[Samba] Network rebuild advice needed

Peter Pollock peter.pollock at kingschristian.org
Sat Aug 29 21:44:55 UTC 2020

Thank you for your assistance.

Turns out everything is really really screwed up and I can't even add a DC
right now. I thought I had added a third and it seemed to be replicating
but now the other two won't recognize it as a DC.

I'm so deep in this hole right now I'm considering nuking the whole thing,
quitting my job and moving to a desert island. It seriously couldn't make
it any worse.

On Sun, Aug 16, 2020 at 11:39 PM Rowland penny via samba <
samba at lists.samba.org> wrote:

> On 17/08/2020 04:21, Peter Pollock via samba wrote:
> > So I screwed up my AD.
> >
> > At some point a Windows 2019 server was attempted to be added and it
> messed
> > the schema up.
> >
> > That server was removed and ceremonially burned in the fire pit but I
> > couldn't fix the issues that had arisen, so I restored both of the
> original
> > Samba DC's from backups
> That is probably where your main problems start, you should never
> restore an individual DC, you only restore a domain. You restored two
> DC's from backups, were the backups taken at exactly the same time ?
> What you should have done was, restore one DC, seize all FSMO roles to
> this DC, forcibly demote any other DC's and then clean up the other DC's
> and rejoined them to the domain as new DC's
> > and everything LOOKS OK on the surface, but they're
> > not replicating and for some reason some of the permissions on the drive
> > containing the home folders got changed even though the restore had
> nothing
> > to do with that drive... and there are other weird issues, like the
> windows
> > computers trying to log on randomly say there is no trust relationship
> > between them and the domain.
> >
> > It's all weird and I can't work out how to fix any of it.
> >
> > I built a new DC (DC3) and that initially got a copy of everything from
> one
> > of the original DC's but after that they won't replicate to it. It can
> > replicate outbound with both of the other DC's but not inbound and DC1
> and
> > DC2 won't replicate with each other at all.
> >
> > We are a small school and have virtually zero budget (latest DC is built
> on
> > an old desktop, so it can't stay around forever) but I've managed to get
> > funding for a new server, which might help.
> >
> > One of my big problems is that we only have (or had) 2 servers. I
> couldn't
> > risk not having a backup DC so I built them both as samba DC's - but one
> is
> > also the fileserver. (I know, fileserves shouldn't be DC's but I didn't
> > have much choice).
> >
> > I don't know how to fix the problems and have decided I probably need to
> > rebuild both of the problem servers from scratch, but my understanding is
> > that if I do that, I have to demote them then rebuild them with different
> > names so the AD doesn't get confused. Is that right?
> You can re-use the names, but you must ensure the DC is fully demoted
> and cleaned up before the join.
> >
> > My issue there is the shares on the fileserver. All the windows drive
> > mappings on the client machines are to \\dc02\sharename  - and they won't
> > work any more if I rebuild with a different server name. Is there a way
> to
> > migrate them across?
> >
> > My fear is also that there is something screwy with the schema even now
> and
> > just rebuilding won't fix that so I'm wondering if I should start again
> > from scratch with a completely new domain, somehow import all the user
> > details and go around manually rejoining all the workstations.
> If you have a backup from before the Windows 2019 DC was joined, you
> should be able to fix this, but you will lose any changes made to AD
> after the backup was made.
> >
> > I'm looking for advice here. I know I've messed up bad but I have to try
> to
> > fix it, although that's hard because now school is back in session I
> can't
> > do anything during the day, partly because I'm teaching and partly
> because
> > the teachers rely on the network for their teaching. I'm going to take
> the
> > school offline in a couple of weeks for an entire weekend to fix this
> > nonsense... I just don't know what the best way to go about fixing it is?
> It sounds like you now have three machines to use, perhaps use one as a
> Unix domain member running as a fileserver and the other two as DC's.
> Rowland
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