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_tdb2.8">
6
<refentrytitle>idmap_tdb2</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_tdb2</refname>
16
<refpurpose>Samba's idmap_tdb2 Backend for Winbind</refpurpose>
20
<title>DESCRIPTION</title>
23
The idmap_tdb2 plugin is a substitute for the default idmap_tdb
24
backend used by winbindd for storing SID/uid/gid mapping tables
25
in clustered environments with Samba and CTDB.
29
In contrast to read only backends like idmap_rid, it is an allocating
30
backend: This means that it needs to allocate new user and group IDs in
31
order to create new mappings. The allocator can be provided by the
32
idmap_tdb2 backend itself or by any other allocating backend like
33
idmap_tdb or idmap_ldap. This is configured with the
34
parameter <parameter>idmap alloc backend</parameter>.
38
Note that in order for this (or any other allocating) backend to
39
function at all, the default backend needs to be writeable.
40
The ranges used for uid and gid allocation are the default ranges
41
configured by "idmap uid" and "idmap gid".
45
Furthermore, since there is only one global allocating backend
46
responsible for all domains using writeable idmap backends,
47
any explicitly configured domain with idmap backend tdb2
48
should have the same range as the default range, since it needs
49
to use the global uid / gid allocator. See the example below.
54
<title>IDMAP OPTIONS</title>
58
<term>range = low - high</term>
60
Defines the available matching uid and gid range for which the
61
backend is authoritative.
62
If the parameter is absent, Winbind fails over to use
63
the "idmap uid" and "idmap gid" options
71
<title>IDMAP SCRIPT</title>
74
The tdb2 idmap backend supports a script for performing id mappings
75
through the smb.conf option <parameter>idmap : script</parameter>.
76
The script should accept the following command line options.
86
And it should return one of the following responses as a single line of
98
Note that the script should cover the complete range of SIDs
99
that can be passed in for SID to Unix ID mapping, since otherwise
100
SIDs unmapped by the script might get mapped to IDs that had
101
previously been mapped by the script.
106
<title>EXAMPLES</title>
109
This example shows how tdb2 is used as a the default idmap backend.
110
It configures the idmap range through the global options for all
111
domains encountered. This same range is used for uid/gid allocation.
117
idmap uid = 1000000-2000000
118
idmap gid = 1000000-2000000
123
<title>AUTHOR</title>
126
The original Samba software and related utilities
127
were created by Andrew Tridgell. Samba is now developed
128
by the Samba Team as an Open Source project similar
129
to the way the Linux kernel is developed.