How can I launch a private Internet DNS server?

[Michael De Roover]

On Thu, 2020-11-05 at 11:31 +0100, Alessandro Vesely wrote:
> A good secondary offloads your server
> noticeably, and 
> keeps the domain alive in case of temporary failures.

AFAIK, authoritative slave servers are only used when the master is
confirmed to be down. Lookups take significantly longer in such cases
since for every request, the master will be asked first. This can take
between 2-4s. There are no performance benefits to running multiple
name servers as master-slave, though it's fairly easy and offers good
redundancy (a slow lookup is still better than no lookup). A commercial
service will have to support zone transfer from your master, and said
master has to have that commercial service authorized to pull your
zone(s). I haven't personally heard of such services, and would
probably just run another BIND box somewhere else (different hosting
provider or something like that).
-- 
Michael De Roover <isc at nixmagic.com>