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Samba HowTo Guide
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Managing IDMAP UID/SID Mappings

The IDMAP UID to SID, and SID to UID, mappings that are created by winbindd can be backed up to a text file. The text file can be manually edited, although it is highly recommended that you attempt this only if you know precisely what you are doing.

An IDMAP text dump file can be restored (or reloaded). There are two situations that may necessitate this action: a) The existing IDMAP file is corrupt, b) It is necessary to install an editted version of the mapping information.

Winbind must be shut down to dump the IDMAP file. Before restoring a dump file, shut down winbindd and delete the old winbindd_idmap.tdb file.

Samba HowTo Guide
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