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authorLuke Shumaker <lukeshu@lukeshu.com>2017-05-10 14:47:43 -0400
committerLuke Shumaker <lukeshu@lukeshu.com>2017-05-10 14:47:43 -0400
commit9fdd60e58532607eeda4e396bebea2c22143cac8 (patch)
tree68e002cbe5404a41f6cd0efb4d5bc34b29b6aedc /src/systemd-timesyncd/systemd-timesyncd.service.xml
parentd3e52cd56c638be8fd8fa332a25107a3ecc2346d (diff)
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+<?xml version='1.0'?> <!--*-nxml-*-->
+<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
+ "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
+
+<!--
+ This file is part of systemd.
+
+ Copyright 2014 Kay Sievers
+
+ systemd is free software; you can redistribute it and/or modify it
+ under the terms of the GNU Lesser General Public License as published by
+ the Free Software Foundation; either version 2.1 of the License, or
+ (at your option) any later version.
+
+ systemd is distributed in the hope that it will be useful, but
+ WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public License
+ along with systemd; If not, see <http://www.gnu.org/licenses/>.
+-->
+
+<refentry id="systemd-timesyncd.service" conditional='ENABLE_TIMESYNCD'>
+
+ <refentryinfo>
+ <title>systemd-timesyncd.service</title>
+ <productname>systemd</productname>
+
+ <authorgroup>
+ <author>
+ <contrib>Developer</contrib>
+ <firstname>Kay</firstname>
+ <surname>Sievers</surname>
+ <email>kay@vrfy.org</email>
+ </author>
+ </authorgroup>
+ </refentryinfo>
+
+ <refmeta>
+ <refentrytitle>systemd-timesyncd.service</refentrytitle>
+ <manvolnum>8</manvolnum>
+ </refmeta>
+
+ <refnamediv>
+ <refname>systemd-timesyncd.service</refname>
+ <refname>systemd-timesyncd</refname>
+ <refpurpose>Network Time Synchronization</refpurpose>
+ </refnamediv>
+
+ <refsynopsisdiv>
+ <para><filename>systemd-timesyncd.service</filename></para>
+ <para><filename>/usr/lib/systemd/systemd-timesyncd</filename></para>
+ </refsynopsisdiv>
+
+ <refsect1>
+ <title>Description</title>
+
+ <para><filename>systemd-timesyncd</filename> is a system service
+ that may be used to synchronize the local system clock with a
+ remote Network Time Protocol server. It also saves the local time
+ to disk every time the clock has been synchronized and uses this
+ to possibly advance the system realtime clock on subsequent
+ reboots to ensure it monotonically advances even if the system
+ lacks a battery-buffered RTC chip.</para>
+
+ <para>The NTP servers contacted are determined from the global
+ settings in
+ <citerefentry><refentrytitle>timesyncd.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
+ the per-link static settings in <filename>.network</filename>
+ files, and the per-link dynamic settings received over DHCP. See
+ <citerefentry><refentrytitle>systemd.network</refentrytitle><manvolnum>5</manvolnum></citerefentry>
+ for more details.</para>
+
+ <para><citerefentry><refentrytitle>timedatectl</refentrytitle><manvolnum>1</manvolnum></citerefentry>'s
+ <command>set-ntp</command> command may be used to enable and
+ start, or disable and stop this service.</para>
+ </refsect1>
+
+ <refsect1>
+ <title>Files</title>
+
+ <variablelist>
+ <varlistentry>
+ <term><filename>/var/lib/systemd/clock</filename></term>
+
+ <listitem>
+ <para>This file contains the timestamp of the last successful
+ synchronization.</para>
+ </listitem>
+ </varlistentry>
+ </variablelist>
+ </refsect1>
+
+ <refsect1>
+ <title>See Also</title>
+ <para>
+ <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
+ <citerefentry><refentrytitle>timesyncd.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
+ <citerefentry><refentrytitle>systemd.network</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
+ <citerefentry><refentrytitle>systemd-networkd.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
+ <citerefentry><refentrytitle>timedatectl</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
+ <citerefentry><refentrytitle>localtime</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
+ <citerefentry project='man-pages'><refentrytitle>hwclock</refentrytitle><manvolnum>8</manvolnum></citerefentry>
+ </para>
+ </refsect1>
+
+</refentry>