timesyncd.conf.d(5) — Linux manual page


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

NAME         top

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

SYNOPSIS         top





DESCRIPTION         top

       These configuration files control NTP network time synchronization.
       See systemd.syntax(7) for a general description of the syntax.


       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

       When packages need to customize the configuration, they can install
       configuration snippets in /usr/lib/systemd/*.conf.d/ or
       /usr/local/lib/systemd/*.conf.d/. 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 in which of the subdirectories
       they reside. 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.

       Files in /etc/ are reserved for the local administrator, who may use
       this logic to override the configuration files installed by vendor
       packages. 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         top

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

           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.

           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.

           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         top

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

COLOPHON         top

       This page is part of the systemd (systemd system and service manager)
       project.  Information about the project can be found at 
       ⟨http://www.freedesktop.org/wiki/Software/systemd⟩.  If you have a bug
       report for this manual page, see
       ⟨http://www.freedesktop.org/wiki/Software/systemd/#bugreports⟩.  This
       page was obtained from the project's upstream Git repository
       ⟨https://github.com/systemd/systemd.git⟩ on 2020-08-13.  (At that
       time, the date of the most recent commit that was found in the repos‐
       itory was 2020-08-11.)  If you discover any rendering problems in
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       of the original manual page), send a mail to man-pages@man7.org

systemd 246                                                TIMESYNCD.CONF(5)

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