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       idmap_tdb - Samba's idmap_tdb Backend for Winbind


       The idmap_tdb plugin is the default backend used by winbindd for
       storing SID/uid/gid mapping tables.

       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. The allocator can be provided by the
       idmap_tdb backend itself or by any other allocating backend like
       idmap_ldap or idmap_tdb2. This is configured with the parameter idmap
       alloc backend.

       Note that in order for this (or any other allocating) backend to
       function at all, the default backend needs to be writeable. The ranges
       used for uid and gid allocation are the default ranges configured by
       "idmap uid" and "idmap gid".

       Furthermore, since there is only one global allocating backend
       responsible for all domains using writeable idmap backends, any
       explicitly configured domain with idmap backend tdb should have the
       same range as the default range, since it needs to use the global uid /
       gid allocator. See the example below.


       range = low - high
           Defines the available matching uid and gid range for which the
           backend is authoritative. If the parameter is absent, Winbind fails
           over to use the "idmap uid" and "idmap gid" options from smb.conf.


       This example shows how tdb is used as a the default idmap backend. It
       configures the idmap range through the global options for all domains
       encountered. This same range is used for uid/gid allocation.

                # "idmap backend = tdb" is redundant here since it is the default
                idmap backend = tdb
                idmap uid = 1000000-2000000
                idmap gid = 1000000-2000000

       This (rather theoretical) example shows how tdb can be used as the
       allocating backend while ldap is the default backend used to store the
       mappings. It adds an explicit configuration for some domain DOM1, that
       uses the tdb idmap backend. Note that the same range as the default
       uid/gid range is used, since the allocator has to serve both the
       default backend and the explicitly configured domain DOM1.

                idmap backend = ldap
                idmap uid = 1000000-2000000
                idmap gid = 1000000-2000000
                # use a different uid/gid allocator:
                idmap alloc backend = tdb

                idmap config DOM1 : backend = tdb
                idmap config DOM1 : range = 1000000-2000000


       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.