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

NAME
       timesyncd.conf, timesyncd.conf.d - Network Time Synchronization
       configuration files

SYNOPSIS
       /etc/systemd/timesyncd.conf

       /etc/systemd/timesyncd.conf.d/*.conf

       /run/systemd/timesyncd.conf.d/*.conf

       /usr/lib/systemd/timesyncd.conf.d/*.conf

DESCRIPTION
       These configuration files control NTP network time synchronization. See
       systemd.syntax(5) for a general description of the syntax.

CONFIGURATION DIRECTORIES AND PRECEDENCE
       The default configuration is defined during compilation, so a
       configuration file is only needed when it is necessary to deviate from
       those defaults. By default, the configuration file in /etc/systemd/
       contains commented out entries showing the defaults as a guide to the
       administrator. This file can be edited to create local overrides.

       When packages need to customize the configuration, they can install
       configuration snippets in /usr/lib/systemd/*.conf.d/. Files in /etc/
       are reserved for the local administrator, who may use this logic to
       override the configuration files installed by vendor packages. The main
       configuration file is read before any of the configuration directories,
       and has the lowest precedence; entries in a file in any configuration
       directory override entries in the single configuration file. Files in
       the *.conf.d/ configuration subdirectories are sorted by their filename
       in lexicographic order, regardless of which of the subdirectories they
       reside in. When multiple files specify the same option, for options
       which accept just a single value, the entry in the file with the
       lexicographically latest name takes precedence. For options which
       accept a list of values, entries are collected as they occur in files
       sorted lexicographically. It is recommended to prefix all filenames in
       those subdirectories with a two-digit number and a dash, to simplify
       the ordering of the files.

       To disable a configuration file supplied by the vendor, the recommended
       way is to place a symlink to /dev/null in the configuration directory
       in /etc/, with the same filename as the vendor configuration file.

OPTIONS
       The following settings are configured in the "[Time]" section:

       NTP=
           A space-separated list of NTP server host names or IP addresses.
           During runtime this list is combined with any per-interface NTP
           servers acquired from systemd-networkd.service(8).
           systemd-timesyncd will contact all configured system or
           per-interface servers in turn until one is found that responds.
           When the empty string is assigned, the list of NTP servers is
           reset, and all assignments prior to this one will have no effect.
           This setting defaults to an empty list.

       FallbackNTP=
           A space-separated list of NTP server host names or IP addresses to
           be used as the fallback NTP servers. Any per-interface NTP servers
           obtained from systemd-networkd.service(8) take precedence over this
           setting, as do any servers set via NTP= above. This setting is
           hence only used if no other NTP server information is known. When
           the empty string is assigned, the list of NTP servers is reset, and
           all assignments prior to this one will have no effect. If this
           option is not given, a compiled-in list of NTP servers is used
           instead.

       RootDistanceMaxSec=
           Maximum acceptable root distance. Takes a time value (in seconds).
           Defaults to 5 seconds.

       PollIntervalMinSec=, PollIntervalMaxSec=
           The minimum and maximum poll intervals for NTP messages. Each
           setting takes a time value (in seconds).  PollIntervalMinSec= must
           not be smaller than 16 seconds.  PollIntervalMaxSec= must be larger
           than PollIntervalMinSec=.  PollIntervalMinSec= defaults to 32
           seconds, and PollIntervalMaxSec= defaults to 2048 seconds.

SEE ALSO
       systemd(1), systemd-timesyncd.service(8), systemd-networkd.service(8)

systemd 241                                                  TIMESYNCD.CONF(5)