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)