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874ff7bf | 1 | <?xml version='1.0'?> <!--*-nxml-*--> |
3a54a157 | 2 | <!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN" |
12b42c76 | 3 | "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd"> |
0307f791 | 4 | <!-- SPDX-License-Identifier: LGPL-2.1+ --> |
874ff7bf | 5 | |
be795898 | 6 | <refentry id="timesyncd.conf" conditional='ENABLE_TIMESYNCD' |
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7 | xmlns:xi="http://www.w3.org/2001/XInclude"> |
8 | <refentryinfo> | |
9 | <title>timesyncd.conf</title> | |
10 | <productname>systemd</productname> | |
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11 | </refentryinfo> |
12 | ||
13 | <refmeta> | |
14 | <refentrytitle>timesyncd.conf</refentrytitle> | |
15 | <manvolnum>5</manvolnum> | |
16 | </refmeta> | |
17 | ||
18 | <refnamediv> | |
19 | <refname>timesyncd.conf</refname> | |
20 | <refname>timesyncd.conf.d</refname> | |
21 | <refpurpose>Network Time Synchronization configuration files</refpurpose> | |
22 | </refnamediv> | |
23 | ||
24 | <refsynopsisdiv> | |
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25 | <para><filename>/etc/systemd/timesyncd.conf</filename></para> |
26 | <para><filename>/etc/systemd/timesyncd.conf.d/*.conf</filename></para> | |
798d3a52 | 27 | <para><filename>/run/systemd/timesyncd.conf.d/*.conf</filename></para> |
12b42c76 | 28 | <para><filename>/usr/lib/systemd/timesyncd.conf.d/*.conf</filename></para> |
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29 | </refsynopsisdiv> |
30 | ||
31 | <refsect1> | |
32 | <title>Description</title> | |
33 | ||
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34 | <para>These configuration files control NTP network time synchronization. See |
35 | <citerefentry><refentrytitle>systemd.syntax</refentrytitle><manvolnum>5</manvolnum></citerefentry> | |
36 | for a general description of the syntax.</para> | |
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37 | </refsect1> |
38 | ||
e93549ef | 39 | <xi:include href="standard-conf.xml" xpointer="main-conf" /> |
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40 | |
41 | <refsect1> | |
42 | <title>Options</title> | |
43 | ||
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44 | <para>The following settings are configured in the <literal>[Time]</literal> section:</para> |
45 | ||
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46 | <variablelist class='network-directives'> |
47 | ||
48 | <varlistentry> | |
49 | <term><varname>NTP=</varname></term> | |
b938cb90 | 50 | <listitem><para>A space-separated list of NTP server host |
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51 | names or IP addresses. During runtime this list is combined |
52 | with any per-interface NTP servers acquired from | |
53 | <citerefentry><refentrytitle>systemd-networkd.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>. | |
54 | systemd-timesyncd will contact all configured system or | |
55 | per-interface servers in turn until one is found that | |
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56 | responds. When the empty string is assigned, the list of |
57 | NTP servers is reset, and all assignments prior to this one | |
58 | will have no effect. This setting defaults to an empty | |
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59 | list.</para></listitem> |
60 | </varlistentry> | |
61 | ||
62 | <varlistentry> | |
63 | <term><varname>FallbackNTP=</varname></term> | |
b938cb90 | 64 | <listitem><para>A space-separated list of NTP server host |
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65 | names or IP addresses to be used as the fallback NTP servers. |
66 | Any per-interface NTP servers obtained from | |
67 | <citerefentry><refentrytitle>systemd-networkd.service</refentrytitle><manvolnum>8</manvolnum></citerefentry> | |
68 | take precedence over this setting, as do any servers set via | |
69 | <varname>NTP=</varname> above. This setting is hence only used | |
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70 | if no other NTP server information is known. When the empty |
71 | string is assigned, the list of NTP servers is reset, | |
72 | and all assignments prior to this one will have no effect. | |
73 | If this option is not given, a compiled-in list of NTP servers | |
74 | is used instead.</para></listitem> | |
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75 | </varlistentry> |
76 | ||
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77 | <varlistentry> |
78 | <term><varname>RootDistanceMaxSec=</varname></term> | |
a4465d0d | 79 | <listitem><para>Maximum acceptable root distance. Takes a time value (in seconds). |
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80 | Defaults to 5 seconds.</para></listitem> |
81 | </varlistentry> | |
82 | ||
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83 | <varlistentry> |
84 | <term><varname>PollIntervalMinSec=</varname></term> | |
85 | <term><varname>PollIntervalMaxSec=</varname></term> | |
86 | <listitem><para>The minimum and maximum poll intervals for NTP messages. | |
87 | Each setting takes a time value (in seconds). | |
88 | <varname>PollIntervalMinSec=</varname> must not be smaller than 16 seconds. | |
89 | <varname>PollIntervalMaxSec=</varname> must be larger than <varname>PollIntervalMinSec=</varname>. | |
90 | <varname>PollIntervalMinSec=</varname> defaults to 32 seconds, and | |
91 | <varname>PollIntervalMaxSec=</varname> defaults to 2048 seconds.</para></listitem> | |
92 | </varlistentry> | |
93 | ||
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94 | </variablelist> |
95 | </refsect1> | |
96 | ||
97 | <refsect1> | |
98 | <title>See Also</title> | |
99 | <para> | |
100 | <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>, | |
101 | <citerefentry><refentrytitle>systemd-timesyncd.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>, | |
102 | <citerefentry><refentrytitle>systemd-networkd.service</refentrytitle><manvolnum>8</manvolnum></citerefentry> | |
103 | </para> | |
104 | </refsect1> | |
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105 | |
106 | </refentry> |