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874ff7bf | 1 | <?xml version='1.0'?> <!--*-nxml-*--> |
874ff7bf | 2 | <!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN" |
12b42c76 | 3 | "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd"> |
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4 | |
5 | <!-- | |
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6 | SPDX-License-Identifier: LGPL-2.1+ |
7 | ||
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8 | This file is part of systemd. |
9 | ||
10 | Copyright 2014 Lennart Poettering | |
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11 | --> |
12 | ||
be795898 | 13 | <refentry id="timesyncd.conf" conditional='ENABLE_TIMESYNCD' |
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14 | xmlns:xi="http://www.w3.org/2001/XInclude"> |
15 | <refentryinfo> | |
16 | <title>timesyncd.conf</title> | |
17 | <productname>systemd</productname> | |
18 | ||
19 | <authorgroup> | |
20 | <author> | |
21 | <contrib>Developer</contrib> | |
22 | <firstname>Lennart</firstname> | |
23 | <surname>Poettering</surname> | |
24 | <email>lennart@poettering.net</email> | |
25 | </author> | |
26 | </authorgroup> | |
27 | </refentryinfo> | |
28 | ||
29 | <refmeta> | |
30 | <refentrytitle>timesyncd.conf</refentrytitle> | |
31 | <manvolnum>5</manvolnum> | |
32 | </refmeta> | |
33 | ||
34 | <refnamediv> | |
35 | <refname>timesyncd.conf</refname> | |
36 | <refname>timesyncd.conf.d</refname> | |
37 | <refpurpose>Network Time Synchronization configuration files</refpurpose> | |
38 | </refnamediv> | |
39 | ||
40 | <refsynopsisdiv> | |
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41 | <para><filename>/etc/systemd/timesyncd.conf</filename></para> |
42 | <para><filename>/etc/systemd/timesyncd.conf.d/*.conf</filename></para> | |
798d3a52 | 43 | <para><filename>/run/systemd/timesyncd.conf.d/*.conf</filename></para> |
12b42c76 | 44 | <para><filename>/usr/lib/systemd/timesyncd.conf.d/*.conf</filename></para> |
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45 | </refsynopsisdiv> |
46 | ||
47 | <refsect1> | |
48 | <title>Description</title> | |
49 | ||
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50 | <para>These configuration files control NTP network time synchronization. See |
51 | <citerefentry><refentrytitle>systemd.syntax</refentrytitle><manvolnum>5</manvolnum></citerefentry> | |
52 | for a general description of the syntax.</para> | |
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53 | </refsect1> |
54 | ||
e93549ef | 55 | <xi:include href="standard-conf.xml" xpointer="main-conf" /> |
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56 | |
57 | <refsect1> | |
58 | <title>Options</title> | |
59 | ||
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60 | <para>The following settings are configured in the <literal>[Time]</literal> section:</para> |
61 | ||
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62 | <variablelist class='network-directives'> |
63 | ||
64 | <varlistentry> | |
65 | <term><varname>NTP=</varname></term> | |
b938cb90 | 66 | <listitem><para>A space-separated list of NTP server host |
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67 | names or IP addresses. During runtime this list is combined |
68 | with any per-interface NTP servers acquired from | |
69 | <citerefentry><refentrytitle>systemd-networkd.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>. | |
70 | systemd-timesyncd will contact all configured system or | |
71 | per-interface servers in turn until one is found that | |
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72 | responds. When the empty string is assigned, the list of |
73 | NTP servers is reset, and all assignments prior to this one | |
74 | will have no effect. This setting defaults to an empty | |
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75 | list.</para></listitem> |
76 | </varlistentry> | |
77 | ||
78 | <varlistentry> | |
79 | <term><varname>FallbackNTP=</varname></term> | |
b938cb90 | 80 | <listitem><para>A space-separated list of NTP server host |
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81 | names or IP addresses to be used as the fallback NTP servers. |
82 | Any per-interface NTP servers obtained from | |
83 | <citerefentry><refentrytitle>systemd-networkd.service</refentrytitle><manvolnum>8</manvolnum></citerefentry> | |
84 | take precedence over this setting, as do any servers set via | |
85 | <varname>NTP=</varname> above. This setting is hence only used | |
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86 | if no other NTP server information is known. When the empty |
87 | string is assigned, the list of NTP servers is reset, | |
88 | and all assignments prior to this one will have no effect. | |
89 | If this option is not given, a compiled-in list of NTP servers | |
90 | is used instead.</para></listitem> | |
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91 | </varlistentry> |
92 | ||
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93 | <varlistentry> |
94 | <term><varname>RootDistanceMaxSec=</varname></term> | |
a4465d0d | 95 | <listitem><para>Maximum acceptable root distance. Takes a time value (in seconds). |
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96 | Defaults to 5 seconds.</para></listitem> |
97 | </varlistentry> | |
98 | ||
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99 | <varlistentry> |
100 | <term><varname>PollIntervalMinSec=</varname></term> | |
101 | <term><varname>PollIntervalMaxSec=</varname></term> | |
102 | <listitem><para>The minimum and maximum poll intervals for NTP messages. | |
103 | Each setting takes a time value (in seconds). | |
104 | <varname>PollIntervalMinSec=</varname> must not be smaller than 16 seconds. | |
105 | <varname>PollIntervalMaxSec=</varname> must be larger than <varname>PollIntervalMinSec=</varname>. | |
106 | <varname>PollIntervalMinSec=</varname> defaults to 32 seconds, and | |
107 | <varname>PollIntervalMaxSec=</varname> defaults to 2048 seconds.</para></listitem> | |
108 | </varlistentry> | |
109 | ||
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110 | </variablelist> |
111 | </refsect1> | |
112 | ||
113 | <refsect1> | |
114 | <title>See Also</title> | |
115 | <para> | |
116 | <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>, | |
117 | <citerefentry><refentrytitle>systemd-timesyncd.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>, | |
118 | <citerefentry><refentrytitle>systemd-networkd.service</refentrytitle><manvolnum>8</manvolnum></citerefentry> | |
119 | </para> | |
120 | </refsect1> | |
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121 | |
122 | </refentry> |