systemd: Add "After" dependency on time-sync.target #12248
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Adds 'After=time-sync.target' to the service unit files; this will not have any immediate effect, unless the system administrator has also enabled a unit which has a 'Before' dependency on that target; there are none of those units enabled in a default configuration in common distributions. systemd itself adds such an 'After' dependency to all timer units with OnCalendar settings, and to some other units. However, in a system which makes use of systemd-timesyncd, the admin can enable systemd-time-wait-sync.service, which has such a dependency. The result would be that none of the PowerDNS services on the system would be started until after systemd-timesyncd is certain that the system's clock is synchronized with the configured external source. A similar configuration can be achieved on systems which use ntpd, chronyd, or other time synchronization tools. Closes PowerDNS#11153.
omoerbeek
approved these changes
Dec 7, 2022
rgacogne
approved these changes
Dec 7, 2022
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Short description
Adds 'After=time-sync.target' to the service unit files; this will not have any immediate effect, unless the system administrator has also enabled a unit which has a 'Before' dependency on that target; there are none of those units enabled in a default configuration in common distributions. systemd itself adds such an 'After' dependency to all timer units with OnCalendar settings, and to some other units.
However, in a system which makes use of systemd-timesyncd, the admin can enable systemd-time-wait-sync.service, which has such a dependency. The result would be that none of the PowerDNS services on the system would be started until after systemd-timesyncd is certain that the system's clock is synchronized with the configured external source.
A similar configuration can be achieved on systems which use ntpd, chronyd, or other time synchronization tools.
Closes #11153.
Checklist
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