Generate standalone SSL certs with certbot (nginx)

README.md

Install certbot from repo

$ sudo apt install certbot python3-certbot-nginx

Generate secret dhparam.pem

$ cd /etc/ssl

$ sudo openssl dhparam -out dhparam.pem 4096

Generate standalone certs

$ sudo service nginx stop

$ sudo certbot certonly --noninteractive --agree-tos --standalone --email [email protected] -d example.com -d www.example.com

$ sudo service nginx start

service.conf

server {
    listen 80;
    listen [::]:80;
    server_name example.com www.example.com;
    return 301 https://example.com$request_uri;
}

server {
  listen 443 ssl default_server;
  listen [::]:443 ssl default_server;
  http2 on;
  
  server_name example.com www.example.com;

  client_body_buffer_size 256K;
  client_header_buffer_size 256K;
  client_max_body_size 2m;
  large_client_header_buffers 2 256K;

  gzip on;
  gzip_disable "msie6";
  gzip_vary on;
  gzip_types text/plain text/css application/json application/x-javascript text/xml application/xml application/xml+rss text/javascript application/javascript;

  keepalive_timeout 60;

  server_tokens off;

  ssl_protocols TLSv1.2 TLSv1.3;
  ssl_ciphers "EECDH+AESGCM:EDH+AESGCM:ECDHE-RSA-AES128-GCM-SHA256:AES256+EECDH:DHE-RSA-AES128-GCM-SHA256:AES256+EDH:ECDHE-RSA-AES256-GCM-SHA384:DHE-RSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-SHA384:ECDHE-RSA-AES128-SHA256:ECDHE-RSA-AES256-SHA:ECDHE-RSA-AES128-SHA:DHE-RSA-AES256-SHA256:DHE-RSA-AES128-SHA256:DHE-RSA-AES256-SHA:DHE-RSA-AES128-SHA:ECDHE-RSA-DES-CBC3-SHA:EDH-RSA-DES-CBC3-SHA:AES256-GCM-SHA384:AES128-GCM-SHA256:AES256-SHA256:AES128-SHA256:AES256-SHA:AES128-SHA:DES-CBC3-SHA:HIGH:!aNULL:!eNULL:!EXPORT:!DES:!MD5:!PSK:!RC4";
  ssl_prefer_server_ciphers on;
  ssl_session_cache shared:SSL:10m;
  ssl_session_timeout 1d;
  ssl_session_tickets off;
  ssl_dhparam /etc/ssl/dhparam.pem;
  ssl_certificate /etc/letsencrypt/live/example.com/fullchain.pem;
  ssl_certificate_key /etc/letsencrypt/live/example.com/privkey.pem;

  add_header Strict-Transport-Security 'max-age=31536000; includeSubDomains' always;

  root /home/ubuntu/site;
  index index.html;

  location / {
    add_header X-Frame-Options SAMEORIGIN;
    add_header X-Content-Type-Options "nosniff" always;
    add_header X-XSS-Protection "1; mode=block";
  
    try_files $uri $uri/ /index.html =404;
  }

  location ~* \.(?:jpg|jpeg|gif|png|ico|cur|gz|svg|svgz|mp4|ogg|ogv|webm|htc)$ {
    expires 1M;
    access_log off;
    add_header Cache-Control "public";
  }

  location ~* \.(?:css|js)$ {
    try_files $uri =404;
    expires 1y;
    access_log off;
    add_header Cache-Control "public";
  }

  location ~ ^.+\..+$ {
    try_files $uri =404;
  }

  access_log /var/log/nginx/example.access.log;
  error_log /var/log/nginx/example.error.log;
}