Creating a virtual submdomain and redirection?

[webtester01]

Let's say I have two domains.

http://domainA.com and http://domainB.com

domainA is merely use as a 301 redirect to domainB. So, I want to use domainA to create virtual subdomains -- is this possible?

For example, http://testing.domaina.com would redirect to http://domainb.com/blog/testing

I used the code below (as a hypothetical example), but it didn't work.

I tested http://testing.domaina.com but it gives me an error (page not found).

RewriteCond {HTTP_HOST} !^domaina.com$

RewriteCond {HTTP_HOST} ^([a-zA-Z]+).domainb.com$

RewriteRule ^.*$ http://domainb.com/blog/%1

The other way is to manually create a subdomain on domaina.com each time by logging into Cpanel, but I don't want to do that each time for hundreds of subdomains.

[Tony]

Did you make sure to setup a wildcard subdomain in cPanel? You need to do this so putting * instead of subdomain. Then you set it to a document root folder then you can actually work with mod_rewrite to send it to specific internal url's.

[webtester01]

Didn't work.

I went to cpanel > Subdomains.

Let's say my main domain is maindomain.com

I see that there's

domaina.maindomain.com

So, for the subdomain input text, I put * and the document root is public_html/

domaina.com will contain the .htaccess of my script.

I tested http://testing.domaina.com but got a page not found error.

[Tony]

Did you allow for DNS propagation? Or was it simply a page not found displayed by the server? It might be best though if you make a support ticket someone might be able to assist you. Tough to offer advice when don't know your actual account.

[webtester01]

Thanks Tony "Hawk" Baird! The web skating man!

[Cody R.]

Thanks Tony "Hawk" Baird! The web skating man!

I'm assuming it's working then?