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SYSTEMD-TIMESYNCD.SERVICE(8)emd-timesyncd.serviceMD-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 2020-12-18. (At that
time, the date of the most recent commit that was found in the
repository was 2020-12-18.) 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 247 SYSTEMD-TIMESYNCD.SERVICE(8)
Pages that refer to this page: timedatectl(1), systemd.network(5), timesyncd.conf(5), systemd.directives(7), systemd.index(7), systemd-timedated.service(8), systemd-time-wait-sync.service(8)
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