[Samba] Samba 4 AD BDC (Syncrepl)

Alex Crow acrow at integrafin.co.uk
Mon Jan 30 20:07:29 UTC 2017

On 25/01/17 14:55, basti via samba wrote:
> Hello,
> at the Moment we use and Samba 4 in NT4-style Domain with approx. 20
> Clients.
> With the Problem of Windows 10 to join to NT4-style
> (https://wiki.samba.org/index.php/Required_Settings_for_Samba_NT4_Domains#Windows_10:_There_Are_Currently_No_Logon_Servers_Available_to_Service_the_Logon_Request)
> we plan to migrate to Samba AD.
> At the Moment there is the following scheme:
> samba PDC (Fileserver) -> Openldap syncrepl to Mailserver (to receive
> mails if PDC is down)
> As I can read Samba LDAP can't sync to OpenLDAP and it's not recomment
> to run PDC on Fileserver.
> What is the best way?
> samba PDC (kvm vm/ host1) <- drs -> Samba BDC (kvm vm/ host2)
> Fileserver, get users via pam_ldap from PDC.
> Mailserver, get users via pam_ldap from PDC.
> How does the mailserver know to ask the bdc if pdc is down?
> Or should I place the bdc on mailserver?
> Best Regards,
> Basti


You can't replicate between AD and OpenLDAP.

There are two ways to go (and you should avoid using a DC as a
fileserver, it may work for you but it's less painful to just set up new

1) Change your mail server to talk to AD, preferably set up multiple AD
DCs and have them fail over. Dovecot and Postfix make this very easy.
2) Set up a caching OpenLDAP proxy to AD, point the backend LDAP DB to
all your DCs. OpenLDAP have docs on a proxy cache, it's quite easy to
get it working. You may need to tune your queries and timeouts.



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