Date: Thu, 10 Jan 2013 11:09:19 -0800 From: Chuck Swiger <cswiger@mac.com> To: tundra@tundraware.com Cc: FreeBSD Mailing List <freebsd-questions@freebsd.org> Subject: Re: Syncing Two Dirs With Rsync Message-ID: <67BEF7CB-1FC4-43EB-AFF8-8ECD3A68B214@mac.com> In-Reply-To: <50EF0F1F.8080904@tundraware.com> References: <50EF0F1F.8080904@tundraware.com>
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On Jan 10, 2013, at 10:57 AM, Tim Daneliuk wrote: > I have used rsync for many years to make sure a destination > machine:directory is kept up-to-date with some source master > directory. > > I now need to find a way to keep two different machine:dirs > in sync with each other. But for any given file, I don't know > which of these is newer so I don't know "which way" to sync. > > For example given: > > machineA::/dir/foo machineB:/dir/foo > machineA::/dir/bar machineB:/dir/bar > > Say the machineA has the newest foo, but machineB has the > newest bar. At the end of syncing, I want both machines > to have the latest copies of everything. > > I'm guessing there's a way to do this with rsync but I'm kind > of stumped. rsync's --update flag will not overwrite a file at the destination if it was modified more recently then the source location. So you can run rsync twice to sync from A to B and then from B to A. Make very sure both boxes are keeping correct time and/or are mutually sync'ed via NTP or similar. However, if you make different changes to the same file on A and on B, you will lose one of them. (That is what version control systems like SVN and git would resolve. So if you do plan to do 2-way or N-way changes and sync'ing on a regular basis, version control is much less likely to lose changes or otherwise screw up.) Regards, -- -Chuck
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