- Centos: 6.5 64 bit (2.6.32-431.el6.x86_64)
- Samba: Version 4.0.0rc4 

yum install samba4* 

# Global parameters
[global]
workgroup = ldaptest
netbios name = PDC-SRV
security = user
enable privileges = yes
#interfaces = 192.168.5.11
#username map = /etc/samba/smbusers
server string = Samba Server %v
#security = ads
encrypt passwords = Yes
min passwd length = Removed
#pam password change = no
#obey pam restrictions = No

# method 1:
#unix password sync = no
#ldap passwd sync = yes

# method 2:
unix password sync = yes
#ldap passwd sync = no
ldap passwd sync = yes
passwd program = /usr/sbin/smbldap-passwd -u "%u"
passwd chat = "Changing *\nNew password*" %n\n "*Retype new password*" %n\n"

log level = 0
syslog = 0
log file = /var/log/samba/log.%U
max log size = 100000
time server = Yes
socket options = TCP_NODELAY SO_RCVBUF=8192 SO_SNDBUF=8192
mangling method = hash2
#Dos charset = 850
Dos charset = CP932
#Unix charset = ISO8859-1
Unix charset = UTF-8

logon script = logon.bat
logon drive = H:
logon home =
logon path =

domain logons = Yes
domain master = Yes
os level = 65
preferred master = Yes
wins support = yes
#wins support = no
# passdb backend = ldapsam:"ldap://ldap1.company.com ldap://ldap2.company.com"
passdb backend = ldapsam:ldap://ldap.ldaptest.com/
ldap admin dn = cn=Manager,dc=ldaptest,dc=com
#ldap admin dn = cn=samba,ou=DSA,dc=company,dc=com
ldap suffix = dc=ldapsomo,dc=com
ldap group suffix = ou=Groups
ldap user suffix = ou=Users
ldap machine suffix = ou=Computers
#ldap idmap suffix = ou=Idmap
add user script = /usr/sbin/smbldap-useradd -m "%u"
#ldap delete dn = Yes
delete user script = /usr/sbin/smbldap-userdel "%u"
add machine script = /usr/sbin/smbldap-useradd -t 0 -w "%u"
add group script = /usr/sbin/smbldap-groupadd -p "%g"
delete group script = /usr/sbin/smbldap-groupdel "%g"
add user to group script = /usr/sbin/smbldap-groupmod -m "%u" "%g"
delete user from group script = /usr/sbin/smbldap-groupmod -x "%u" "%g"
set primary group script = /usr/sbin/smbldap-usermod -g '%g' '%u'
admin users = admin

# printers configuration
#printer admin = @"Print Operators"
load printers = Yes
create mask = 0640
directory mask = 0750
#force create mode = 0640
#force directory mode = 0750
nt acl support = No
printing = cups
printcap name = cups
deadtime = 10
guest account = nobody
map to guest = Bad User
dont descend = /proc,/dev,/etc,/lib,/lost+found,/initrd
show add printer wizard = yes
; to maintain capital letters in shortcuts in any of the profile folders:
preserve case = yes
short preserve case = yes
case sensitive = no

[netlogon]
path = /home/netlogon/
browseable = No
read only = yes

[profiles]
path = /home/profiles
read only = no
create mask = 0600
directory mask = 0700
browseable = No
guest ok = Yes
profile acls = yes
csc policy = disable
# next line is a great way to secure the profiles
#force user = %U 

Copyright Andrew Tridgell and the Samba Team 1992-2012
[2014/08/15 10:10:51, 0] ../source3/param/loadparm.c:3121(lp_do_parameter)
Ignoring unknown parameter "min passwd length"
 

[2014/08/15 10:13:11, 0] ../source3/smbd/server.c:1200(main)
smbd version 4.0.0rc4 started.
Copyright Andrew Tridgell and the Samba Team 1992-2012  

smbd dead but pid file exists