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(7) 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/ 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

       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 245                                                                                    TIMESYNCD.CONF(5)