First you need create an wilcard "*" "A" record for your "example.com", and use headers from request data to get "Host" "user.example.com" when user visit the page.
Browser -> "user.example.com" -> Server -> Request header "Host" -> Output
@trickymast3r What about SSL certs? do I have to generate a new one for each subdomain
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First you need create an wilcard "*" "A" record for your "example.com", and use headers from request data to get "Host" "user.example.com" when user visit the page.
Browser -> "user.example.com" -> Server -> Request header "Host" -> Output
@trickymast3r What about SSL certs? do I have to generate a new one for each subdomain