1 <?xml version='
1.0'
?> <!--*-nxml-*-->
2 <!DOCTYPE refentry PUBLIC
"-//OASIS//DTD DocBook XML V4.5//EN"
3 "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
4 <!-- SPDX-License-Identifier: LGPL-2.1-or-later -->
6 <refentry id=
"systemd-time-wait-sync.service" conditional='ENABLE_TIMESYNCD'
7 xmlns:
xi=
"http://www.w3.org/2001/XInclude">
10 <title>systemd-time-wait-sync.service
</title>
11 <productname>systemd
</productname>
15 <refentrytitle>systemd-time-wait-sync.service
</refentrytitle>
16 <manvolnum>8</manvolnum>
20 <refname>systemd-time-wait-sync.service
</refname>
21 <refname>systemd-time-wait-sync
</refname>
22 <refpurpose>Wait until kernel time is synchronized
</refpurpose>
26 <para><filename>systemd-time-wait-sync.service
</filename></para>
27 <para><filename>/usr/lib/systemd/systemd-time-wait-sync
</filename></para>
31 <title>Description
</title>
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
37 <filename>systemd-timesyncd.service
</filename>.
</para>
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>
51 <term><filename>/run/systemd/timesync/synchronized
</filename></term>
54 <para>The presence of this file indicates to this service that the system clock has been synchronized.
</para>
56 <xi:include href=
"version-info.xml" xpointer=
"v239"/>
65 <title>See Also
</title>
67 <citerefentry><refentrytitle>systemd
</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
68 <citerefentry><refentrytitle>systemd.special
</refentrytitle><manvolnum>7</manvolnum></citerefentry>,
69 <citerefentry><refentrytitle>systemd-timesyncd.service
</refentrytitle><manvolnum>8</manvolnum></citerefentry>,