timesyncd.conf, timesyncd.conf.d — Network Time Synchronization configuration files
/etc/systemd/timesyncd.conf
/etc/systemd/timesyncd.conf.d/*.conf
/run/systemd/timesyncd.conf.d/*.conf
/usr/lib/systemd/timesyncd.conf.d/*.conf
Configuration files are read from directories in
/etc/, /run/, and
/usr/lib/, in order of precedence.
Each configuration file in these configuration directories shall be named in
the style of filename.conf/etc/ override files with the same name in
/run/ and /usr/lib/. Files in
/run/ override files with the same name in
/usr/lib/.
Packages should install their configuration files in
/usr/lib/. Files in /etc/ are
reserved for the local administrator, who may use this logic to override the
configuration files installed by vendor packages. All configuration files
are sorted by their filename in lexicographic order, regardless of which of
the directories they reside in. If multiple files specify the same option,
the entry in the file with the lexicographically latest name will take
precedence. It is recommended to prefix all filenames with a two-digit number
and a dash, to simplify the ordering of the files.
If the administrator wants 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.
Configuration is also read from a single configuration file in
/etc/. This 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.
NTP=¶A space separated list of NTP servers 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 the 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.