mirror of
https://github.com/systemd/systemd-stable.git
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afaae43bb1
We removed support for foreign services (and ntp-units.d/) inb72ddf0f4. Support for foreign services was added back in5d280742, but through an environment variable. The problem with the env var approach is that it only works as a mechanism to select one item, and doesn't work nicely as a mechinism to create a list of items through drop-ins (because the env var can be easily overridden, but not extended). Having a list of "ntp providers" is important to be able to reliably disable all of them when that is requested. Another problem is that nobody ever bothered to care about our new "standard". ntp-units.d/ is a nice simple format that works and is already supported by chrony and ntpd and timedatex. If we were to introduce and ask people to follow a new standard, there should be some good reason for this. The idea with env vars has lower functionality, requires systemd-specific syntax. We should just re-adopt the format that we originally introduced and that seems to work for everyone, and more on to more interesting problems.
326 lines
13 KiB
XML
326 lines
13 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+ -->
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<refentry id="timedatectl" conditional='ENABLE_TIMEDATECTL'
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xmlns:xi="http://www.w3.org/2001/XInclude">
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<refentryinfo>
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<title>timedatectl</title>
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<productname>systemd</productname>
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</refentryinfo>
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<refmeta>
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<refentrytitle>timedatectl</refentrytitle>
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<manvolnum>1</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>timedatectl</refname>
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<refpurpose>Control the system time and date</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<cmdsynopsis>
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<command>timedatectl</command>
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<arg choice="opt" rep="repeat">OPTIONS</arg>
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<arg choice="req">COMMAND</arg>
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</cmdsynopsis>
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</refsynopsisdiv>
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<refsect1>
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<title>Description</title>
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<para><command>timedatectl</command> may be used to query and change the system clock and its settings,
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and enable or disable time synchronization services.</para>
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<para>Use
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<citerefentry><refentrytitle>systemd-firstboot</refentrytitle><manvolnum>1</manvolnum></citerefentry>
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to initialize the system time zone for mounted (but not booted)
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system images.</para>
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<para><command>timedatectl</command> may be used to show the current status of time synchronization
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services, for example
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<citerefentry><refentrytitle>systemd-timesyncd.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>.
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</para>
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</refsect1>
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<refsect1>
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<title>Options</title>
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<para>The following options are understood:</para>
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<variablelist>
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<varlistentry>
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<term><option>--no-ask-password</option></term>
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<listitem><para>Do not query the user for authentication for
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privileged operations.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>--adjust-system-clock</option></term>
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<listitem><para>If <command>set-local-rtc</command> is invoked
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and this option is passed, the system clock is synchronized
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from the RTC again, taking the new setting into account.
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Otherwise, the RTC is synchronized from the system
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clock.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>--monitor</option></term>
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<listitem><para>If <command>timesync-status</command> is invoked and this option is passed, then
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<command>timedatectl</command> monitors the status of
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<citerefentry><refentrytitle>systemd-timesyncd.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>
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and updates the outputs. Use <keycombo><keycap>Ctrl</keycap><keycap>C</keycap></keycombo> to terminate the
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monitoring.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>-a</option></term>
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<term><option>--all</option></term>
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<listitem><para>When showing properties of
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<citerefentry><refentrytitle>systemd-timesyncd.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
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show all properties regardless of whether they are set or not.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>-p</option></term>
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<term><option>--property=</option></term>
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<listitem><para>When showing properties of
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<citerefentry><refentrytitle>systemd-timesyncd.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
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limit display to certain properties as specified as argument. If not specified, all set properties are shown.
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The argument should be a property name, such as <literal>ServerName</literal>. If specified more than once,
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all properties with the specified names are shown.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>--value</option></term>
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<listitem>
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<para>When printing properties with <command>show-timesync</command>, only print the value, and skip the
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property name and <literal>=</literal>.</para></listitem>
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</varlistentry>
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<xi:include href="user-system-options.xml" xpointer="host" />
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<xi:include href="user-system-options.xml" xpointer="machine" />
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<xi:include href="standard-options.xml" xpointer="help" />
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<xi:include href="standard-options.xml" xpointer="version" />
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<xi:include href="standard-options.xml" xpointer="no-pager" />
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</variablelist>
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</refsect1>
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<refsect1>
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<title>Commands</title>
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<para>The following commands are understood:</para>
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<variablelist>
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<varlistentry>
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<term><command>status</command></term>
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<listitem><para>Show current settings of the system clock and RTC, including whether network time
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synchronization is active. If no command is specified, this is the implied default.
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</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><command>show</command></term>
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<listitem><para>Show the same information as <option>status</option>, but in machine readable form.
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This command is intended to be used whenever computer-parsable output is required.
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Use <option>status</option> if you are looking for formatted human-readable output.</para>
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<para>By default, empty properties are suppressed. Use <option>--all</option> to show those too.
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To select specific properties to show, use <option>--property=</option>.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><command>set-time [TIME]</command></term>
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<listitem><para>Set the system clock to the specified time.
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This will also update the RTC time accordingly. The time may
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be specified in the format "2012-10-30
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18:17:16".</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><command>set-timezone [TIMEZONE]</command></term>
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<listitem><para>Set the system time zone to the specified
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value. Available timezones can be listed with
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<command>list-timezones</command>. If the RTC is configured to
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be in the local time, this will also update the RTC time. This
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call will alter the <filename>/etc/localtime</filename>
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symlink. See
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<citerefentry><refentrytitle>localtime</refentrytitle><manvolnum>5</manvolnum></citerefentry>
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for more information.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><command>list-timezones</command></term>
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<listitem><para>List available time zones, one per line.
