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">3.4</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.
28 In contrast to read only backends like idmap_rid, it is an allocating
29 backend: This means that it needs to allocate new user and group IDs in
30 order to create new mappings. The allocator can be provided by the
31 idmap_tdb backend itself or by any other allocating backend like
32 idmap_ldap or idmap_tdb2. This is configured with the
33 parameter <parameter>idmap alloc backend</parameter>.
37 Note that in order for this (or any other allocating) backend to
38 function at all, the default backend needs to be writeable.
39 The ranges used for uid and gid allocation are the default ranges
40 configured by "idmap uid" and "idmap gid".
44 Furthermore, since there is only one global allocating backend
45 responsible for all domains using writeable idmap backends,
46 any explicitly configured domain with idmap backend tdb
47 should have the same range as the default range, since it needs
48 to use the global uid / gid allocator. See the example below.
53 <title>IDMAP OPTIONS</title>
57 <term>range = low - high</term>
59 Defines the available matching uid and gid range for which the
60 backend is authoritative.
61 If the parameter is absent, Winbind fails over to use
62 the "idmap uid" and "idmap gid" options
70 <title>EXAMPLES</title>
73 This example shows how tdb is used as a the default idmap backend.
74 It configures the idmap range through the global options for all
75 domains encountered. This same range is used for uid/gid allocation.
80 # "idmap backend = tdb" is redundant here since it is the default
82 idmap uid = 1000000-2000000
83 idmap gid = 1000000-2000000
87 This (rather theoretical) example shows how tdb can be used as the
88 allocating backend while ldap is the default backend used to store
90 It adds an explicit configuration for some domain DOM1, that
91 uses the tdb idmap backend. Note that the same range as the
92 default uid/gid range is used, since the allocator has to serve
93 both the default backend and the explicitly configured domain DOM1.
99 idmap uid = 1000000-2000000
100 idmap gid = 1000000-2000000
101 # use a different uid/gid allocator:
102 idmap alloc backend = tdb
104 idmap config DOM1 : backend = tdb
105 idmap config DOM1 : range = 1000000-2000000
110 <title>AUTHOR</title>
113 The original Samba software and related utilities
114 were created by Andrew Tridgell. Samba is now developed
115 by the Samba Team as an Open Source project similar
116 to the way the Linux kernel is developed.