[dns-operations] Docker

[sthaug at nethelp.no]

> I've never used Docker, but IIUC it does weird things with networking.
> Here are a few GitHub issues:
> 
>     https://github.com/docker/docker/issues/8357
> 
>     https://github.com/docker/docker/issues/11998
> 
>     https://github.com/CZ-NIC/knot-resolver/issues/28
> 
> So, if you do end up trying it out, make sure to budget time for dealing
> with weird networking issues.

Trying to avoid complexity and issues like the ones mentioned above is
why I run my name servers on bare metal. YMMV.

Steinar Haug, AS2116