you even get a link to the RFC when installing kubernetes with the default domain name (which is local). I sadly forgot the number, so cant cite it.
To clarify:
It /used/ to be that .local wasn't mentioned in any standard.
Don't do anything like .local (a non TLD and not part of a standard), because there is now a history of standards being created that break existing private deployments, and also because OTHER TLD like things can now be purchased as TLDs. That is why the current best practice is now to have an internal subdomain of a real domain (even if not globally published).
from wikipedia:
> The Internet Engineering Task Force (IETF) standards-track RFC 6762 (February 20, 2013) reserves the use of the domain name label local as a pseudo-top-level domain for hostnames in local area networks that can be resolved via the Multicast DNS name resolution protocol.[1] Any DNS query for a name ending with the label local must be sent to the mDNS IPv4 link-local multicast address 224.0.0.251, or its IPv6 equivalent FF02::FB. Domain name ending in local, may be resolved concurrently via other mechanisms, e.g., unicast DNS.
That changed; this is what people are / were mad about.
The point is that some standard CAN change any other similar thing at any point in the future; particularly now that you can buy a TLD.
Thus the lesson is, buy a real name and reserve the namespace.