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73e97bb064
With <para><filename>…</filename></para>, we get a separate "paragraph" for each line, i.e. entries separated by empty lines. This uses up a lot of space and was only done because docbook makes it hard to insert a newline. In some other places, <literallayout> was used, but then we cannot indent the source text (because the whitespace would end up in the final page). We can get the desired result with <simplelist>. With <simplelist> the items are indented in roff output, but not in html output. In some places this looks better then no indentation, and in others it would probably be better to have no indent. But this is a minor issue and we cannot control that. (I didn't convert all spots. There's a bunch of other man pages which have two lines, e.g. an executable and service file, and it doesn't matter there so much.)
145 lines
6.7 KiB
XML
145 lines
6.7 KiB
XML
<?xml version='1.0'?> <!--*-nxml-*-->
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<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
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"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
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<!-- SPDX-License-Identifier: LGPL-2.1-or-later -->
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<refentry id="timesyncd.conf" conditional='ENABLE_TIMESYNCD'
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xmlns:xi="http://www.w3.org/2001/XInclude">
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<refentryinfo>
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<title>timesyncd.conf</title>
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<productname>systemd</productname>
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</refentryinfo>
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<refmeta>
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<refentrytitle>timesyncd.conf</refentrytitle>
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<manvolnum>5</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>timesyncd.conf</refname>
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<refname>timesyncd.conf.d</refname>
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<refpurpose>Network Time Synchronization configuration files</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<para><simplelist>
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<member><filename>/etc/systemd/timesyncd.conf</filename></member>
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<member><filename>/etc/systemd/timesyncd.conf.d/*.conf</filename></member>
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<member><filename>/run/systemd/timesyncd.conf.d/*.conf</filename></member>
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<member><filename>/usr/lib/systemd/timesyncd.conf.d/*.conf</filename></member>
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</simplelist></para>
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</refsynopsisdiv>
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<refsect1>
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<title>Description</title>
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<para>These configuration files control NTP network time synchronization. See
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<citerefentry><refentrytitle>systemd.syntax</refentrytitle><manvolnum>7</manvolnum></citerefentry>
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for a general description of the syntax.</para>
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</refsect1>
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<xi:include href="standard-conf.xml" xpointer="main-conf" />
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<refsect1>
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<title>Options</title>
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<para>The following settings are configured in the [Time] section:</para>
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<variablelist class='network-directives'>
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<varlistentry>
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<term><varname>NTP=</varname></term>
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<listitem><para>A space-separated list of NTP server host names or IP addresses. During runtime this
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list is combined with any per-interface NTP servers acquired from
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<citerefentry><refentrytitle>systemd-networkd.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>.
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<command>systemd-timesyncd</command> will contact all configured system or per-interface servers in
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turn, until one responds. When the empty string is assigned, the list of NTP servers is reset, and
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all prior assignments will have no effect. This setting defaults to an empty list.</para>
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<xi:include href="version-info.xml" xpointer="v216"/></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>FallbackNTP=</varname></term>
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<listitem><para>A space-separated list of NTP server host names or IP addresses to be used as the
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fallback NTP servers. Any per-interface NTP servers obtained from
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<citerefentry><refentrytitle>systemd-networkd.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>
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take precedence over this setting, as do any servers set via <varname>NTP=</varname> above. This
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setting is hence only relevant if no other NTP server information is known. When the empty string is
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assigned, the list of NTP servers is reset, and all prior assignments will have no effect. If this
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option is not given, a compiled-in list of NTP servers is used.</para>
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<xi:include href="version-info.xml" xpointer="v216"/></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>RootDistanceMaxSec=</varname></term>
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<listitem><para>Maximum acceptable root distance, i.e. the maximum estimated time required for a
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packet to travel to the server we are connected to from the server with the reference clock. If
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the current server does not satisfy this limit, <command>systemd-timesyncd</command> will switch
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to a different server.</para>
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<para>Takes a time span value. The default unit is seconds, but other units may be specified, see
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<citerefentry><refentrytitle>systemd.time</refentrytitle><manvolnum>5</manvolnum></citerefentry>.
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Defaults to 5 seconds.</para>
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<xi:include href="version-info.xml" xpointer="v236"/></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>PollIntervalMinSec=</varname></term>
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<term><varname>PollIntervalMaxSec=</varname></term>
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<listitem><para>The minimum and maximum poll intervals for NTP messages. Polling starts at the
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minimum poll interval, and is adjusted within the specified limits in response to received packets.
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</para>
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<para>Each setting takes a time span value. The default unit is seconds, but other units may be
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specified, see
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<citerefentry><refentrytitle>systemd.time</refentrytitle><manvolnum>5</manvolnum></citerefentry>.
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<varname>PollIntervalMinSec=</varname> defaults to 32 seconds and must not be smaller than
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16 seconds. <varname>PollIntervalMaxSec=</varname> defaults to 34 min 8 s (2048 seconds) and must be
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larger than <varname>PollIntervalMinSec=</varname>.</para>
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<xi:include href="version-info.xml" xpointer="v236"/></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>ConnectionRetrySec=</varname></term>
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<listitem><para>Specifies the minimum delay before subsequent attempts to contact a new NTP server
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are made.</para>
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<para>Takes a time span value. The default unit is seconds, but other units may be specified, see
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<citerefentry><refentrytitle>systemd.time</refentrytitle><manvolnum>5</manvolnum></citerefentry>.
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Defaults to 30 seconds and must not be smaller than 1 second.</para>
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<xi:include href="version-info.xml" xpointer="v248"/></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>SaveIntervalSec=</varname></term>
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<listitem><para>The interval at which the current time is periodically saved to disk, in the absence
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of any recent synchronisation from an NTP server. This is especially useful for offline systems
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with no local RTC, as it will guarantee that the system clock remains roughly monotonic across
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reboots.</para>
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<para>Takes a time interval value. The default unit is seconds, but other units may be specified, see
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<citerefentry><refentrytitle>systemd.time</refentrytitle><manvolnum>5</manvolnum></citerefentry>.
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Defaults to 60 seconds.</para>
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<xi:include href="version-info.xml" xpointer="v250"/></listitem>
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</varlistentry>
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</variablelist>
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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-timesyncd.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>systemd-networkd.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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