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b149d230ea
Let's link the three man pages together more tightly and explain what the two targets are about, emphasizing local/quick/reliable/approximate vs remote/slow/unreliable/accurate synchronization. Follow-up for:1431b2f701fe934b42e4
71 lines
2.6 KiB
XML
71 lines
2.6 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-time-wait-sync.service" conditional='ENABLE_TIMESYNCD'>
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<refentryinfo>
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<title>systemd-time-wait-sync.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-time-wait-sync.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-time-wait-sync.service</refname>
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<refname>systemd-time-wait-sync</refname>
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<refpurpose>Wait until kernel time is synchronized</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<para><filename>systemd-time-wait-sync.service</filename></para>
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<para><filename>/usr/lib/systemd/systemd-time-wait-sync</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-time-wait-sync</filename> is a system service that delays the start of units that
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are ordered after <filename>time-sync.target</filename> (see
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<citerefentry><refentrytitle>systemd.special</refentrytitle><manvolnum>7</manvolnum></citerefentry> for
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details) until the system time has been synchronized with an accurate remote reference time source by
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<filename>systemd-timesyncd.service</filename>.</para>
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<para><filename>systemd-timesyncd.service</filename> notifies <filename>systemd-time-wait-sync</filename>
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about successful synchronization. <filename>systemd-time-wait-sync</filename> also tries to detect when
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the kernel marks the system clock as synchronized, but this detection is not reliable and is intended
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only as a fallback for compatibility with alternative NTP services that can be used to synchronize time
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(e.g., ntpd, chronyd).</para>
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</refsect1>
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<refsect1>
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<title>Files</title>
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<variablelist>
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<varlistentry>
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<term><filename>/run/systemd/timesync/synchronized</filename></term>
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<listitem>
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<para>The presence of this file indicates to this service that the system clock has been synchronized.</para>
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</listitem>
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</varlistentry>
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</variablelist>
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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>systemd.special</refentrytitle><manvolnum>7</manvolnum></citerefentry>,
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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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</refentry>
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