[Samba] CTDB and PDC Role
acrow at integrafin.co.uk
Tue Nov 2 14:26:39 MDT 2010
> Well, depending on your passdb backend this might or might
> not work. I would not count on file system failover to get
> the passdb.tdb right in all cases. Probably I am too
> paranoid here, as we're using proper tdb transactions these
> days, but between a CPU and a disk spindle in a SAN setup
> too much can go wrong for my taste.
Understood - but given my other bug reports and postings here I find
that even without clustering there have been changes I cannot get to
grips with (and as per my usual story it's to do with Winbind and
trusted domain - if you could cast an eye on these I would be most
grateful. Level 10 logs from my test domain will be supplied if required.
> The main difference between a PDC and a BDC in a Samba setup
> is the "domain master = yes/no". It is really just a matter
> of setting that to yes and a restart of smbd and nmbd to
> promote a BDC to a PDC.
>> 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?
> Details pending, the general idea sounds okay. But please be
> aware that in HA setups so much can go wrong that it's not
> funny anymore. The devil is really in the details.
Well, to add to the pile, I've tested by on a domain member client
machine (on a different subnet to the PDC and one BDC, but the same
subnet as another BDC) by editing windows/system32/drivers/etc/hosts to
point to invalid IPs for the non-local PDC and BDC. I could log on via
rdesktop but not via UltraVNC using Windows auth, and after logging on
via RDP in the permissions dialog for local files, domain users were not
enumerated (SIDs only displayed).
Is this a WINS problem? If so, I think that it should be stated (unless
it is already) in the documentation that if your PDC fails you *must*
configure one of your BDCs as a WINS server.
(3.4.9 on all DCs and member servers)
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