How to rewrite a domain to a subfolder - redirect

Question

I have one local server called server1 with a subdirectory sub (server1/sub/).
Now i have a dns entry which redirects server2 to server1.
I want to configure my apacher server in a way that when I open server2 in a browser I get the content from server1/sub/.
The url should not change to server1/sub/.
Is this possible with mod_rewrite?
EDIT:
I added
127.0.0.1 localhost
127.0.0.1 wiki2
127.0.0.1 wiki3
to the hosts file and
VirtualHost 127.0.0.1>
ServerName wiki2
ServerAlias 127.0.0.1
DocumentRoot c:/xampp/htdocs/wiki_angua
<Directory c:/xampp/htdocs/wiki_angua >
Allow From All
</Directory>
</VirtualHost>
<VirtualHost 127.0.0.1>
ServerName wiki3
ServerAlias 127.0.0.1
DocumentRoot c:/xampp/htdocs/weatherwax
<Directory c:/xampp/htdocs/weatherwax >
Allow From All
</Directory>
</VirtualHost>
to httpd.conf and restarted apache.
Whether I open wiki2 or wiki3 I land in ./wiki_angua.
Is there anything I forgot?

Answer 1

If you have a DNS entry for server2 then the Host HTTP request header will be correctly set, and all you need then is a virtual host, without the need to use mod_rewrite.
For example:
<VirtualHost *:80>
ServerName server2
DocumentRoot /path/to/server1/sub
<Directory /path/to/server1/sub>
Allow From All
</Directory>
# ... etc
</VirtualHost>
edit:
In the case you still want to use mod_rewrite you can do something like:
RewriteCond %{HTTP_HOST} ^server2$
RewriteRule ^(.+) /path/to/server1/sub/$1
This must be located in the global server configuration, and not in an existing virtual host.