timesyncd.conf

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(7) for a general description of the syntax.

CONFIGURATION DIRECTORIES AND PRECEDENCE
       The default configuration is set during compilation, so configuration is
       only needed when it is necessary to deviate from those defaults.
       Initially, the main configuration file in /etc/systemd/ contains
       commented out entries showing the defaults as a guide to the
       administrator. Local overrides can be created by editing this file or by
       creating drop-ins, as described below. Using drop-ins for local
       configuration is recommended over modifications to the main configuration
       file.

       In addition to the "main" configuration file, drop-in configuration
       snippets are read from /usr/lib/systemd/*.conf.d/,
       /usr/local/lib/systemd/*.conf.d/, and /etc/systemd/*.conf.d/. Those
       drop-ins have higher precedence and override the main 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
       sorted last takes precedence, and for options which accept a list of
       values, entries are collected as they occur in the sorted files.

       When packages need to customize the configuration, they can install
       drop-ins under /usr/. Files in /etc/ are reserved for the local
       administrator, who may use this logic to override the configuration files
       installed by vendor packages. Drop-ins have to be used to override
       package drop-ins, since the main configuration file has lower precedence.
       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 247                                                    TIMESYNCD.CONF(5)