[Samba] Upgraing a DC using the 'DC rejoin' method

[Roy Eastwood]

On 18/09/2019 13:10, Rowland penny via samba wrote:
> On 18/09/2019 12:34, Roy Eastwood via samba wrote:
> > I used the DC rejoin method as described in the WiKi to upgrade one of my DCs to version 4.11.0.   Following the steps, when I
came
> > to rejoin the domain, it initially failed, complaining that the DC already existed, but to force the rejoin, remove the files:
> > secrets.ldb and secrets.tdb.   I assume you don't demote the DC before the upgrade, as there's no mention of this?   Anyway, I
> > removed (actually renamed to .bak) those files and also smb.conf and repeated the rejoin command.    This time it succeeded and
> > after correcting errors with samba-tool dbcheck for the new join all looks OK.
> 
> You cannot join something that AD still thinks is joined, that is why I
> think that calling it a rejoin is a misnomer.
> 
> You need to demote the DC, clean up the Samba directories, upgrade Samba
> and then join it as a DC again. All you would retain is the hostname and IP.
> 
> >
> > Does the WikI need updating or did I miss something?
> >
> Yes, the wiki needs updating and no, you didn't miss anything.
> 
> Rowland

Thanks Rowland.  
Whilst what I did seems to have succeeded, do you think I should repeat the process as you describe - ie demote, clean up and join
again?
Roy