Bob MacCallum wrote:
Thanks for all the ideas on this.
re: userfiles/db sync, would this work..?
backup:
1. mysqldump to date-stamp-named files
2. rsync -arv /data/base2/files/ /backup/base2/files
(note, no --delete option on purpose)
restore:
1. undump whichever mysqldump is needed
2. copy over all files that are older than the mysqldump
There is nothing in BASE that guarantees that the name of a deleted file
is not reused by another file later on. However, it is very unlikely
that this should happen with the current implementation. I think you
need to upload a file, delete it, upload another within the same second
AND the system must choose the same random filename for both files. Even
if this happens it would only matter if you started a mysqldump after
the upload of the first file, but before the deletion of it.
For all practical reasons, I think you can assume that files will always
have unique pathnames, and if rsync is just adding new files to the
backup directory you should be able to restore the file system to any
point in time.
The one problem I see is that the restore can bring back files that had been
deleted in BASE. I doubt these would interfere with the running of BASE
however. A small program could be written to delete any files that are not
known about by the db (unless there is already something to do this).
No there is no such program.
Alternatively, one can add the --delete option to rsync and live with only
being able to restore the latest dump (which is OK for us for now).
/Nicklas
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