Let's Encrypt for Nginx

default.conf

# /etc/nginx/conf.d/default.conf
# This config is generated as a reference, from 
# https://mozilla.github.io/server-side-tls/ssl-config-generator/?server=nginx-1.12.1&openssl=1.1.0f&hsts=no&profile=modern 
# Remember to replace <HOSTNAME> if you use this directly.
# Or generate your own config.

server {
  listen 443 ssl http2;
  listen [::]:443 ssl http2;

  server_name <HOSTNAME>;

  # certs sent to the client in SERVER HELLO are concatenated in ssl_certificate
  ssl_certificate /etc/letsencrypt/live/<HOSTNAME>/fullchain.pem;
  ssl_certificate_key /etc/letsencrypt/live/<HOSTNAME>/privkey.pem;
  ssl_session_timeout 1d;
  ssl_session_cache shared:SSL:50m;
  ssl_session_tickets off;


  # modern configuration. tweak to your needs.
  ssl_protocols TLSv1.2;
  ssl_ciphers 'ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-SHA384:ECDHE-RSA-AES256-SHA384:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA256';
  ssl_prefer_server_ciphers on;


  # OCSP Stapling ---
  # fetch OCSP records from URL in ssl_certificate and cache them
  ssl_stapling on;
  ssl_stapling_verify on;

  ## verify chain of trust of OCSP response using Root CA and Intermediate certs
  ssl_trusted_certificate /etc/ssl/certs/ca-certificates.crt;

  #resolver <IP DNS resolver>;

  #location /{
  #  ...
  #}
}

http.conf

#/etc/nginx/conf.d/http.conf

server {
  listen 80 default_server;
  listen [::]:80 default_server;

  include letsencrypt.conf;
  # Redirect all HTTP requests to HTTPS with a 301 Moved Permanently response.
  location /{
    return 301 https://$host$request_uri;
  }
}

letsencrypt.conf

  #/etc/nginx/letsencrypt.conf
  
  # Use this command to generate a certification:
  # certbot certonly --webroot --agree-tos -m email@example.com -w /var/lib/letsencrypt/ -d hostname.example.com 
  
  # Accept let's encrypt challenges
  # Create folder /var/lib/letsencrypt before use
  location /.well-known {
    allow all;
    root /var/lib/letsencrypt/;
    default_type "text/plain";
    try_files $uri =404;
  }