How to make a subdomain for a website?

Question

Nginx

I have a working site, how can I add a subdomain? I created a directory, configured nginx, registered everything correctly, but nothing works. Maybe it needs to be registered with a domain name registrar?

Answer 1

It is not possible, but it is necessary.
And not at the domain name registrar, but in the DNS of the parent zone.
Someone already manages the zone, for example - site.ru and in this DNS zone you need to register a DNS record for the domain subdomain.site.ru