[Samba] Error joining Samba 4.7.4 DC to existing Win2008R2 domain

[Claudio Nicora]

 > Garming asked you to see if you could locate
 > where the records got put the records by hand

Sorry, I can't understand what you mean with "if you could locate where 
the records got put"...
Are you're asking me to create the DNS record by hand with RSAT on 
SRVAD_OLD, then run samba-tool join again?
If so, yes I've tried to create the record manually and re-run 
samba-tool with the same error.

Sorry for the misunderstand

>> I'm still focusing on log lines after the failure:
>>
>> --- no SRVAD-OLD address in /etc/hosts ---
>> Join failed - cleaning up
>> ldb_wrap open of secrets.ldb
>> Could not find machine account in secrets database: Failed to fetch
>> machine account password for SAMDOM from both secrets.ldb (Could not
>> find entry to match filter:
>> '(&(flatname=SAMDOM)(objectclass=primaryDomain))' base: 'cn=Primary
>> Domains': No such object: dsdb_search at
>> ../source4/dsdb/common/util.c:4636) and from
>> /var/lib/samba/private/secrets.tdb: NT_STATUS_CANT_ACCESS_DOMAIN_INFO
>> ---
> This isn't it.  The things after the failure are not the issue, they
> are happening in the unwind.
>
> You can see the real failure in the backtrace, where it fails to find
> the records using our DNS client library for LDAP (yes, a very strange
> thing).
>
> As Garming said, the issue is that Samba can't find the DNS records on
> your AD DC over LDAP, having just added them via RPC.
>
> This code is a bit tricky, and I thought I had it right, but clearly
> that isn't the case.  Garming asked you to see if you could locate
> where the records got put the records by hand.
>
> Thanks,
>
> Andrew Bartlett
>