systemd systemd-time-wait-sync.service 8 systemd-time-wait-sync.service systemd-time-wait-sync Wait Until Kernel Time 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 depend on time-sync.target until the system time has been synchronized with an accurate time source by systemd-timesyncd.service. systemd-timesyncd.service notifies on successful synchronization. systemd-time-wait-sync also tries to detect when the kernel marks the time as synchronized, but this detection is not reliable and is intended only as a fallback for other servies 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,