What are the disadvantages of such an approach?

Question

Domain Name System

If you set up a subdomain in the dns settings, not through cname, but simply * and already with the Apache / nginx settings, listen to each ServerName. What are the disadvantages of such an approach?

Answer 1

in the first case, you clearly create a list of subdomains, and control at the web server level. Those. a request to a non-existent subdomain simply will not reach your server.
In the second - requests for any subdomain are transmitted to your server.
Personally, I am a supporter of the second approach - the dns and web server configuration is simplified