mirror of
https://github.com/systemd/systemd.git
synced 2024-12-26 03:22:00 +03:00
3a54a15760
The "include" files had type "book" for some raeason. I don't think this is meaningful. Let's just use the same everywhere. $ perl -i -0pe 's^..DOCTYPE (book|refentry) PUBLIC "-//OASIS//DTD DocBook XML V4.[25]//EN"\s+"http^<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"\n "http^gms' man/*.xml
105 lines
4.3 KiB
XML
105 lines
4.3 KiB
XML
<?xml version='1.0'?> <!--*-nxml-*-->
|
|
<!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+ -->
|
|
|
|
<refentry id="systemd-timesyncd.service" conditional='ENABLE_TIMESYNCD'>
|
|
|
|
<refentryinfo>
|
|
<title>systemd-timesyncd.service</title>
|
|
<productname>systemd</productname>
|
|
</refentryinfo>
|
|
|
|
<refmeta>
|
|
<refentrytitle>systemd-timesyncd.service</refentrytitle>
|
|
<manvolnum>8</manvolnum>
|
|
</refmeta>
|
|
|
|
<refnamediv>
|
|
<refname>systemd-timesyncd.service</refname>
|
|
<refname>systemd-timesyncd</refname>
|
|
<refpurpose>Network Time Synchronization</refpurpose>
|
|
</refnamediv>
|
|
|
|
<refsynopsisdiv>
|
|
<para><filename>systemd-timesyncd.service</filename></para>
|
|
<para><filename>/usr/lib/systemd/systemd-timesyncd</filename></para>
|
|
</refsynopsisdiv>
|
|
|
|
<refsect1>
|
|
<title>Description</title>
|
|
|
|
<para><filename>systemd-timesyncd</filename> is a system service
|
|
that may be used to synchronize the local system clock with a
|
|
remote Network Time Protocol server. It also saves the local time
|
|
to disk every time the clock has been synchronized and uses this
|
|
to possibly advance the system realtime clock on subsequent
|
|
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>,
|
|
the per-link static settings in <filename>.network</filename>
|
|
files, and the per-link dynamic settings received over DHCP. See
|
|
<citerefentry><refentrytitle>systemd.network</refentrytitle><manvolnum>5</manvolnum></citerefentry>
|
|
for more details.</para>
|
|
|
|
<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>
|
|
<title>Files</title>
|
|
|
|
<variablelist>
|
|
<varlistentry>
|
|
<term><filename>/var/lib/systemd/timesync/clock</filename></term>
|
|
|
|
<listitem>
|
|
<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>
|
|
|
|
<refsect1>
|
|
<title>See Also</title>
|
|
<para>
|
|
<citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
|
|
<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>
|
|
</para>
|
|
</refsect1>
|
|
|
|
</refentry>
|