Working Samba 4 NT4 style PDC on Centos 7 - How to upgrade to AD PDC

Hi !

I have a working configuration of Samba 4.1.1 on Centos 7. Samba is now configured as an old style NT4 PDC and all works very fine. Now I would like do upgrade the Samba configuration to Active Directory DC server. I have then installed, for this purpose, the Centos 7 packages samba-dc and samba-dc-libs:

Name          : samba-dc
Arch             : x86_64
Version        : 4.1.1
Release       : 37.el7_0
Size              : 964
Repo            : installed
From repo   : sl-security
Summary     : Samba AD Domain Controller
URL               : http://www.samba.org/
License         : GPLv3+ and LGPLv3+
Description : The samba-dc package provides AD Domain Controller functionality

Name           : samba-dc-libs
Arch             : x86_64
Version        : 4.1.1
Release        : 37.el7_0
Size               : 964
Repo             : installed
From repo   : sl-security
Summary     : Samba AD Domain Controller Libraries
URL               : http://www.samba.org/
License         : GPLv3+ and LGPLv3+
Description  : The samba4-dc-libs package contains the libraries needed by the DC to
                         link against the SMB, RPC and other protocols.

My smb.conf looks like this:

Server role: ROLE_DOMAIN_PDC
Press enter to see a dump of your service definitions

[global]
        workgroup = LATTARI
        server string = LATTARI - FILEMON1 PDC
        interfaces = lo, enp3s6
        bind interfaces only = Yes
        log file = /var/log/samba/log.%m
        max log size = 50
        load printers = No
        printcap name = /dev/null
        disable spoolss = Yes
        add user script = /usr/sbin/useradd "%u" -n -g users
        delete user script = /usr/sbin/userdel "%u"
        add group script = /usr/sbin/groupadd "%g"
        delete group script = /usr/sbin/groupdel "%g"
        delete user from group script = /usr/sbin/userdel "%u" "%g"
        add machine script = /usr/sbin/useradd -n -c "Workstation (%u)" -M -d /nohome -s /bin/false "%u"
        logon script = %u.bat
        logon path = \\%L\Profiles\%u
        logon drive = H:
        domain logons = Yes
        os level = 64
        preferred master = Yes
        domain master = Yes
        wins support = Yes
        idmap config * : backend = tdb
        invalid users = apache, bin, daemon, adm, sync, shutdown, halt, mail, news, uucp, operator
        admin users = root, @admin
        hosts allow = 127.0.0.1, 192.168.0.0/24
        printing = bsd
        print command = lpr -r -P'%p' %s
        lpq command = lpq -P'%p'
        lprm command = lprm -P'%p' %j

[homes]
        comment = Home Directories
        valid users = %S
        read only = No
        create mask = 0700
        directory mask = 0700
        browseable = No

[printers]
        comment = All Printers
        path = /var/spool/samba
        printable = Yes
        print ok = Yes
        browseable = No

[netlogon]
        comment = Network Logon Service
        path = /var/lib/samba/netlogon

[Profiles]
        path = /home/samba/Profiles
        read only = No
        create mask = 0600
        directory mask = 0700
        profile acls = Yes
        browseable = No


My question is: how to proceed now to configure Samba as AD PDC server using the installed packages?