[Samba] CTDB and PDC Role

Alex Crow acrow at integrafin.co.uk
Tue Nov 2 12:48:38 MDT 2010

On 02/11/10 08:01, Volker Lendecke wrote:
> 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
> all.
> 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.
> Volker
I asked a question like this ages ago:

If you had a shared filesystem between the PDC and BDC(s) then surely 
you wouldn't need to migrate your BDC to a PDC automatically, you could 
do it at your leisure. The only thing is the WINS server, which you 
could either provide on a very reliable box or one with conventional 
failover (no CTDB) as you won't be serving files or logons from this 
machine; alternatively use smb4wins.

For your logon scripts and profiles in your LDAP you'd just point to a 
virtual IP/hostname of the PDC/BDC cluster.

Volker, would this work?



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