DNS - RedHat

Hey...I am using www.ultradns.com to set up my DNS servers for my clients. I am using apache web server on my RedHat7 system.
I do not want to buy a unique ip address for each domain. How do I tell my nameserver what directory to go to on my machine? for example /users/client1 and /users/client2. How do I define those so I dont have to buy more IP's. Please get technical with me and be specific. Thank you.

 

 

 

 

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