Open Source Software

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.

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. If multiple files specify the same option, the entry in the
   file with the lexicographically latest name takes 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.
       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. If
       this option is not given, a compiled-in list of NTP servers is used
       instead.

SEE ALSO

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



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