1TIMESYNCD.CONF(5)               timesyncd.conf               TIMESYNCD.CONF(5)
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NAME

6       timesyncd.conf, timesyncd.conf.d - Network Time Synchronization
7       configuration files
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SYNOPSIS

10       /etc/systemd/timesyncd.conf
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12       /etc/systemd/timesyncd.conf.d/*.conf
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14       /run/systemd/timesyncd.conf.d/*.conf
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16       /usr/lib/systemd/timesyncd.conf.d/*.conf
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DESCRIPTION

19       These configuration files control NTP network time synchronization. See
20       systemd.syntax(5) for a general description of the syntax.
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CONFIGURATION DIRECTORIES AND PRECEDENCE

23       The default configuration is defined during compilation, so a
24       configuration file is only needed when it is necessary to deviate from
25       those defaults. By default, the configuration file in /etc/systemd/
26       contains commented out entries showing the defaults as a guide to the
27       administrator. This file can be edited to create local overrides.
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29       When packages need to customize the configuration, they can install
30       configuration snippets in /usr/lib/systemd/*.conf.d/. Files in /etc/
31       are reserved for the local administrator, who may use this logic to
32       override the configuration files installed by vendor packages. The main
33       configuration file is read before any of the configuration directories,
34       and has the lowest precedence; entries in a file in any configuration
35       directory override entries in the single configuration file. Files in
36       the *.conf.d/ configuration subdirectories are sorted by their filename
37       in lexicographic order, regardless of which of the subdirectories they
38       reside in. When multiple files specify the same option, for options
39       which accept just a single value, the entry in the file with the
40       lexicographically latest name takes precedence. For options which
41       accept a list of values, entries are collected as they occur in files
42       sorted lexicographically. It is recommended to prefix all filenames in
43       those subdirectories with a two-digit number and a dash, to simplify
44       the ordering of the files.
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46       To disable a configuration file supplied by the vendor, the recommended
47       way is to place a symlink to /dev/null in the configuration directory
48       in /etc/, with the same filename as the vendor configuration file.
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OPTIONS

51       The following settings are configured in the "[Time]" section:
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53       NTP=
54           A space-separated list of NTP server host names or IP addresses.
55           During runtime this list is combined with any per-interface NTP
56           servers acquired from systemd-networkd.service(8).
57           systemd-timesyncd will contact all configured system or
58           per-interface servers in turn until one is found that responds.
59           When the empty string is assigned, the list of NTP servers is
60           reset, and all assignments prior to this one will have no effect.
61           This setting defaults to an empty list.
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63       FallbackNTP=
64           A space-separated list of NTP server host names or IP addresses to
65           be used as the fallback NTP servers. Any per-interface NTP servers
66           obtained from systemd-networkd.service(8) take precedence over this
67           setting, as do any servers set via NTP= above. This setting is
68           hence only used if no other NTP server information is known. When
69           the empty string is assigned, the list of NTP servers is reset, and
70           all assignments prior to this one will have no effect. If this
71           option is not given, a compiled-in list of NTP servers is used
72           instead.
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74       RootDistanceMaxSec=
75           Maximum acceptable root distance. Takes a time value (in seconds).
76           Defaults to 5 seconds.
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78       PollIntervalMinSec=, PollIntervalMaxSec=
79           The minimum and maximum poll intervals for NTP messages. Each
80           setting takes a time value (in seconds).  PollIntervalMinSec= must
81           not be smaller than 16 seconds.  PollIntervalMaxSec= must be larger
82           than PollIntervalMinSec=.  PollIntervalMinSec= defaults to 32
83           seconds, and PollIntervalMaxSec= defaults to 2048 seconds.
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SEE ALSO

86       systemd(1), systemd-timesyncd.service(8), systemd-networkd.service(8)
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90systemd 239                                                  TIMESYNCD.CONF(5)
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