lets_encrypt_nginx_config_for_rails.conf

####   An example config for a Rails application running with nginx and passenger server on Ubuntu 16.04/18.04. ####
####   Assuming you're going to use letsencrypt for SSL certificate.        ####

#1. Replace these or adjust the directory names as needed. This configuration assumes that the project file (rails_app) is located in '/home/username' directory.
## example.com = your domain name
## rails_app = your application directory
## username = server username

#2. weak DH parameter fix :
## sudo openssl dhparam -out /etc/nginx/dhparams.pem 2048 # for ssl_dhparam

#3. After setting up the config (only first part - to validate the domain first)
## cert generation command :
#### sudo certbot certonly --webroot -w /home/username/rails_app/public -d example.com -d www.example.com

## Note : append --dry-run to certbot command if you want to check whether setup is correct and you're not getting any error, without exhausting your limit.



## ---------------- nginx config begins here ---------------------##

## First part - add only this server block to validate domain and generate the certificate from LetsEncrypt
## After the certificate is generated you can updated nginx config to add all the blocks below.
# redirect http to https
server {
  listen 80;
  listen [::]:80; #IPv6
  server_name example.com, www.example.com;
  location / {
    return 301 https://$host$request_uri;
  }
  location /.well-known {
    root /home/username/ssl_acme;
  }
}


# redirect www to non-www
server {
  listen 443 ssl;
  listen [::]:443 ssl;
  server_name www.example.com;

  ssl_certificate /etc/letsencrypt/live/example.com/fullchain.pem;
  ssl_certificate_key /etc/letsencrypt/live/example.com/privkey.pem;
  ssl_session_tickets off;

  return 301 https://example.com$request_uri;
}


server {
  listen 443 ssl;
  listen [::]:443 ssl;
  server_name example.com;

  ssl on;
  ssl_certificate /etc/letsencrypt/live/example.com/fullchain.pem;
  ssl_certificate_key /etc/letsencrypt/live/example.com/privkey.pem;
  ssl_session_timeout 5m;
  ssl_session_cache shared:SSL:50m;
  ssl_session_tickets off;

  ssl_protocols TLSv1 TLSv1.1 TLSv1.2;
  ssl_ciphers 'ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:DHE-RSA-AES128-GCM-SHA256:DHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA256:ECDHE-ECDSA-AES128-SHA:ECDHE-RSA-AES256-SHA384:ECDHE-RSA-AES128-SHA:ECDHE-ECDSA-AES256-SHA384:ECDHE-ECDSA-AES256-SHA:ECDHE-RSA-AES256-SHA:DHE-RSA-AES128-SHA256:DHE-RSA-AES128-SHA:DHE-RSA-AES256-SHA256:DHE-RSA-AES256-SHA:ECDHE-ECDSA-DES-CBC3-SHA:ECDHE-RSA-DES-CBC3-SHA:EDH-RSA-DES-CBC3-SHA:AES128-GCM-SHA256:AES256-GCM-SHA384:AES128-SHA256:AES256-SHA256:AES128-SHA:AES256-SHA:DES-CBC3-SHA:!DSS';
  ssl_prefer_server_ciphers on;
  ssl_dhparam /etc/nginx/dhparams.pem;
  add_header Strict-Transport-Security max-age=15768000;


  passenger_enabled on;
  rails_env production;
  root /home/username/rails_app/current/public;

   # Cache static content
  location ~* \.(?:ico|css|js|gif|jpe?g|png)$ {
    expires 10d;
    add_header Vary Accept-Encoding;
    access_log off;
  }

}

## ---------------- nginx config ends here ---------------------##