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domain name system - Dynamic subdomain routing

I asked this question over at stackoverflow, but got very
few views: href="https://stackoverflow.com/questions/2284917/route-web-requests-to-different-servers-based-on-subdomain">https://stackoverflow.com/questions/2284917/route-web-requests-to-different-servers-based-on-subdomain



Perhaps
it's more applicable to this crowd. Here it is again for
convenience:



I have a platform where a user can
create a new website using a subdomain. There will be thousands of these, eg
abc.mydomain.com, def.mydomain.com . Hopefully if we are successful hundreds of
thousands.



I need to be able to route these
domains to a different IPs to point at a particular app server. I have this mapping in a
database right
now.




What are the best
practices and recommended technologies
here?



I see a couple
options:




  1. Have DNS setup
    with a wildcard CNAME entry so that all requests go to a single IP where perhaps two
    machines using heartbeat (for failover) know how to look up the IP in the database and
    then do an http redirect to the appropriate app server. This seems clunky and slow to
    me.

  2. Run my own DNS server that can be programatically
    managed such that when a new site is created a DNS entry is added. We also move sites
    around to different app servers, so I would need to be able to update DNS entries in
    close to real time.
    Thoughts
    anyone?




Thanks.



Update2:
I've setup external wildcard DNS pointing at an HAProxy web server whose job it is to
route requests to backend servers. The mapping is stored in our internal PowerDNS
server. Question now is how to get the HAProxy server (or another) to use the value of
the internal DNS and not some config file or access list?
–



Update: Based on
some suggestions below, it seems like reverse-proxy server(s) is the way to go. As I'll
be rebalancing the domain->server mapping, these need to work instantly and the TTL
on a DNS solution could be a problem. Any recommendations on software to use considering
this domain->IP data is stored in a DB, and I'll need this to be
performant?

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