systemd-timesyncd.service(8) — Linux manual page

NAME | SYNOPSIS | DESCRIPTION | FILES | SEE ALSO | COLOPHON

SYSTEMD-TIMESYNCD.SERVICE(8)emd-timesyncd.serviceMD-TIMESYNCD.SERVICE(8)

NAME         top

       systemd-timesyncd.service, systemd-timesyncd - Network Time
       Synchronization

SYNOPSIS         top

       systemd-timesyncd.service

       /usr/lib/systemd/systemd-timesyncd

DESCRIPTION         top

       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.

FILES         top

       /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.

SEE ALSO         top

       systemd(1), timesyncd.conf(5), systemd.network(5),
       systemd-networkd.service(8), systemd-time-wait-sync.service(8),
       timedatectl(1), localtime(5), hwclock(8)

COLOPHON         top

       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)