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<html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>systemd-timesyncd.service</title><meta name="generator" content="DocBook XSL Stylesheets V1.78.1"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><style>
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</style><a href="index.html">Index </a>·
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<a href="../libudev/index.html">gudev </a><span style="float:right">systemd 219</span><hr><div class="refentry"><a name="systemd-timesyncd.service"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>systemd-timesyncd.service, systemd-timesyncd — Network Time Synchronization</p></div><div class="refsynopsisdiv"><h2>Synopsis</h2><p><code class="filename">systemd-timesyncd.service</code></p><p><code class="filename">/usr/lib/systemd/systemd-timesyncd</code></p></div><div class="refsect1"><a name="idm139793339620336"></a><h2 id="Description">Description<a class="headerlink" title="Permalink to this headline" href="#Description">¶</a></h2><p><code class="filename">systemd-timesyncd</code> 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.</p><p>The NTP servers contacted are determined from the global
settings in
<a href="timesyncd.conf.html"><span class="citerefentry"><span class="refentrytitle">timesyncd.conf</span>(5)</span></a>,
the per-link static settings in <code class="filename">.network</code>
files, and the per-link dynamic settings received over DHCP. See
<a href="systemd.network.html"><span class="citerefentry"><span class="refentrytitle">systemd.network</span>(5)</span></a>
for more details.</p></div><div class="refsect1"><a name="idm139793339615376"></a><h2 id="Files">Files<a class="headerlink" title="Permalink to this headline" href="#Files">¶</a></h2><div class="variablelist"><dl class="variablelist"><dt id="/var/lib/systemd/clock"><span class="term"><code class="filename">/var/lib/systemd/clock</code></span><a class="headerlink" title="Permalink to this term" href="#/var/lib/systemd/clock">¶</a></dt><dd><p>This file contains the timestamp of last successful
synchronization.</p></dd></dl></div></div><div class="refsect1"><a name="idm139793339612176"></a><h2 id="See Also">See Also<a class="headerlink" title="Permalink to this headline" href="#See%20Also">¶</a></h2><p>
<a href="systemd.html"><span class="citerefentry"><span class="refentrytitle">systemd</span>(1)</span></a>,
<a href="timesyncd.conf.html"><span class="citerefentry"><span class="refentrytitle">timesyncd.conf</span>(5)</span></a>,
<a href="systemd.network.html"><span class="citerefentry"><span class="refentrytitle">systemd.network</span>(5)</span></a>,
<a href="systemd-networkd.service.html"><span class="citerefentry"><span class="refentrytitle">systemd-networkd.service</span>(8)</span></a>,
<a href="timedatectl.html"><span class="citerefentry"><span class="refentrytitle">timedatectl</span>(1)</span></a>,
<a href="localtime.html"><span class="citerefentry"><span class="refentrytitle">localtime</span>(5)</span></a>,
<a href="http://man7.org/linux/man-pages/man8/hwclock.8.html"><span class="citerefentry"><span class="refentrytitle">hwclock</span>(8)</span></a>
</p></div></div></body></html>
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