14.3.3.3. Backup Domain Controller (BDC) using LDAP

A BDC is an integral part of any enterprise Samba/LDAP solution. The smb.conf files between the PDC and BDC are virtually identical except for the domain master directive. Make sure the PDC has a value of Yes and the BDC has a value of No. If you have multiple BDCs for a PDC, the os level directive is useful in setting the BDC election priority. The higher the value, the higher the server priority for connecting clients.

Note

A BDC can either use the LDAP database of the PDC or have its own LDAP database. This example uses the LDAP database of the PDC as seen in the passdb backend directive.
[global] workgroup = DOCS
netbios name = DOCS_SRV2
passdb backend = ldapsam:ldap://ldap.example.com
username map = /etc/samba/smbusers
security = user
add user script = /usr/sbin/useradd -m %u
delete user script = /usr/sbin/userdel -r %u
add group script = /usr/sbin/groupadd %g 
delete group script = /usr/sbin/groupdel %g 
add user to group script = /usr/sbin/usermod -G %g %u
add machine script = \
 /usr/sbin/useradd -s /bin/false -d /dev/null \
 -g machines %u
# The following specifies the default logon script 
# Per user logon scripts can be specified in the
# user account using pdbedit
logon script = scripts\logon.bat
# This sets the default profile path.
# Set per user paths with pdbedit
logon path = \\%L\Profiles\%U
logon drive = H:
logon home = \\%L\%U
domain logons = Yes
os level = 35
preferred master = Yes
domain master = No
ldap suffix = dc=example,dc=com
ldap machine suffix = ou=People
ldap user suffix = ou=People
ldap group suffix = ou=Group
ldap idmap suffix = ou=People
ldap admin dn = cn=Manager
ldap ssl = no
ldap passwd sync = yes
idmap uid = 15000-20000
idmap gid = 15000-20000
...

# Other resource shares
...
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