1 What's new in Samba 4 alpha3
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 alpha3 follows on from our second alpha release (made in
14 December), the first alpha release (made in September), and the
15 Technology Preview series we have offered for some time now.
20 Samba4 alpha3 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 Alpha2 was released in December 2007, Samba has
71 continued to evolve, but you may particularly notice these areas:
73 Python Bindings: Bindings for Python are now in place, and used for
74 Samba's provision script, slowly displacing EJS as the embedded
75 scripting language. With its increased use, Python is no longer
76 optional, and configure will generate an error if it cannot locate
77 an appropriate Python installation.
79 SWAT Disabled: Due to a lack of developer time and without a
80 long-term web developer to maintain it, the SWAT web UI has been
83 Oplock support: Samba4's file server now supports oplocks
85 GNU Make: To try and simplfy our build system, we rely on GNU Make
86 to avoid autogenerating a massive single makefile.
88 Account Expiry: Samba4 now better handles installations over 30 days
89 old (thanks to our long-suffering testers for keeping installations
92 Registry: Samba4 registry interoperability has been improved in
93 both the client utilities and in the registry service exposed by
94 the Samba4 server itself.
96 Administrative Tools: Many enhancements have been made that allow
97 better integration with Windows administrative tools, especially
98 Active Directory Users and Computers.
100 ID mapping: Samba4 now handles ID mapping via winbind. The mappings
101 are stored in a central ldb that could be shared across multiple
102 machines using LDAP. Internal callers access this interface via a new
105 These are just some of the highlights of the work done in the past few
106 months. More details can be found in our GIT history.
112 Those familiar with Samba 3 can find a list of user-visible changes
113 since that release series in the NEWS file.
118 - Domain member support is in it's infancy, and is not comparable to
119 the support found in Samba3.
121 - There is no printing support in the current release.
123 - The Samba4 port of the CTDB clustering support is not yet complete
125 - Clock Synchronisation is critical. Many 'wrong password' errors are
126 actually due to Kerberos objecting to a clock skew between client
133 A short guide to setting up Samba 4 can be found in the howto.txt file
134 in root of the tarball.
136 DEVELOPMENT and FEEDBACK
137 ========================
138 Bugs can be filed at https://bugzilla.samba.org/ but please be aware
139 that many features are simply not expected to work at this stage.
141 The Samba Wiki at http://wiki.samba.org should detail some of these
144 Development and general discussion about Samba 4 happens mainly on
145 the #samba-technical IRC channel (on irc.freenode.net) and
146 the samba-technical mailing list (see http://lists.samba.org/ for