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I care only about the same file stored in two different machines. I would like to keep changes in sync and as fast as possible. Would rsync as a daemon be up to it? Or is there something else I can use.

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Unidirectional or bidirectional sync? –  cdhowie Mar 22 '13 at 21:20
    
@cdhowie: bi-directional. I would rather not have one side pushing and polling changes due to speed considerations. –  Micy Bart Mar 22 '13 at 21:22
    
@MicyBart I mean will the file only ever change on one side, or do both sides need to sync changes to the opposite server? (Is one side a read-only copy?) –  cdhowie Mar 22 '13 at 21:22
    
@cdhowie: Ahh. The file will change on both sides. –  Micy Bart Mar 22 '13 at 21:23
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@MicyBart: what if files were changed on both sides at exact same time (to nanosecond)? In general, this problem does NOT have simple solution. –  mvp Mar 23 '13 at 5:33

1 Answer 1

You can use unison (http://www.cis.upenn.edu/~bcpierce/unison/) with the --batch option. This will make a bidirectional sync over ssh or ftp.

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