[ANNOUNCE] Samba 4.0.0alpha11

Andrew Bartlett abartlet at samba.org
Sun Jan 10 23:34:00 MST 2010

We are proud to a announce another alpha release of Samba 4. 

What's new in Samba 4 alpha11

Samba 4 is the ambitious next version of the Samba suite that is being
developed in parallel to the stable 3.x series. The main emphasis in
this branch is support for the Active Directory logon protocols used
by Windows 2000 and above.

Samba4 alpha11 follows on from the alpha release series we have been
publishing since September 2007


Samba4 alpha11 is not a final Samba release.  That is more a reference
to Samba4's lack of the features we expect you will need than a
statement of code quality, but clearly it hasn't seen a broad
deployment yet.  If you were to upgrade Samba3 (or indeed Windows) to
Samba4, you would find many things work, but that other key features
you may have relied on simply are not there yet.

For example, while Samba 3 is an excellent member of a Active
Directory domain, Samba4 is happier as a domain controller, and it is
in this role where it has seen deployment into production.

Samba4 is subjected to an awesome battery of tests on an
automated basis, we have found Samba4 to be very stable in it's
behaviour.  We have to recommend against upgrading production servers
from Samba 3 to Samba 4 at this stage, because there may be the features on
which you may rely that are not present, or the mapping of
your configuration and user database may not be complete. 

If you are upgrading, or looking to develop, test or deploy Samba4, you should
backup all configuration and data.


Samba4 supports the server-side of the Active Directory logon environment
used by Windows 2000 and later, so we can do full domain join
and domain logon operations with these clients.

Our Domain Controller (DC) implementation includes our own built-in
LDAP server and Kerberos Key Distribution Center (KDC) as well as the
Samba3-like logon services provided over CIFS.  We correctly generate
the infamous Kerberos PAC, and include it with the Kerberos tickets we

The new VFS features in Samba 4 adapts the filesystem on the server to
match the Windows client semantics, allowing Samba 4 to better match
windows behaviour and application expectations.  This includes file
annotation information (in streams) and NT ACLs in particular.  The
VFS is backed with an extensive automated test suite.

A new scripting interface has been added to Samba 4, allowing
Python programs to interface to Samba's internals.

The Samba 4 architecture is based around an LDAP-like database that
can use a range of modular backends.  One of the backends supports
standards compliant LDAP servers (including OpenLDAP), and we are
working on modules to map between AD-like behaviours and this backend.
We are aiming for Samba 4 to be powerful frontend to large


Since the alpha10 release, we have fixed a number of serious bugs in
the implementation of AD-compatible 'Directory Replication Services'.
We can now join an AD domain as a read-write DC

Importantly, since alpha10, the following serious issues were
 - We now allocate RID values safely (previous implementations would
 add users and groups without regard to allocated RID pools, possibly
 creating duplicates)
 - In previous Samba4 versions, a failure to 'prepare' a transaction
 would silently commit the transaction. 

Any deployments of Samba4 before this alpha are very strongly
encouraged to upgrade.  Assistance may be found in the
upgradeprovision script, and the advice of the Samba Team should be
sought to determine the impact of these issues in your particular

Our progress on DRS is being tracked in the Samba wiki:


Those familiar with Samba 3 can find a list of user-visible changes
since that release series in the NEWS file.


- Domain member support is in it's infancy, and is not comparable to
  the support found in Samba3.

- There is no printing support in the current release.

- There is no NetBIOS browsing support in the current release

- The Samba4 port of the CTDB clustering support is not yet complete

- Clock Synchronisation is critical.  Many 'wrong password' errors are
  actually due to Kerberos objecting to a clock skew between client
  and server.  (The NTP work in the previous alphas are partly to assist
  with this problem).

- The DRS replication code often fails, and is very new

- Users upgrading existing databases to Samba4 should carefully
  consult upgrading-samba4.txt.  We have made a number of changes in
  this release that should make it easier to upgrade in future.
  Btw: there exists also a script under the "setup" directory of the
  source distribution called "upgrade_from_s3" which should allow a step-up
  from Samba3 to Samba4. It's not included yet in the binary distributions
  since it's completely experimental!

- ACL are not set by default on shares created by the provision.
  Work is underway on this subject and it should be fixed in Alpha12.


A short guide to setting up Samba 4 can be found in the howto.txt file
in root of the tarball.


Bugs can be filed at https://bugzilla.samba.org/ but please be aware
that many features are simply not expected to work at this stage.  

The Samba Wiki at http://wiki.samba.org should detail some of these
development plans.

Development and general discussion about Samba 4 happens mainly on
the #samba-technical IRC channel (on irc.freenode.net) and
the samba-technical mailing list (see http://lists.samba.org/ for

Download Details

The release tarball is available from the following location:
 * http://download.samba.org/samba/ftp/samba4/samba-4.0.0alpha11.tar.gz

This release has been signed using GPG with Andrew's GPG key (28B436BB).

 * http://download.samba.org/samba/ftp/samba4/samba-4.0.0alpha11.tar.asc

To verify that the signature is correct, make sure that the tarball has
been unzipped and run:

$ gpg --verify samba-4.0.0alpha10.tar.asc

Happy testing!

The Samba team

Andrew Bartlett                                http://samba.org/~abartlet/
Authentication Developer, Samba Team           http://samba.org
Samba Developer, Cisco Inc.

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