1 What's new in Samba 4 alpha2
2 ============================
4 Samba 4 is the ambitious next version of the Samba suite that is being
5 developed in parallel to the stable 3.0 series. The main emphasis in
6 this branch is support for the Active Directory logon protocols used
7 by Windows 2000 and above.
9 Samba 4 is currently not yet in a state where it is usable in
10 production environments. Note the WARNINGS below, and the STATUS file,
11 which aims to document what should and should not work.
13 Samba4 alpha2 follows on from our first alpha release, made in
14 September, and the Technology Preview series we have offered for some
20 Samba4 alpha2 is not a final Samba release. That is more a reference
21 to Samba4's lack of the features we expect you will need than a
22 statement of code quality, but clearly it hasn't seen a broad
23 deployment yet. If you were to upgrade Samba3 (or indeed Windows) to
24 Samba4, you would find many things work, but that other key features
25 you may have relied on simply are not there yet.
27 For example, while Samba 3.0 is an excellent member of a Active
28 Directory domain, Samba4 is happier as a domain controller: (This is
29 where we have done most of the research and development).
31 While Samba4 is subjected to an awesome battery of tests on an
32 automated basis, and we have found Samba4 to be very stable in it's
33 behaviour, we have to recommend against upgrading production servers
34 from Samba 3 to Samba 4 at this stage. If you are upgrading an
35 experimental server, or looking to develop and test Samba, you should
36 backup all configuration and data.
41 Samba4 supports the server-side of the Active Directory logon environment
42 used by Windows 2000 and later, so we can do full domain join
43 and domain logon operations with these clients.
45 Our Domain Controller (DC) implementation includes our own built-in
46 LDAP server and Kerberos Key Distribution Center (KDC) as well as the
47 Samba3-like logon services provided over CIFS. We correctly generate
48 the infamous Kerberos PAC, and include it with the Kerberos tickets we
51 The new VFS features in Samba 4 adapts the filesystem on the server to
52 match the Windows client semantics, allowing Samba 4 to better match
53 windows behaviour and application expectations. This includes file
54 annotation information (in streams) and NT ACLs in particular. The
55 VFS is backed with an extensive automated test suite.
57 A new scripting interface has been added to Samba 4, allowing
58 Python programs to interface to Samba's internals.
60 The Samba 4 architecture is based around an LDAP-like database that
61 can use a range of modular backends. One of the backends supports
62 standards compliant LDAP servers (including OpenLDAP), and we are
63 working on modules to map between AD-like behaviours and this backend.
64 We are aiming for Samba 4 to be powerful frontend to large
70 In the time since Samba4 Alpha1 was released in September 2007, Samba has
71 continued to evolve, but you may particularly notice these areas:
73 MMC Support: The Active Directory Users and Computers console now
74 handles group membership correctly.
76 member/memberOf: These and other linked attributes are now kept in
79 subtree renames: Renaming a subtree of LDAP objects is now possible,
80 with all linked attributes being kept consistant.
82 Python Bindings: Bindings for a future move to Python as the
83 internal scripting language have been created.
85 Shared library use: In support of projects such as OpenChange,
86 which depend on Samba4, more of Samba4 is built as shared libraries.
88 These are just some of the highlights of the work done in the past few
89 months. More details can be found in our SVN history.
95 Those familiar with Samba 3 can find a list of user-visible changes
96 since that release series in the NEWS file.
101 - Domain member support is in it's infancy, and is not comparable to
102 the support found in Samba3.
104 - There is no printing support in the current release.
106 - The Samba4 port of the CTDB clustering support is not yet complete
108 - Clock Synchronisation is critical. Many 'wrong password' errors are
109 actually due to Kerberos objecting to a clock skew between client
115 A short guide to setting up Samba 4 can be found in the howto.txt file
116 in root of the tarball.
118 DEVELOPMENT and FEEDBACK
119 ========================
120 Bugs can be filed at https://bugzilla.samba.org/ but please be aware
121 that many features are simply not expected to work at this stage.
123 The Samba Wiki at http://wiki.samba.org should detail some of these
126 Development and general discussion about Samba 4 happens mainly on
127 the #samba-technical IRC channel (on irc.freenode.net) and
128 the samba-technical mailing list (see http://lists.samba.org/ for