1 <?xml version="1.0" encoding="iso-8859-1"?>
2 <!DOCTYPE refentry PUBLIC "-//Samba-Team//DTD DocBook V4.2-Based Variant V1.0//EN" "http://www.samba.org/samba/DTD/samba-doc">
3 <refentry id="idmap_tdb.8">
6 <refentrytitle>idmap_tdb</refentrytitle>
7 <manvolnum>8</manvolnum>
8 <refmiscinfo class="source">Samba</refmiscinfo>
9 <refmiscinfo class="manual">System Administration tools</refmiscinfo>
10 <refmiscinfo class="version">3.2</refmiscinfo>
15 <refname>idmap_tdb</refname>
16 <refpurpose>Samba's idmap_tdb Backend for Winbind</refpurpose>
20 <title>DESCRIPTION</title>
23 The idmap_tdb plugin is the default backend used by winbindd
24 for storing SID/uid/gid mapping tables. In contrast to read only
25 backends like idmap_rid, it is an allocating backend:
26 This means that it needs to allocate new user and group IDs
27 to create new mappings as requests to yet unmapped users are answered.
31 Note that in order for this (or any other allocating) backend to
32 function at all, the default backend needs to be writeable.
33 The ranges used for uid and gid allocation are the default ranges
34 configured by "idmap uid" and "idmap gid".
38 Furthermore, since there is only one global allocating backend
39 responsible for all domains using writeable idmap backends,
40 any explicitly configured domain with idmap backend tdb
41 should have the same range as the default range, since it needs
42 to use the global uid / gid allocator. See the example below.
47 <title>IDMAP OPTIONS</title>
51 <term>range = low - high</term>
53 Defines the available matching uid and gid range for which the
54 backend is authoritative.
55 If the parameter is absent, Winbind fails over to use
56 the "idmap uid" and "idmap gid" options
64 <title>EXAMPLES</title>
67 This example shows how tdb is used as a the default idmap backend.
68 It configures the idmap range through the global options for all
69 domains encountered. This same range is used for uid/gid allocation.
74 # "idmap backend = tdb" is redundant here since it is the default
76 idmap uid = 1000000-2000000
77 idmap gid = 1000000-2000000
81 This (rather theoretical) example shows how tdb can be used as the
82 allocating backend while ldap is the default backend used to store
84 It adds an explicit configuration for some domain DOM1, that
85 uses the tdb idmap backend. Note that the same range as the
86 default uid/gid range is used, since the allocator has to serve
87 both the default backend and the explicitly configured domain DOM1.
93 idmap uid = 1000000-2000000
94 idmap gid = 1000000-2000000
95 # use a different uid/gid allocator:
96 idmap alloc backend = tdb
98 idmap config DOM1 : backend = tdb
99 idmap config DOM1 : range = 1000000-2000000
104 <title>AUTHOR</title>
107 The original Samba software and related utilities
108 were created by Andrew Tridgell. Samba is now developed
109 by the Samba Team as an Open Source project similar
110 to the way the Linux kernel is developed.