92 lines
3.5 KiB
XML
92 lines
3.5 KiB
XML
<?xml version='1.0'?> <!--*-nxml-*-->
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<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
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"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
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<!--
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SPDX-License-Identifier: LGPL-2.1+
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This file is part of systemd.
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Copyright 2018 Peter A. Bigot
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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-->
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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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<authorgroup>
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<author>
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<contrib>Developer</contrib>
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<firstname>Peter</firstname>
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<surname>Bigot</surname>
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<email>pab@pabigot.com</email>
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</author>
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</authorgroup>
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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 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 depend on
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<filename>time-sync.target</filename> until <filename>systemd-timesyncd.service</filename> or something else has
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set the system time and marked it as synchronized. Reaching this state generally requires synchronization with an
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external source, such as an NTP server.</para>
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<para>When this unit is not enabled the <filename>time-sync.target</filename> synchronization point may be reached
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as soon as the system time is advanced by <filename>systemd-timesyncd.service</filename> to the time stored at the
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last shutdown. That time may not meet the expectations of dependent services that require an accurate
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clock.</para>
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</refsect1>
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<refsect1>
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<title>Notes</title>
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<para>This service works correctly with a time synchronization service like
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<filename>systemd-timesyncd.service</filename> that uses the same protocol as NTP to set the time from a
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synchronized source. When used with time synchronization services that follow a different protocol the event of
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setting synchronized time may not be detected in which case this service will not complete.</para>
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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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