Complex URL Mapping

[Sai A <arialwinds@xxxxxxxxx>]

Hi,

I am trying to figure out how to achieve the following with Apache HTTP Server 2.0 which routes all request to a cluster of application servers.

I have a bunch of applications running on various subdomains on a site. Broadly there are 3 categories of sites running on a domain name www.company.com. 

1) productx.company.com 
These are more or less static sites.

2) client1.company.com, client2.company.com etc. 
These are the homepages of the clients' sites.

3) admin.company.com 
This is the admin site where all the clients can login to see client specific details that relate to the company, update their profiles etc. So client1 uses the URL admin.company.com/dashboard/client1 for his admin login.

Now *some* of the clients want to move to their own domain names. They want to be able to access their homepage (client1.company.com) at www.client1.com. And their admin dashboard at www.client1.com/dashboard. However the first category of sites above still needs to remain operational and category 2 and 3 would need to be operational as well (for those who don't opt for their own domain names)

To summarise:
1) productx.company.com 
2) client1.company.com --> www.client1.com (for some clients alone)
3) admin.company.com/dashboard/client1 --> www.client1.com/dashboard (for the same clients in 2)

I have been reading the documentation to figure out the best way to do this. Initially it looked like I could achieve it using a simple configuration of 
ProxyPass and ProxyPassReverse like the following (just the small excerpt) for each of the clients who opts for his own domain name.

<VirtualHost client1.com>

Server client1.com

ProxyPass /         http://client1.company.com
ProxyPass /dashboard/        http://admin.company.com/dashboard/client1/
ProxyPassReverse /           http://client1.company.com/
ProxyPassReverse /dashboard/         http://admin.company.com/dashboard/client1/

<Location /dashboard/client1/>
        ProxyHTMLURLMap /       /dashboard/
</Location>

</VirtualHost>

My first question is would the above approach work for the above scenario (productx.company.com working as always and the old and new client specific URLs working as intended.)

There would be about 1000 clients for the company (or more, I am not sure). I was wondering if there would be a simpler way to do it, without adding virtual hosts for every client. 

I was wondering if mod_rewrite would be the only approach if I don't want virtual hosts for each client. I am not sure if I'd be allowed to create virtual hosts, so would want to proceed to do that if that is the only way. If there is some way that is easier/better than virtual hosts/mod_rewrite, that would be great. Please do let me know your suggestions.

Any help is greatly appreciated. Thanks in advance.