systemd systemd-time-wait-sync.service 8 systemd-time-wait-sync.service systemd-time-wait-sync Wait until kernel time is synchronized systemd-time-wait-sync.service /usr/lib/systemd/systemd-time-wait-sync systemd-time-wait-sync is a system service that delays the start of units that are ordered after time-sync.target (see systemd.special7 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. systemd1 systemd.special7 systemd-timesyncd.service8