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83620960 | 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+ --> |
83620960 | 5 | |
56ba3c78 | 6 | <refentry id="systemd-timedated.service" conditional='ENABLE_TIMEDATED'> |
83620960 | 7 | |
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8 | <refentryinfo> |
9 | <title>systemd-timedated.service</title> | |
10 | <productname>systemd</productname> | |
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11 | </refentryinfo> |
12 | ||
13 | <refmeta> | |
14 | <refentrytitle>systemd-timedated.service</refentrytitle> | |
15 | <manvolnum>8</manvolnum> | |
16 | </refmeta> | |
17 | ||
18 | <refnamediv> | |
19 | <refname>systemd-timedated.service</refname> | |
20 | <refname>systemd-timedated</refname> | |
21 | <refpurpose>Time and date bus mechanism</refpurpose> | |
22 | </refnamediv> | |
23 | ||
24 | <refsynopsisdiv> | |
25 | <para><filename>systemd-timedated.service</filename></para> | |
12b42c76 | 26 | <para><filename>/usr/lib/systemd/systemd-timedated</filename></para> |
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27 | </refsynopsisdiv> |
28 | ||
29 | <refsect1> | |
30 | <title>Description</title> | |
31 | ||
32 | <para><filename>systemd-timedated</filename> is a system service | |
33 | that may be used as a mechanism to change the system clock and | |
afaae43b | 34 | timezone, as well as to enable/disable network time synchronization. |
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35 | <filename>systemd-timedated</filename> is automatically activated |
36 | on request and terminates itself when it is unused.</para> | |
37 | ||
38 | <para>The tool | |
39 | <citerefentry><refentrytitle>timedatectl</refentrytitle><manvolnum>1</manvolnum></citerefentry> | |
40 | is a command line client to this service.</para> | |
41 | ||
42 | <para>See the <ulink | |
28a0ad81 | 43 | url="https://www.freedesktop.org/wiki/Software/systemd/timedated"> |
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44 | developer documentation</ulink> for information about the APIs |
45 | <filename>systemd-timedated</filename> provides.</para> | |
46 | </refsect1> | |
47 | ||
326208e0 | 48 | <refsect1> |
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49 | <title>List of network time synchronization services</title> |
50 | ||
51 | <para><command>systemd-timesyncd</command> will look for files with a <literal>.list</literal> extension | |
52 | in <filename>ntp-units.d/</filename> directories. Each file is parsed as a list of unit names, one per | |
53 | line. Empty lines and lines with comments (<literal>#</literal>) are ignored. Files are read from | |
54 | <filename>/usr/lib/systemd/ntp-units.d/</filename> and the corresponding directories under | |
55 | <filename>/etc/</filename>, <filename>/run/</filename>, <filename>/usr/local/lib/</filename>. Files in | |
56 | <filename>/etc/</filename> override files with the same name in <filename>/run/</filename>, | |
57 | <filename>/usr/local/lib/</filename>, and <filename>/usr/lib/</filename>. Files in | |
58 | <filename>/run/</filename> override files with the same name under <filename>/usr/</filename>. Packages | |
59 | should install their configuration files in <filename>/usr/lib/</filename> (distribution packages) or | |
60 | <filename>/usr/local/lib/</filename> (local installs).</para> | |
61 | ||
62 | <example> | |
63 | <title><filename>ntp-units.d/</filename> entry for <command>systemd-timesyncd</command></title> | |
64 | <programlisting># /usr/lib/systemd/ntp-units.d/80-systemd-timesync.list | |
65 | systemd-timesyncd.service | |
66 | </programlisting> | |
67 | </example> | |
68 | ||
69 | <para>If the environment variable <varname>$SYSTEMD_TIMEDATED_NTP_SERVICES</varname> is set, | |
70 | <command>systemd-timesyncd</command> will parse the contents of that variable as a colon-separated list | |
71 | of unit names. When set, this variable overrides the file-based list described above.</para> | |
72 | ||
73 | <example> | |
74 | <title>An override that specifies that <command>chronyd</command> should be used if available</title> | |
75 | <programlisting>SYSTEMD_TIMEDATED_NTP_SERVICES=chronyd.service:systemd-timesyncd.service</programlisting> | |
76 | </example> | |
326208e0 | 77 | </refsect1> |
afaae43b | 78 | |
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79 | <refsect1> |
80 | <title>See Also</title> | |
81 | <para> | |
82 | <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>, | |
83 | <citerefentry><refentrytitle>timedatectl</refentrytitle><manvolnum>1</manvolnum></citerefentry>, | |
84 | <citerefentry><refentrytitle>localtime</refentrytitle><manvolnum>5</manvolnum></citerefentry>, | |
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85 | <citerefentry project='man-pages'><refentrytitle>hwclock</refentrytitle><manvolnum>8</manvolnum></citerefentry>, |
86 | <citerefentry><refentrytitle>systemd-timesyncd</refentrytitle><manvolnum>8</manvolnum></citerefentry> | |
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87 | </para> |
88 | </refsect1> | |
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89 | |
90 | </refentry> |