nginx_recipe

upstream unicorn {
  server unix:/tmp/unicorn.my_app.sock fail_timeout=0;
}

server {
  server_name my_app.com www.my_app.com;
  listen 80 default deferred;
  
  root /home/deployer/webapps/node/my_app/public;
  
  try_files $uri/system/maintenance.html $uri/index.html $uri @unicorn;
  
  location @unicorn {
    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    proxy_set_header X-Forwarded-Proto $scheme;
    proxy_set_header Host $http_host;
    proxy_redirect off;
    proxy_pass http://unicorn;
  }
  
  location ^~ /assets/ {
    gzip_static on;
    expires max;
    add_header Cache-Control public;
    add_header Access-Control-Allow-Origin *;
  }
  
  error_page 500 502 503 504 /500.html;
  client_max_body_size 4G;
  keepalive_timeout 10;
}

ubuntu_recipe

sudo apt-get update
sudo apt-get upgrade (i guess this is corrupting postgresql installation)
sudo apt-get install curl vim build-essential python-software-properties git-core
sudo apt-get install imagemagick libmagickwand-dev

addgroup admin
adduser deployer --ingroup admin

deployer:
sudo add-apt-repository ppa:nginx/stable
sudo apt-get update
sudo apt-get install nginx
sudo service nginx start

sudo mkdir /home/deployer/webapps/node
sudo chgrp -R admin /home/deployer/webapps/node
sudo chmod -R g+rwxs /home/deployer/webapps/node
mkdir /home/deployer/webapps/node/my_app

sudo nano /etc/nginx/sites-available/my_app

(add nginx server configuration here, follow nginx_recipe)

sudo ln -s /etc/nginx/sites-available/my_app /etc/nginx/sites-enabled/my_app
sudo rm /etc/nginx/sites-enabled/default
sudo service nginx restart

(if there are issues regarding nginx start, you can check these with "tail -f /var/log/nginx/error.log" or "$ cat /var/log/nginx/error.log". Maybe you should/must, in /etc/nginx/nginx.conf, to uncomment "server_names_hash" section(s) and set it to 256)