[Samba] questions regarding the Demoting an Offline Domain Controller procedure

[Jean-Louis Biasini]

hi all,

I have questions regarding a DC that I had to demote following the 
Demoting an Offline Domain Controller procedure from here 
https://wiki.samba.org/index.php/Demoting_a_Samba_AD_DC.

1. The procedure went well and no other problems occured, but since then 
I have the following popping up in the log of all the remaining DCs at 
restart:

../../source4/dsdb/kcc/scavenge_dns_records.c:491(dns_delete_tombstones)
dns_delete_tombstones: A tombstoned dnsNode has non-tombstoned records, 
which should not happen.

How can I find and delete those remaining record? I don’t see anything 
related to the demoted DC with rsat DNS tool nor with:

ldbsearch -H /usr/local/samba/private/sam.ldb '(invocationId=*)' --cross-ncs objectguid

2. the procedure states that I shouldn’t reconnect et demoted offline 
dc, does this apply only to that specific machine? Can I declare a new 
dc with the same name and/or ip and/or mac address (VM) or should this 
also be avoided?

samba is Version 4.15.8 on Centos7 with bind dlz as dns backend


many thanks

Jean-Louis