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">
6 SPDX-License-Identifier: LGPL-2.1+
9 <refentry id=
"systemd-time-wait-sync.service" conditional='ENABLE_TIMESYNCD'
>
12 <title>systemd-time-wait-sync.service
</title>
13 <productname>systemd
</productname>
17 <refentrytitle>systemd-time-wait-sync.service
</refentrytitle>
18 <manvolnum>8</manvolnum>
22 <refname>systemd-time-wait-sync.service
</refname>
23 <refname>systemd-time-wait-sync
</refname>
24 <refpurpose>Wait Until Kernel Time Synchronized
</refpurpose>
28 <para><filename>systemd-time-wait-sync.service
</filename></para>
29 <para><filename>/usr/lib/systemd/systemd-time-wait-sync
</filename></para>
33 <title>Description
</title>
35 <para><filename>systemd-time-wait-sync
</filename> is a system service that delays the start of units that depend on
36 <filename>time-sync.target
</filename> until the system time has been synchronized with an accurate time source by
37 <filename>systemd-timesyncd.service
</filename>.
</para>
39 <para><filename>systemd-timesyncd.service
</filename> notifies on successful synchronization.
40 <filename>systemd-time-wait-sync
</filename> also tries to detect when the kernel marks the time as synchronized,
41 but this detection is not reliable and is intended only as a fallback for other servies that can be used to
42 synchronize time (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>
63 <title>See Also
</title>
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>,