systemd-timedated.service, systemd-timedated - Time and date bus mechanism
systemd-timedated is a system service that may be used as a mechanism to change
the system clock and timezone, as well as to enable/disable network time
synchronization. systemd-timedated is automatically activated on request and
terminates itself when it is unused.
The tool timedatectl(1) is a command line client to this
See the developer documentation for information about
the APIs systemd-timedated provides.
systemd-timesyncd will look for files with a ".list" extension
in ntp-units.d/ directories. Each file is parsed as a list of unit names, one
per line. Empty lines and lines with comments ("#") are ignored.
Files are read from /usr/lib/systemd/ntp-units.d/ and the corresponding
directories under /etc/, /run/, /usr/local/lib/. Files in /etc/ override files
with the same name in /run/, /usr/local/lib/, and /usr/lib/. Files in /run/
override files with the same name under /usr/. Packages should install their
configuration files in /usr/lib/ (distribution packages) or /usr/local/lib/
Example 1. ntp-units.d/ entry for
If the environment variable $SYSTEMD_TIMEDATED_NTP_SERVICES
is set, systemd-timesyncd will parse the contents of that variable as
a colon-separated list of unit names. When set, this variable overrides the
file-based list described above.
Example 2. An override that specifies that
chronyd should be used if available
- developer documentation