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It is a service available under GNU/Linux. Originally build for sharing files with windows using a smb-compatible protocol.

The version 4 implements a lot of new fetaures :

• support of the 'Active Directory' logon and administration protocols
• new 'full coverage' testsuites
• full NTFS semantics for sharing backends
• Internal LDAP server, with AD semantics
• Internal Kerberos server, including PAC support
• Bind9 integration for AD DNS support
• fully asynchronous internals
• flexible process models
• better scalablilty from micro to very large installations
• new RPC infrastructure (PIDL)
• flexible database architecture (LDB)
• Python support - used excessively for client and management tools
• generic security subsystem (GENSEC)
• over 50% auto-generated code!

So if you want to have an Active Directory like server but completly free and under Ubuntu ; there's a way to install it very easily way to install the daily-build version. If you wanna do less update of samba; you would use the version provided by ubuntu.

For those who want to use the Ubuntu version, pass directly to the point 3.

Add two repositories

$ apt-add-repository ppa:samba-team/ppa
$ apt-add-repository ppa:openchange/daily

if you don't have the command apt-add-repo ; install it :

sudo apt-get install python-software-properties

Set the packages from ppa repositories prioritirly

You need to create the file /etc/apt/preferences.d/ppa with the following content :

Package: *
Pin: origin ppa.launchpad.net
Pin-Priority: 600

Install the right pakages

aptitude update && aptitude install samba4 openchangeserver samba4-ldb libwbclient0

If you get an error during the process ; you may need to create a link : # ln -s /usr/lib/libwbclient.so.0 /usr/lib/libwbclient.so then run "dpkg --configure -a"

To configure and install your domain

Check your hosts file to match with the hostname. Remove the configuration file " /etc/samba/smb.conf" Adapt the following command line to your case.

bash /usr/share/samba/setup/provision --realm=pdc.mydomain --domain=MYDOMAIN --adminpass=password --server-role='domain controller'

add /var/lib/samba/private/named.conf to /etc/bind/named.conf

If you get an error after an upgrade; search on the web or wait for a new version ; it's still an alpha version. Sources :

• http://wiki.samba.org/index.php/Samba4/HOWTO
• http://jelmer.vernstok.nl/blog/archives/263-Samba-4-and-OpenChange-daily-Ubuntu-packages.html