NAME

       idmap_tdb2 - Samba's idmap_tdb2 Backend for Winbind

DESCRIPTION

       The idmap_tdb2 plugin is a substitute for the default idmap_tdb backend used by winbindd
       for storing SID/uid/gid mapping tables in clustered environments with Samba and CTDB.

       In contrast to read only backends like idmap_rid, it is an allocating backend: This means
       that it needs to allocate new user and group IDs in order to create new mappings.

IDMAP OPTIONS

       range = low - high
           Defines the available matching uid and gid range for which the backend is
           authoritative.

       script
           This option can be used to configure an external program for performing id mappings
           instead of using the tdb counter. The mappings are then stored int tdb2 idmap
           database. For details see the section on IDMAP SCRIPT below.

IDMAP SCRIPT

       The tdb2 idmap backend supports an external program for performing id mappings through the
       smb.conf option idmap config * : script or its deprecated legacy form idmap : script.

       The mappings obtained by the script are then stored in the idmap tdb2 database instead of
       mappings created by the incrementing id counters. It is therefore important that the
       script covers the complete range of SIDs that can be passed in for SID to Unix ID mapping,
       since otherwise SIDs unmapped by the script might get mapped to IDs that had previously
       been mapped by the script.

       The script should accept the following command line options.

                SIDTOID S-1-xxxx
                IDTOSID UID xxxx
                IDTOSID GID xxxx

       And it should return one of the following responses as a single line of text.

                UID:yyyy
                GID:yyyy
                SID:yyyy
                ERR:yyyy

EXAMPLES

       This example shows how tdb2 is used as the default idmap backend.

                [global]
                idmap config * : backend = tdb2
                idmap config * : range = 1000000-2000000

       This example shows how tdb2 is used as the default idmap backend using an external program
       via the script parameter:

                [global]
                idmap config * : backend = tdb2
                idmap config * : range = 1000000-2000000
                idmap config * : script = /usr/local/samba/bin/idmap_script.sh

AUTHOR

       The original Samba software and related utilities were created by Andrew Tridgell. Samba
       is now developed by the Samba Team as an Open Source project similar to the way the Linux
       kernel is developed.