1 What's new in Samba 4 alpha10
2 ============================
4 Samba 4 is the ambitious next version of the Samba suite that is being
5 developed in parallel to the stable 3.x series. The main emphasis in
6 this branch is support for the Active Directory logon protocols used
7 by Windows 2000 and above.
9 Samba4 alpha10 follows on from the alpha release series we have been
10 publishing since September 2007
15 Samba4 alpha10 is not a final Samba release. That is more a reference
16 to Samba4's lack of the features we expect you will need than a
17 statement of code quality, but clearly it hasn't seen a broad
18 deployment yet. If you were to upgrade Samba3 (or indeed Windows) to
19 Samba4, you would find many things work, but that other key features
20 you may have relied on simply are not there yet.
22 For example, while Samba 3 is an excellent member of a Active
23 Directory domain, Samba4 is happier as a domain controller, and it is
24 in this role where it has seen deployment into production.
26 Samba4 is subjected to an awesome battery of tests on an
27 automated basis, we have found Samba4 to be very stable in it's
28 behaviour. We have to recommend against upgrading production servers
29 from Samba 3 to Samba 4 at this stage, because there may be the features on
30 which you may rely that are not present, or the mapping of
31 your configuration and user database may not be complete.
33 If you are upgrading, or looking to develop, test or deploy Samba4, you should
34 backup all configuration and data.
39 Samba4 supports the server-side of the Active Directory logon environment
40 used by Windows 2000 and later, so we can do full domain join
41 and domain logon operations with these clients.
43 Our Domain Controller (DC) implementation includes our own built-in
44 LDAP server and Kerberos Key Distribution Center (KDC) as well as the
45 Samba3-like logon services provided over CIFS. We correctly generate
46 the infamous Kerberos PAC, and include it with the Kerberos tickets we
49 The new VFS features in Samba 4 adapts the filesystem on the server to
50 match the Windows client semantics, allowing Samba 4 to better match
51 windows behaviour and application expectations. This includes file
52 annotation information (in streams) and NT ACLs in particular. The
53 VFS is backed with an extensive automated test suite.
55 A new scripting interface has been added to Samba 4, allowing
56 Python programs to interface to Samba's internals.
58 The Samba 4 architecture is based around an LDAP-like database that
59 can use a range of modular backends. One of the backends supports
60 standards compliant LDAP servers (including OpenLDAP), and we are
61 working on modules to map between AD-like behaviours and this backend.
62 We are aiming for Samba 4 to be powerful frontend to large
68 Alpha9 was released last week, but in the time since the release we
69 have found and fixed an important segfault, and improved the
70 experimental DRS replication.
75 Those familiar with Samba 3 can find a list of user-visible changes
76 since that release series in the NEWS file.
81 - Domain member support is in it's infancy, and is not comparable to
82 the support found in Samba3.
84 - There is no printing support in the current release.
86 - There is no NetBIOS browsing support in the current release
88 - The Samba4 port of the CTDB clustering support is not yet complete
90 - Clock Synchronisation is critical. Many 'wrong password' errors are
91 actually due to Kerberos objecting to a clock skew between client
92 and server. (The NTP work in the previous alphas are partly to assist
95 - The DRS replication code often fails, and is very new
97 - Users upgrading existing databases to Samba4 should carefully
98 consult upgrading-samba4.txt. We have made a number of changes in
99 this release that should make it easier to upgrade in future.
100 Btw: there exists also a script under the "setup" directory of the
101 source distribution called "upgrade_from_s3" which should allow a step-up
102 from Samba3 to Samba4. It's not included yet in the binary distributions
103 since it's completely experimental!
105 - ACL are not set by default on shares created by the provision.
106 Work is underway on this subject and it should be fixed in Alpha10.
111 A short guide to setting up Samba 4 can be found in the howto.txt file
112 in root of the tarball.
114 DEVELOPMENT and FEEDBACK
115 ========================
117 Bugs can be filed at https://bugzilla.samba.org/ but please be aware
118 that many features are simply not expected to work at this stage.
120 The Samba Wiki at http://wiki.samba.org should detail some of these
123 Development and general discussion about Samba 4 happens mainly on
124 the #samba-technical IRC channel (on irc.freenode.net) and
125 the samba-technical mailing list (see http://lists.samba.org/ for