictly speaking,
- <filename>systemd-timesyncd.service</filename> does more than
- just network time synchronization, as it ensures a monotonic
- clock on systems without RTC even if no network is
- available. See
- <citerefentry><refentrytitle>systemd-timesyncd.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>
- for details about this.</para></listitem>
+ <listitem><para>Takes a boolean argument. Controls whether network time synchronization is active and
+ enabled (if available). If the argument is true, this enables and starts the first existing network
+ synchronization service. If the argument is false, then this disables and stops the known network
+ synchronization services. The way that the list of services is built is described below.</para>
+ </listitem>
</varlistentry>
</variablelist>
+ <refsect2>
+ <title>systemd-timesyncd Commands</title>
+
+ <para>The following commands are specific to
+ <citerefentry><refentrytitle>systemd-timesyncd.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>.
+ </para>
+
+ <variablelist>
+ <varlistentry>
+ <term><command>timesync-status</command></term>
+
+ <listitem><para>Show current status of
+ <citerefentry><refentrytitle>systemd-timesyncd.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>.
+ If <option>--monitor</option> is specified, then this will monitor the status updates.</para></listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><command>show-timesync</command></term>
+
+ <listitem><para>Show the same information as <option>timesync-status</option>, but in machine readable form.
+ This command is intended to be used whenever computer-parsable output is required.
+ Use <option>timesync-status</option> if you are looking for formatted human-readable output.</para>
+ <para>By default, empty properties are suppressed. Use <option>--all</option> to show those too.
+ To select specific properties to show, use <option>--property=</option>.</para></listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><command>ntp-servers <replaceable>INTERFACE</replaceable> <replaceable>SERVER</replaceable>…</command></term>
+
+ <listitem><para>Set the interface specific NTP servers. This command can be used only when the
+ interface is managed by <command>systemd-networkd</command>.</para></listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><command>revert <replaceable>INTERFACE</replaceable></command></term>
+
+ <listitem><para>Revert the interface specific NTP servers. This command can be used only when
+ the interface is managed by <command>systemd-networkd</command>.</para></listitem>
+ </varlistentry>
+ </variablelist>
+
+ </refsect2>
+
+ </refsect1>
+
+ <refsect1>
+ <title>Options</title>
+
+ <para>The following options are understood:</para>
+
+ <variablelist>
+ <varlistentry>
+ <term><option>--no-ask-password</option></term>
+
+ <listitem><para>Do not query the user for authentication for
+ privileged operations.</para></listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><option>--adjust-system-clock</option></term>
+
+ <listitem><para>If <command>set-local-rtc</command> is invoked
+ and this option is passed, the system clock is synchronized
+ from the RTC again, taking the new setting into account.
+ Otherwise, the RTC is synchronized from the system
+ clock.</para></listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><option>--monitor</option></term>
+
+ <listitem><para>If <command>timesync-status</command> is invoked and this option is passed, then
+ <command>timedatectl</command> monitors the status of
+ <citerefentry><refentrytitle>systemd-timesyncd.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>
+ and updates the outputs. Use <keycombo><keycap>Ctrl</keycap><keycap>C</keycap></keycombo> to terminate the
+ monitoring.</para></listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><option>-a</option></term>
+ <term><option>--all</option></term>
+
+ <listitem><para>When showing properties of
+ <citerefentry><refentrytitle>systemd-timesyncd.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
+ show all properties regardless of whether they are set or not.</para></listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><option>-p</option></term>
+ <term><option>--property=</option></term>
+
+ <listitem><para>When showing properties of
+ <citerefentry><refentrytitle>systemd-timesyncd.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
+ limit display to certain properties as specified as argument. If not specified, all set properties are shown.
+ The argument should be a property name, such as <literal>ServerName</literal>. If specified more than once,
+ all properties with the specified names are shown.</para></listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><option>--value</option></term>
+
+ <listitem>
+ <para>When printing properties with <command>show-timesync</command>, only print the value, and skip the
+ property name and <literal>=</literal>.</para></listitem>
+ </varlistentry>
+
+ <xi:include href="user-system-options.xml" xpointer="host" />
+ <xi:include href="user-system-options.xml" xpointer="machine" />
+
+ <xi:include href="standard-options.xml" xpointer="help" />
+ <xi:include href="standard-options.xml" xpointer="version" />
+ <xi:include href="standard-options.xml" xpointer="no-pager" />
+ </variablelist>
</refsect1>
<refsect1>
<title>Exit status</title>
- <para>On success, 0 is returned, a non-zero failure
- code otherwise.</para>
+ <para>On success, 0 is returned, a non-zero failure code otherwise.</para>
</refsect1>
<xi:include href="less-variables.xml" />
<title>Examples</title>
<para>Show current settings:
<programlisting>$ timedatectl
- Local time: Thu 2017-09-21 16:08:56 CEST
- Universal time: Thu 2017-09-21 14:08:56 UTC
- RTC time: Thu 2017-09-21 14:08:56
- Time zone: Europe/Warsaw (CEST, +0200)
- System clock synchronized: yes
-systemd-timesyncd.service active: yes
- RTC in local TZ: no</programlisting>
+ Local time: Thu 2017-09-21 16:08:56 CEST
+ Universal time: Thu 2017-09-21 14:08:56 UTC
+ RTC time: Thu 2017-09-21 14:08:56
+ Time zone: Europe/Warsaw (CEST, +0200)
+System clock synchronized: yes
+ NTP service: active
+ RTC in local TZ: no</programlisting>
</para>
<para>Enable network time synchronization:
└─595 /usr/lib/systemd/systemd-timesyncd
…</programlisting>
</para>
+
+ <para>Show current status of
+ <citerefentry><refentrytitle>systemd-timesyncd.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>:
+ <programlisting>$ timedatectl timesync-status
+ Server: 216.239.38.15 (time4.google.com)
+Poll interval: 1min 4s (min: 32s; max 34min 8s)
+ Leap: normal
+ Version: 4
+ Stratum: 1
+ Reference: GPS
+ Precision: 1us (-20)
+Root distance: 335us (max: 5s)
+ Offset: +316us
+ Delay: 349us
+ Jitter: 0
+ Packet count: 1
+ Frequency: -8.802ppm</programlisting>
+ </para>
+
</refsect1>
<refsect1>
projects / thirdparty / systemd.git / blobdiff