@CrypticCube

By default, the app.yml file for Discourse binds Port 80, or attempts to. Since you already have port 80 bound due to Apache, you’d need to modify app.yml, bind Discourse to an alternate port, and then proxy requests on Port 80 to Discourse (to keep the new port out of the URL).

https://meta.discourse.org/t/advanced-setup-and-administration/15929

The above provides configuration for NGINX only, however, so you would need to set up proxying for Apache if you don’t want to use NGINX.