Adding new domains without restarting

[Todd Snyder]

Good day to all,

I work in a highly change controlled environment, and one of the things
that flags a change as no-go is having to restart named due to the risk
of taking down a functional server due to a misconfig.

We have mitigated this to some extent by using rndc reloads to load new
zone info, allowing for lower risk changes to zones.  However, adding
new zones is still considered high risk, as a restart of the daemon is
required.  Additionally, we lose the cache, which could negatively
impact service.

So my question is this - is it possible to add a new zone to a currently
running server and have it load?  If there are named.conf/zonefile
typos, will that impact any currently running zones?  I suspect that
rndc recofig may do what I want, however finding definitive information
about exactly what is going on, and what the risks are, is diffcult.
The googles are failing me today, or my google fu is weak.  

They key features I need are that existing functional zones couldn't be
impacted, and the cache isn't lost.  

Thanks for the help,

Cheers,

Todd.

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