How much RAM is needed to host 1000 domains?
Also, which is the most lightweight DNS daemon I can install on a Debian server? The DNS will be very basic (only an A record).
I'm hoping to use as least as possible, as my budget is not very big. There will also be a web server running on the same machine (serving a basic PHP redirect).
And, considering I only have 1 IP, is there any service offering free secondary DNS?