What should do to setup a sub-domain for the users when they sign-up into my site.
What are the infrastructure required? I am using Linux servers.
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You can make a CNAME entry/ A Record in your DNS settings, for each subdomain
To automate it along with registration, you can write a script which is executed for each user, when s/he registers.
You can refer to this link, as well, for a step-by-step process for Apache:
How to setup subdomains in apache
(since you mentioned Linux, I assume it must be APache. Please mention if it is otherwise)
Alternate Solution
You can also refer to the wildcard solution, given by Alnitak, in the same thread. I find his is an easier way. 🙂