I plan to move an external DNS server to a hosted VPS in the near future. I would appreciate advice on VPS specs for this purpose, or an other helpful feedback from others who have done this before. I’ve used a lot of low end boxes to host web services, and would like to do that with this project as well but don’t want to under spec it. It will be used regularly by around 300 users.
Okay, then I think you will be good with around 2GB and 2 cores. I cannot speak highly enough for using Unbound or NSD. As of about two or three years ago, an authoritative DNS capability was added to Unbound and I cannot speak highly enough of it. I’ve used Unbound in production reliably for that long. After moving my domains to Cloudflare though, I found DNS resolution to be speedier simply because the DNS servers sit on an isolated segment instead of mixing traffic so I went that way. But I would go back to using Unbound in a heartbeat if Cloudflare decided to do something stupid. Which is always a distinct possibility because, well, it’s Cloudflare.
Thanks for the detailed response! I will definitely check out unbound. Sounds perfect. And 2 cores and 2 GB RAM is exactly what I was hoping would be enough, so I can keep costs down.