Hello Brian,

you're totally right about that, this is some system info

root@ns1:~#*lsb_release -a*
No LSB modules are available.
Distributor ID: Ubuntu
Description:    Ubuntu 22.04.2 LTS
Release:        22.04
Codename:       jammy

root@ns1:~# *uname -a*
Linux /ns1.fqdn.name/ 5.15.0-69-generic #76-Ubuntu SMP Fri Mar 17 17:19:29 UTC 2023 x86_64 x86_64 x86_64 GNU/Linux

root@ns1:~# *pdns_server -v*
Apr 17 14:44:14 Loading '/usr/lib/x86_64-linux-gnu/pdns/libbindbackend.so'
Apr 17 14:44:14 [bind2backend] *This is the bind backend version 4.7.4* (Apr 17 2023 07:23:58) (with bind-dnssec-db support) reporting Apr 17 14:44:14 Loading '/usr/lib/x86_64-linux-gnu/pdns/libgmysqlbackend.so' Apr 17 14:44:14 [gmysqlbackend] *This is the gmysql backend version 4.7.4* (Apr 17 2023 07:23:58) reporting
Apr 17 14:44:14 This is a standalone pdns
Apr 17 14:44:14 Previous controlsocket '/var/run/pdns/pdns.controlsocket' is in use



Il 17/04/2023 14:23, Brian Candler ha scritto:
I suggest you specify the version of pdns authoritative you're running, otherwise this isn't reproducible by anyone.  Also what backend you're using and how you're adding/removing records, although I'm guessing it's probably the bind backend.


On 17/04/2023 12:50, Andrea Biancalani via Pdns-users wrote:

4) edit the zone example.com and modify contents like this

    @    IN ALIAS 60 mytest.example.com.
    www IN CNANE 60 @.



5) commit changes, it will popup an error

*RRset www.example.com. IN CNAME: Conflicts with pre-existing RRSET*


(assuming you meant "CNAME" not "CNANE")

The implication is that there is some other record for "www.example.com"

What does the following command show at that point?

dig @x.x.x.x www.example.com. any

(where x.x.x.x is your pdns-auth server's address)



6) delete now the www record and commit changes
7) create now the same record, as before

    @    IN ALIAS 60 mytest.example.com.
    www IN CNANE 60 @.



8) commit changes, and /voilà /... *SUCCESS: Applied changes successfully.
*

Is it possible that you deleted other records for "www.example.com" at the same time?

Again, what does "dig @x.x.x.x www.example.com. any" show at this point, and is it different to case 5?




--
Andrea Biancalani - /Rep. Commerciale e Tecnico/
*Connessioni Metropolitane srl*
Via G. Valentini, 14 - Prato (PO) - 59100
Sito web: https://www.conmet.it
Tel. 0574 536553
Fax. 0574 536554
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