Ideas to scale 1000 sub-domain websites beyond one server?

I'm running a service that allows people to easily get a website with their own sub-domain of my company domain.

So they can have something like exampleuser.mycompanydomain

At the moment I have DNS setup so that I can have wildcard sub-domains on my one server. However when I have more than say 200 customers I will be pushing the limits of my server and want to spread customers among different servers.

But how do I route all the sub-domains to different servers? Will I have to set them up individually in the DNS server and httpd.conf?

 

 

 

 

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