gem install passenger
passenger-install-nginx-module 1. Yes: download, compile and install Nginx for me. (recommended) Please specify a prefix directory [/opt/nginx]: /opt/nginx
vi /opt/nginx/conf/nginx.conf
server {
listen 80;
server_name localhost;
root /xx/xx/rails_app/public;
passenger_enabled on;
rails_env production;
}
/opt/nginx/sbin/nginx /opt/nginx/sbin/nginx -s quit