systemd Developer Peter Bigot pab@pabigot.com 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 systemd-timesyncd.service or something else has set the system time and marked it as synchronized. Reaching this state generally requires synchronization with an external source, such as an NTP server. When this unit is not enabled the time-sync.target synchronization point may be reached as soon as the system time is advanced by systemd-timesyncd.service to the time stored at the last shutdown. That time may not meet the expectations of dependent services that require an accurate clock. This service works correctly with a time synchronization service like systemd-timesyncd.service that uses the same protocol as NTP to set the time from a synchronized source. When used with time synchronization services that follow a different protocol the event of setting synchronized time may not be detected in which case this service will not complete. systemd1, systemd.special7, systemd-timesyncd.service8,