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5c3376ef | 1 | <?xml version='1.0'?> <!--*-nxml-*--> |
3a54a157 | 2 | <!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN" |
5c3376ef | 3 | "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd"> |
db9ecf05 | 4 | <!-- SPDX-License-Identifier: LGPL-2.1-or-later --> |
5c3376ef | 5 | |
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6 | <refentry id="systemd-time-wait-sync.service" conditional='ENABLE_TIMESYNCD' |
7 | xmlns:xi="http://www.w3.org/2001/XInclude"> | |
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8 | |
9 | <refentryinfo> | |
10 | <title>systemd-time-wait-sync.service</title> | |
11 | <productname>systemd</productname> | |
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12 | </refentryinfo> |
13 | ||
14 | <refmeta> | |
15 | <refentrytitle>systemd-time-wait-sync.service</refentrytitle> | |
16 | <manvolnum>8</manvolnum> | |
17 | </refmeta> | |
18 | ||
19 | <refnamediv> | |
20 | <refname>systemd-time-wait-sync.service</refname> | |
21 | <refname>systemd-time-wait-sync</refname> | |
e9dd6984 | 22 | <refpurpose>Wait until kernel time is synchronized</refpurpose> |
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23 | </refnamediv> |
24 | ||
25 | <refsynopsisdiv> | |
26 | <para><filename>systemd-time-wait-sync.service</filename></para> | |
27 | <para><filename>/usr/lib/systemd/systemd-time-wait-sync</filename></para> | |
28 | </refsynopsisdiv> | |
29 | ||
30 | <refsect1> | |
31 | <title>Description</title> | |
32 | ||
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33 | <para><filename>systemd-time-wait-sync</filename> is a system service that delays the start of units that |
34 | are ordered after <filename>time-sync.target</filename> (see | |
35 | <citerefentry><refentrytitle>systemd.special</refentrytitle><manvolnum>7</manvolnum></citerefentry> for | |
36 | details) until the system time has been synchronized with an accurate remote reference time source by | |
2dd79846 | 37 | <filename>systemd-timesyncd.service</filename>.</para> |
5c3376ef | 38 | |
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39 | <para><filename>systemd-timesyncd.service</filename> notifies <filename>systemd-time-wait-sync</filename> |
40 | about successful synchronization. <filename>systemd-time-wait-sync</filename> also tries to detect when | |
41 | the kernel marks the system clock as synchronized, but this detection is not reliable and is intended | |
42 | only as a fallback for compatibility with alternative NTP services that can be used to synchronize time | |
43 | (e.g., ntpd, chronyd).</para> | |
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44 | </refsect1> |
45 | ||
46 | <refsect1> | |
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47 | <title>Files</title> |
48 | ||
49 | <variablelist> | |
50 | <varlistentry> | |
51 | <term><filename>/run/systemd/timesync/synchronized</filename></term> | |
52 | ||
53 | <listitem> | |
54 | <para>The presence of this file indicates to this service that the system clock has been synchronized.</para> | |
55 | </listitem> | |
56 | ||
57 | </varlistentry> | |
58 | </variablelist> | |
5c3376ef | 59 | |
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60 | </refsect1> |
61 | ||
62 | <refsect1> | |
63 | <title>See Also</title> | |
64 | <para> | |
65 | <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>, | |
66 | <citerefentry><refentrytitle>systemd.special</refentrytitle><manvolnum>7</manvolnum></citerefentry>, | |
67 | <citerefentry><refentrytitle>systemd-timesyncd.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>, | |
68 | </para> | |
69 | </refsect1> | |
70 | ||
71 | </refentry> |