[Pdns-users] CNAME RRset issues
b.candler at pobox.com
Fri Mar 26 20:43:34 UTC 2021
On 26/03/2021 20:29, Larry Wapnitsky via Pdns-users wrote:
> I'm looking to replace A records with CNAMES, and have been able to do so seamlessly on one of my domains, but another keeps giving me errors relating to RRSET conflict ( IN CNAME: Conflicts with pre-existing RRset).
>> I've deleted the necessary A records, yet keep running into the same issue.
At any given point in the tree, you can't have both a CNAME and any
other resource record.
foo.bar.baz. IN MX mail.example.com.
foo.bar.baz. IN CNAME abc.def.ghi. ; NOT ALLOWED because it
conflicts with the MX record
This is most commonly a problem at the apex of a zone, where there are
already SOA and NS records.
The 'ALIAS' pseudo-RR exists to solve this problem. It's not served
directly, but when an incoming A/AAAA request arrives, the right-hand
side of the ALIAS record is resolved (externally), and then the result
of that is returned as the result of the original query.
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