How to set up dynamic subdomains as aliases of the main domain?

Question

Apache HTTP Server

There is a site with the site.ru domain.
It is necessary that for any subdomain name:
aaa.site.ru
bbb.site.ru
, etc.
, content from the site.ru main page is displayed . After reading
similar questions, I realized that I need to do three things:
1. Add DNS A record
2. Change apache config
3. Change
.htaccess there is no control panel on the server, and using the command line I don’t know how to add an A record
Please tell me what steps need to be taken to add an A record via the command line?
PS VDS Ubuntu 16.04

Answer 1

You need to edit the domain zone. This is done on NS servers. In your case, they may not be local, but, for example, at the registrar or hosting provider.

Answer 2

If you have administrator rights for the site.ru zone, you simply take and edit it as you need. If there is no right, no way.
You cannot add an A-record from the command line (well, apart from "echo test IN A 1.2.3.4 >> zone.txt" of course). For this, text editors or web muzzles are usually used :)

Answer 3

How to create dynamic subdomains?