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Best practices for FQDN for standalone domain (is a two part domain.tld okay?)

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I've searched quite a bit and can't
seem to find a straight, modern answer on
this.



If I am hosting a domain, say,
mydomain.com, on a machine which is going to solely be used for
that domain, and there are no subdomains, is there a real, practical reason besides
compliance to create an arbitrary hostname (i.e. myhost) just
in order to have a three-part FQDN (myhost.mydomain.com) to
satisfy some sort of RFC or convention that's
expected.



This seems to make a lot of undue
complexities from my perspective, and I'm not sure if there's an
advantage to this or if it's just a hold-over from a time where all
web resources came from a subdomains such as www and
ftp which may need to scale to separate
machines.




I don't use
www on my domain, either, which is ill-advised for all I know
from an administrators perspective (though removing it is the norm from a designer's
perspective)...


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class="normal">Answer



You
should never give your server a name containing only the naked
domain name.



The primary reason is that many
services use the hostname internally, and may presume that the
server is named separately from the domain
name.



Among other things, this can cause href="https://serverfault.com/q/575638/126632">email to not be delivered.
It can also cause more subtle breakage, from programs which think your domain is
com because you have named the machine
example.com. A complete list of the things that could break is
probably not possible.



As long as you have only
a single server that you're href="http://www.theregister.co.uk/2013/03/18/servers_pets_or_cattle_cern/"
rel="nofollow noreferrer">raising as a pet, you can probably work around
the problems this will cause. But when you expand (you either will expand, or you'll go
out of business) then you're eventually going to start href="http://cloudscaling.com/blog/cloud-computing/pets-vs-cattle-the-elastic-cloud-story/"
rel="nofollow noreferrer">raising livestock, and at that point you're going
to have to shoot your pet.




I always
recommend keeping good habits and practices even when you don't strictly need to, since
when you do need them later, they will already be
ingrained.


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