systemd-time-wait-sync.service, systemd-time-wait-sync - Wait until kernel time is synchronized
systemd-time-wait-sync is a system service that delays the start of units that are ordered after time-sync.target (see systemd.special(7) for details) until the system time has been synchronized with an accurate remote reference time source by systemd-timesyncd.service. systemd-timesyncd.service notifies systemd-time-wait-sync about successful synchronization. systemd-time-wait-sync also tries to detect when the kernel marks the system clock as synchronized, but this detection is not reliable and is intended only as a fallback for compatibility with alternative NTP services that can be used to synchronize time (e.g., ntpd, chronyd).
/run/systemd/timesync/synchronized The presence of this file indicates to this service that the system clock has been synchronized.
systemd(1), systemd.special(7), systemd-timesyncd.service(8),
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Pages that refer to this page: systemd.directives(7), systemd.index(7), systemd.special(7), systemd-timesyncd.service(8)