WordPress Apache ProxyPass

Option 1

Ensure certain traffic goes to a certain server, you can use this:

Option 2

Step One: Configure Environment

We need to setup some environment variables to get this to work correctly.
Add the following to your environment on the slave server(s):

RHEL/CentOS: /etc/sysconfig/httpd

Ubuntu: /etc/apache2/envvars

Step Two: Configure your VirtualHost

In your VirtualHost configuration do something like the following.