SYSTEMD-TIMESYNCD.SERVICE(8)stemd-timesyncd.serviceTEMD-TIMESYNCD.SERVICE(8)
systemd-timesyncd.service, systemd-timesyncd - Network Time
Synchronization
systemd-timesyncd.service
/usr/lib/systemd/systemd-timesyncd
systemd-timesyncd is a system service that may be used to synchronize
the local system clock with a remote Network Time Protocol server. It
also saves the local time to disk every time the clock has been
synchronized and uses this to possibly advance the system realtime
clock on subsequent reboots to ensure it monotonically advances even
if the system lacks a battery-buffered RTC chip.
The systemd-timesyncd service specifically implements only SNTP. This
minimalistic service will set the system clock for large offsets or
slowly adjust it for smaller deltas. More complex use cases are not
covered by systemd-timesyncd.
The NTP servers contacted are determined from the global settings in
timesyncd.conf(5), the per-link static settings in .network files,
and the per-link dynamic settings received over DHCP. See
systemd.network(5) for more details.
timedatectl(1)'s set-ntp command may be used to enable and start, or
disable and stop this service.
timedatectl(1)'s timesync-status or show-timesync command can be used
to show the current status of this service.
/var/lib/systemd/timesync/clock
The modification time of this file indicates the timestamp of the
last successful synchronization (or at least the systemd build
date, in case synchronization was not possible).
/run/systemd/timesync/synchronized
A file that is touched on each successful synchronization, to
assist systemd-time-wait-sync and other applications to detecting
synchronization events.
systemd(1), timesyncd.conf(5), systemd.network(5),
systemd-networkd.service(8), systemd-time-wait-sync.service(8),
timedatectl(1), localtime(5), hwclock(8)
This page is part of the systemd (systemd system and service manager)
project. Information about the project can be found at
⟨http://www.freedesktop.org/wiki/Software/systemd⟩. If you have a bug
report for this manual page, see
⟨http://www.freedesktop.org/wiki/Software/systemd/#bugreports⟩. This
page was obtained from the project's upstream Git repository
⟨https://github.com/systemd/systemd.git⟩ on 2020-08-13. (At that
time, the date of the most recent commit that was found in the repos‐
itory was 2020-08-11.) If you discover any rendering problems in
this HTML version of the page, or you believe there is a better or
more up-to-date source for the page, or you have corrections or
improvements to the information in this COLOPHON (which is not part
of the original manual page), send a mail to man-pages@man7.org
systemd 246 SYSTEMD-TIMESYNCD.SERVICE(8)
Pages that refer to this page: timedatectl(1) , systemd.network(5) , timesyncd.conf(5) , timesyncd.conf.d(5) , 30-systemd-environment-d-generator(7) , systemd.directives(7) , systemd.index(7) , systemd-time-wait-sync(8) , systemd-time-wait-sync.service(8)