This is a bad idea. Ruby application servers like unicorn
benefit from a general purpose web server like Apache
or nginx
being used a front-end, but using a Tomcat
Java application server as a front-end adds extra complexity with much benefit.
That being said, you can configure the embedded Apache instance within Tomcat
as a reverse proxy to serve traffic from a unicorn
app server:
# Assuming unicorn running locally on port 8081:
ProxyPassReverse / http://localhost:8081/