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+<?xml version="1.0" encoding="iso-8859-1"?>
+<!DOCTYPE refentry PUBLIC "-//Samba-Team//DTD DocBook V4.2-Based Variant V1.0//EN" "http://www.samba.org/samba/DTD/samba-doc">
+<refentry id="idmap_tdb2.8">
+
+<refmeta>
+ <refentrytitle>idmap_tdb2</refentrytitle>
+ <manvolnum>8</manvolnum>
+ <refmiscinfo class="source">Samba</refmiscinfo>
+ <refmiscinfo class="manual">System Administration tools</refmiscinfo>
+ <refmiscinfo class="version">3.3</refmiscinfo>
+</refmeta>
+
+
+<refnamediv>
+ <refname>idmap_tdb2</refname>
+ <refpurpose>Samba's idmap_tdb2 Backend for Winbind</refpurpose>
+</refnamediv>
+
+<refsynopsisdiv>
+ <title>DESCRIPTION</title>
+
+ <para>
+ 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.
+ </para>
+
+ <para>
+ 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
+ to create new mappings as requests to yet unmapped users are answered.
+ </para>
+
+ <para>
+ 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 &quot;idmap uid&quot; and &quot;idmap gid&quot;.
+ </para>
+
+ <para>
+ Furthermore, since there is only one global allocating backend
+ responsible for all domains using writeable idmap backends,
+ any explicitly configured domain with idmap backend tdb2
+ should have the same range as the default range, since it needs
+ to use the global uid / gid allocator. See the example below.
+ </para>
+</refsynopsisdiv>
+
+<refsect1>
+ <title>IDMAP OPTIONS</title>
+
+ <variablelist>
+ <varlistentry>
+ <term>range = low - high</term>
+ <listitem><para>
+ 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 &quot;idmap uid&quot; and &quot;idmap gid&quot; options
+ from smb.conf.
+ </para></listitem>
+ </varlistentry>
+ </variablelist>
+</refsect1>
+
+<refsect1>
+ <title>IDMAP SCRIPT</title>
+
+ <para>
+ The tdb2 idmap backend supports a script for performing id mappings
+ through the smb.conf option <parameter>idmap : script</parameter>.
+ The script should accept the following command line options.
+ </para>
+
+ <programlisting>
+ SIDTOID S-1-xxxx
+ IDTOSID UID xxxx
+ IDTOSID GID xxxx
+ </programlisting>
+
+ <para>
+ And it should return one of the following responses as a single line of
+ text.
+ </para>
+
+ <programlisting>
+ UID:yyyy
+ GID:yyyy
+ SID:yyyy
+ ERR:yyyy
+ </programlisting>
+
+ <para>
+ Note that the script should cover 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.
+ </para>
+</refsect1>
+
+<refsect1>
+ <title>EXAMPLES</title>
+
+ <para>
+ This example shows how tdb2 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.
+ </para>
+
+ <programlisting>
+ [global]
+ # "idmap backend = tdb2" is redundant here since it is the default
+ idmap backend = tdb2
+ idmap uid = 1000000-2000000
+ idmap gid = 1000000-2000000
+ </programlisting>
+</refsect1>
+
+<refsect1>
+ <title>AUTHOR</title>
+
+ <para>
+ 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.
+ </para>
+</refsect1>
+
+</refentry>