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

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

SYSTEMD-TIMESYNCD.SERVICE(8)stemd-timesyncd.serviceTEMD-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 2020-09-18.  (At that
       time, the date of the most recent commit that was found in the repos‐
       itory was 2020-09-18.)  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 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)