[Samba] Online Backup Fails - list index out of range

[Andrew Bartlett]

On Thu, 2019-08-29 at 22:59 +0100, Roy Eastwood via samba wrote:
> > -----Original Message-----
> > From: Tim Beale [mailto:timbeale at catalyst.net.nz]
> > Sent: 29 August 2019 22:08
> > To: Roy Eastwood; samba at lists.samba.org
> > Subject: Re: [Samba] Online Backup Fails - list index out of range
> > 
> > 
> > > Is this another bug?
> > 
> > It's not really a bug. The backup process needs to allocate a new RID
> > and the DC you're running the backup against doesn't have a RID pool
> > allocated. E.g. see:
> > 
> > https://lists.samba.org/archive/samba/2019-February/221619.html
> > 
> > I have improved the error message you get in this case on master, but I
> > haven't backported this yet.
> 
> Thanks for that.   I still don't understand though as the DC on which I am doing the backup is the RIDAllocationMasterRole owner (actually it owns all the FSMO roles), so shouldn't it be able to provide a new RID?      Or am I missing something?

It will do that when you create a user on that domain.  We don't modify
the domain we are backing up so we can't do this properly, instead we
emulate the algorithm locally.

The typical case is a backup of a DC that has just joined the domain,
but recent Samba versions explicitly get a RID pool on join for
reliability, so that shouldn't happen any more.

Andrew Bartlett
-- 
Andrew Bartlett
https://samba.org/~abartlet/
Authentication Developer, Samba Team         https://samba.org
Samba Development and Support, Catalyst IT   
https://catalyst.net.nz/services/samba