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Entries from the list can be set as the system timezone with
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<command>set-timezone</command>.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><command>set-local-rtc [BOOL]</command></term>
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<listitem><para>Takes a boolean argument. If
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<literal>0</literal>, the system is configured to maintain the
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RTC in universal time. If <literal>1</literal>, it will
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maintain the RTC in local time instead. Note that maintaining
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the RTC in the local timezone is not fully supported and will
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create various problems with time zone changes and daylight
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saving adjustments. If at all possible, keep the RTC in UTC
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mode. Note that invoking this will also synchronize the RTC
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from the system clock, unless
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<option>--adjust-system-clock</option> is passed (see above).
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This command will change the 3rd line of
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<filename>/etc/adjtime</filename>, as documented in
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<citerefentry project='man-pages'><refentrytitle>hwclock</refentrytitle><manvolnum>8</manvolnum></citerefentry>.
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</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><command>set-ntp [BOOL]</command></term>
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<listitem><para>Takes a boolean argument. Controls whether network time synchronization is active and
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enabled (if available). If the argument is true, this enables and starts the first existing network
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synchronization service. If the argument is false, then this disables and stops the known network
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synchronization services. The way that the list of services is built is described below.</para>
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</listitem>
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</varlistentry>
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</variablelist>
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<refsect2>
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<title>systemd-timesyncd Commands</title>
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<para>The following commands are specific to
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<citerefentry><refentrytitle>systemd-timesyncd.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>.
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</para>
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<variablelist>
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<varlistentry>
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<term><command>timesync-status</command></term>
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<listitem><para>Show current status of
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<citerefentry><refentrytitle>systemd-timesyncd.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>.
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If <option>--monitor</option> is specified, then this will monitor the status updates.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><command>show-timesync</command></term>
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<listitem><para>Show the same information as <option>timesync-status</option>, but in machine readable form.
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This command is intended to be used whenever computer-parsable output is required.
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Use <option>timesync-status</option> if you are looking for formatted human-readable output.</para>
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<para>By default, empty properties are suppressed. Use <option>--all</option> to show those too.
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To select specific properties to show, use <option>--property=</option>.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><command>ntp-servers <replaceable>INTERFACE</replaceable> <replaceable>SERVER</replaceable>…</command></term>
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<listitem><para>Set the interface specific NTP servers. This command can be used only when the
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interface is managed by <command>systemd-networkd</command>.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><command>revert <replaceable>INTERFACE</replaceable></command></term>
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<listitem><para>Revert the interface specific NTP servers. This command can be used only when
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the interface is managed by <command>systemd-networkd</command>.</para></listitem>
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</varlistentry>
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</variablelist>
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</refsect2>
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</refsect1>
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<refsect1>
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<title>Exit status</title>
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<para>On success, 0 is returned, a non-zero failure code otherwise.</para>
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</refsect1>
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<xi:include href="less-variables.xml" />
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<refsect1>
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<title>Examples</title>
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<para>Show current settings:
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<programlisting>$ timedatectl
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Local time: Thu 2017-09-21 16:08:56 CEST
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Universal time: Thu 2017-09-21 14:08:56 UTC
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RTC time: Thu 2017-09-21 14:08:56
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Time zone: Europe/Warsaw (CEST, +0200)
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System clock synchronized: yes
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NTP service: active
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RTC in local TZ: no</programlisting>
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</para>
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<para>Enable network time synchronization:
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<programlisting>$ timedatectl set-ntp true
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==== AUTHENTICATING FOR org.freedesktop.timedate1.set-ntp ===
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Authentication is required to control whether network time synchronization shall be enabled.
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Authenticating as: user
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Password: ********
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==== AUTHENTICATION COMPLETE ===</programlisting>
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<programlisting>$ systemctl status systemd-timesyncd.service
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● systemd-timesyncd.service - Network Time Synchronization
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Loaded: loaded (/usr/lib/systemd/system/systemd-timesyncd.service; enabled)
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Active: active (running) since Mo 2015-03-30 14:20:38 CEST; 5s ago
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Docs: man:systemd-timesyncd.service(8)
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Main PID: 595 (systemd-timesyn)
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Status: "Using Time Server 216.239.38.15:123 (time4.google.com)."
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CGroup: /system.slice/systemd-timesyncd.service
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└─595 /usr/lib/systemd/systemd-timesyncd
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…</programlisting>
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</para>
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<para>Show current status of
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<citerefentry><refentrytitle>systemd-timesyncd.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>:
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<programlisting>$ timedatectl timesync-status
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Server: 216.239.38.15 (time4.google.com)
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Poll interval: 1min 4s (min: 32s; max 34min 8s)
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Leap: normal
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Version: 4
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Stratum: 1
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Reference: GPS
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Precision: 1us (-20)
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Root distance: 335us (max: 5s)
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Offset: +316us
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Delay: 349us
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Jitter: 0
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Packet count: 1
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Frequency: -8.802ppm</programlisting>
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</para>
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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 project='man-pages'><refentrytitle>hwclock</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
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<citerefentry project='man-pages'><refentrytitle>date</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>localtime</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>systemctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>systemd-timedated.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>systemd-timesyncd.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>systemd-firstboot</refentrytitle><manvolnum>1</manvolnum></citerefentry>
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</para>
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</refsect1>
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</refentry>
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