It really depends on the platform. Windows doesn’t support atomic replacement via rename.
On platforms where atomic replacement via rename is supported it is used. Mark > On 13 Nov 2018, at 6:39 am, Marcus Frenkel <marcus.fren...@gmail.com> wrote: > > Thank you for the quick reply Tony! > > Follow-up questions just to be sure: > 1. The new zone file is renamed in the placed of the old one, only after all > changes to the new file are written? > 2. Is the zone file atomically replaced during the renaming process, in a > sense that there is no window in which the file is empty or non-existent? > > I'm running BIND on Debian 9. Based on this Linux man page, the rename > function should be atomic. I would not imagine that BIND does it in different > way, like the worst case scenario to first remove the current file and then > move the new one to the same path. I know I'm too cautious, I'm just trying > to avoid any chance for rsync to transfer incomplete or empty zone file, or > maybe delete the file at the destination if it does not exist at the source > for a short moment. > > Marcus > > On Mon, Nov 12, 2018 at 7:19 PM Tony Finch <d...@dotat.at> wrote: > Marcus Frenkel <marcus.fren...@gmail.com> wrote: > > > > I need to know how BIND writes to slave zone files after zone has been > > updated. Does it modify the file in place or it replaces the file with > > new one at once? > > Changes are written to a journal append-only style. Every so often the > master file is rewritten to incorporate the contents of the journal; this > is done by writing to a new file and renaming it in place of the old one. > > Tony. > -- > f.anthony.n.finch <d...@dotat.at> http://dotat.at/ > sovereignty rests with the people and authority > in a democracy derives from the people > _______________________________________________ > Please visit https://lists.isc.org/mailman/listinfo/bind-users to unsubscribe > from this list > > bind-users mailing list > bind-users@lists.isc.org > https://lists.isc.org/mailman/listinfo/bind-users -- Mark Andrews, ISC 1 Seymour St., Dundas Valley, NSW 2117, Australia PHONE: +61 2 9871 4742 INTERNET: ma...@isc.org _______________________________________________ Please visit https://lists.isc.org/mailman/listinfo/bind-users to unsubscribe from this list bind-users mailing list bind-users@lists.isc.org https://lists.isc.org/mailman/listinfo/bind-users
