I manage a cluster of cPanel shared hosting servers and am considering utilising cPanel DNS only to run two (or more) dedicated DNS servers separate from the hosting servers. I'm hoping this will give me much more flexibility in moving hosting accounts between shared hosting servers.
I'd like some thoughts on a suitable specification for machines running cPanel DNS only.
Understandably what is required of a dedicated DNS server in terms of specs is, to an extent, dependent on the number of DNS records being served from it.
What I'm trying to get an appreciation of is what is required of a cPanel DNS only machine compared to a full cPanel machine.
The DNS only machine doesn't have a mail server, web server, database server and other related non-DNS applications that are present on a regular cPanel server. Therefore compared to what is required of a regular cPanel server, a cPanel DNS only server could be relatively lower powered in terms of CPU and RAM.
I don't have any experience using cPanel DNS only and so am unaware of how demanding, or not, cPanel DNS only is compared to a regular cPanel server. I'm thinking that RAM is much less of a concern but how little is needed, or what a realistic maximum may be, I can't say.
Does anyone have any experience in dealing with cPanel DNS only? How do the specs of your cPanel DNS only machines compare to your regular cPanel machines? Would something as low spec as a small VPS do the trick, or would going fully-dedicated be better and if so why?