[Samba] samba AD - bind - deleted DNS entries are not removed completely

[Rowland Penny]

On Wed, 21 Nov 2018 19:39:53 +0100
Kacper Wirski via samba <samba at lists.samba.org> wrote:

> To answer my own question:
> 
> Yes, it's seems like a feature.

Yes, it is a feature, an AD feature ;-)

> 
> I ran basic ldbsearch query:
> 
> ldbsearch -H /usr/local/samba/private/sam.ldb -b 
> "DC=DomainDnsZones,DC=mydomain,DC=com" and saw in output entries with:
> 
> dNSTombstoned: TRUE
> 
> Overall there are a couple hundred entries with as such. So now my 
> question is:
> 
> How can I safely remove them, any tips/guideliness? I thought that
> doing tombstone expunge would get rid of them - but apparently not.
> 

Have a look here:

https://blogs.technet.microsoft.com/isrpfeplat/2010/09/23/dns-scavenging-internals-or-what-is-the-dnstombstoned-attribute-for-ad-integrated-zones/

It seems that the DC is supposed to scavenge the stale dns records
after a certain period, usually 7 days, but it looks like Samba doesn't
have the code, unless someone knows different.

Rowland