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A.7.2.13 zonefile-sync

zonefile-sync is only relevant in a slave server scenario and only after receiving IXFR. It is a time in seconds after which current zone in memory will be synced to its file on a disk (as set in file). Knot DNS will serve the latest zone even after restart, but zone file on a disk will only be synced after zonefile-sync time has expired. Possible values are 1 to INT_MAX, optionally suffixed by unit size (s/m/h/d) - 1s is one second, 1m one minute, 1h one hour and 1d one day with default value set to 1h.