[Samba] CTDB and PDC Role

Daniel Müller mueller at tropenklinik.de
Tue Nov 2 02:13:59 MDT 2010

As far as I tried a pdc/bdc with ladp backend (Master/Slave). I always need
to point from both pdc and bdc to one wins.
So my pdc is exactly the wins and the bdc points to wins server=pdc. So if
the pdc fails there is no wins anymore. And in my case more than half of the
users could not authenticate anymore. So I never succeeded to have a 100%
If this have changed I would be happy to know.

EDV Daniel Müller

Leitung EDV
Tropenklinik Paul-Lechler-Krankenhaus
Paul-Lechler-Str. 24
72076 Tübingen

Tel.: 07071/206-463, Fax: 07071/206-499
eMail: mueller at tropenklinik.de
Internet: www.tropenklinik.de

-----Ursprüngliche Nachricht-----
Von: Volker Lendecke [mailto:Volker.Lendecke at SerNet.DE] 
Gesendet: Dienstag, 2. November 2010 09:01
An: Daniel Müller
Cc: 'Ciro Iriarte'; samba at lists.samba.org
Betreff: Re: [Samba] CTDB and PDC Role

On Tue, Nov 02, 2010 at 08:14:43AM +0100, Daniel Müller wrote:
> I just did the same questions months ago with no answer!?
> Now I am curious to here if this is working for now. In the past ctdb only
> worked for me only for file serving.

Well, and to a certain extent this is still true. ctdb has
no provisions to migrate the PDC role when the PDC node
fails. It would mean to restart nmbd, but in a typical
clustered file server nmbd is a bit difficult to set up
anyway. Most clusters I've set up so far don't have nmbd at

So I'd recommend to split the DC roles and the HA-fileserver
cluster using ctdb. You don't need the complexity of ctdb
for your DCs anyway, PDC/BDC is highly available implicitly.


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