man/elogind-time-wait-sync.service.xml

   1 <?xml version='1.0'?> <!--*-nxml-*-->
   2 <!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
   3   "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
   4
   5 <!--
   6   SPDX-License-Identifier: LGPL-2.1+
   7
   8   This file is part of elogind.
   9
  10   Copyright 2018 Peter A. Bigot
  11 -->
  12
  13 <refentry id="elogind-time-wait-sync.service" conditional='ENABLE_TIMESYNCD'>
  14
  15   <refentryinfo>
  16     <title>elogind-time-wait-sync.service</title>
  17     <productname>elogind</productname>
  18
  19     <authorgroup>
  20       <author>
  21         <contrib>Developer</contrib>
  22         <firstname>Peter</firstname>
  23         <surname>Bigot</surname>
  24         <email>pab@pabigot.com</email>
  25       </author>
  26     </authorgroup>
  27   </refentryinfo>
  28
  29   <refmeta>
  30     <refentrytitle>elogind-time-wait-sync.service</refentrytitle>
  31     <manvolnum>8</manvolnum>
  32   </refmeta>
  33
  34   <refnamediv>
  35     <refname>elogind-time-wait-sync.service</refname>
  36     <refname>elogind-time-wait-sync</refname>
  37     <refpurpose>Wait Until Kernel Time Synchronized</refpurpose>
  38   </refnamediv>
  39
  40   <refsynopsisdiv>
  41     <para><filename>elogind-time-wait-sync.service</filename></para>
  42     <para><filename>/usr/lib/elogind/elogind-time-wait-sync</filename></para>
  43   </refsynopsisdiv>
  44
  45   <refsect1>
  46     <title>Description</title>
  47
  48     <para><filename>elogind-time-wait-sync</filename> is a system service that delays the start of units that depend on
  49     <filename>time-sync.target</filename> until the system time has been synchronized with an accurate time source by
  50     <filename>elogind-timesyncd.service</filename>.</para>
  51
  52     <para><filename>elogind-timesyncd.service</filename> notifies on successful synchronization.
  53     <filename>elogind-time-wait-sync</filename> also tries to detect when the kernel marks the time as synchronized,
  54     but this detection is not reliable and is intended only as a fallback for other servies that can be used to
  55     synchronize time (e.g., ntpd, chronyd).</para>
  56
  57   </refsect1>
  58
  59   <refsect1>
  60     <title>Files</title>
  61
  62     <variablelist>
  63       <varlistentry>
  64         <term><filename>/run/systemd/timesync/synchronized</filename></term>
  65
  66         <listitem>
  67           <para>The presence of this file indicates to this service that the system clock has been synchronized.</para>
  68         </listitem>
  69
  70       </varlistentry>
  71     </variablelist>
  72
  73   </refsect1>
  74
  75   <refsect1>
  76     <title>See Also</title>
  77     <para>
  78       <citerefentry><refentrytitle>elogind</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
  79       <citerefentry><refentrytitle>elogind.special</refentrytitle><manvolnum>7</manvolnum></citerefentry>,
  80       <citerefentry><refentrytitle>elogind-timesyncd.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
  81     </para>
  82   </refsect1>
  83
  84 </refentry>