install-nginx-ubuntu

#update packages
sudo apt-get update

#install nginx
sudo apt-get install nginx

#configure
sudo vi /etc/nginx/sites-available/default

#if you have a custom domain replace example.com with your domain 
server {
    listen 80;
    server_name example.com;
    location / {
        proxy_pass http://APP_PRIVATE_IP_ADDRESS:8080;
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection 'upgrade';
        proxy_set_header Host $host;
        proxy_cache_bypass $http_upgrade;
    }
}

#restart nginx
service nginx restart