Apache Virtual Host - Mod Proxy issues - apache

Question

Not too au fait with Apache, have setup simple virtual hosts before without an issue. Seem to be having a bizarre one, working with 1 IP address and multiple servers.
My second virtual host seems to only look at the first 2 entries and ignores the rest. I have mapped out what I want to happen and how my vhost file looks and the second image is what is happening.
How my virtual hosts are setup and envision the routing to act
How it's currently operating
Now it maybe not right using virtual hosts on both servers?
Not too au fait with Apache, have setup simple virtual hosts before without an issue. Seem to be having a bizarre one, working with 1 IP address and multiple servers.
My second virtual host seems to only look at the first 2 entries and ignores the rest. I have mapped out what I want to happen and how my vhost file looks and the second image is what is happening.
Server1
<VirtualHost *:80>
ServerName server1.domain.com
ServerAlias x.domain.com
DocumentRoot /var/www/html
</VirtualHost>
<VirtualHost *:80>
ServerName server2.domain.com
ServerAlias y.domain.com
ProxyPreserveHost On
<Proxy *>
Order allow,deny
Allow from all
</Proxy>
ProxyPass / http://server2
ProxyPassReverse / http://server2
</VirtualHost>
<VirtualHost *:80>
ServerName server2.domain.com
ServerAlias z.domain.com
ProxyPreserveHost On
<Proxy *>
Order allow,deny
Allow from all
</Proxy>
ProxyPass / http://server2
ProxyPassReverse / http://server2
</VirtualHost>
<VirtualHost *:80>
ServerName server2.domain.com
ServerAlias w.domain.com
ProxyRequests Off
<Proxy *>
Order deny,allow
Allow from all
</Proxy>
ProxyPass / http://server2
ProxyPassReverse / http://server2
</VirtualHost>
Server 2
<VirtualHost *:80>
ServerName server2.domain.com
DocumentRoot /var/www/html
</VirtualHost>
<VirtualHost *:80>
ServerName server2.domain.com
ServerAlias z.domain.com
DocumentRoot /var/www/html/z
</VirtualHost>
<VirtualHost *:80>
ServerName server2.domain.com
ServerAlias w.domain.com
DocumentRoot /var/www/html/w
</VirtualHost>
<VirtualHost *:80>
ServerName server2.domain.com
ServerAlias y.domain.com
DocumentRoot /var/www/html/y
</VirtualHost>

Answer 1

Avoid giving the same Servername to any two VirtualHost entries. Using x,y,z, etc names is perfectly ok (assumed all resolve to the one IP address from external users).
For simplicity (of maintenance and managing the configuration) also avoid mixing "standard" server configuration (e.g. x on server1) with VirtualHost ones. Any accessible area on your web namespace should be configured via VirtualHost. (The first one in your configuration becomming "default" in that case.)
Using VirtualHosts on both servers is not a problem by itself. You just need to ensure the ServerName from the original HTTP request is correctly being forwarded and arriving at server2. For this you need to add
ProxyPreserveHost On
to your VirtualHost configurations.
It might, however, be easier to give up the name based VirtualHosts usage with server2 and turn to using different ip address or ports for the individual (logical) hosts. Server2 is (at least by concept) an internal setting and not visible to the "external" side. Thus, ease of use is not truly attributable