Why is the ea-nginx service listening on port 80?
Previously the ea-nginx service would enter a 'standalone' mode and proxy as necessary to other services such as Apache and PHP-FPM. Now the ea-nginx service automatically enters a reverse proxy mode with caching, where all requests will be forwarded to Apache for processing.
Achieving the previous behavior would require installing the ea-nginx-standalone package:
yum install ea-nginx-standalone
It is important to remember the ea-nginx packages are experimental and are intended for administrators with an advanced understanding of NGINX.