Including Files In Nginx
Nginx has the include directive that can include the contents of a configuration file where it is run. This can be very useful for things like common fastcgi_pass directives or SSL configuration.
Extracting common configuration snippets into their own configuration allows you to, as an example, maintain your SSL ciphers and HSTS settings in a single place for all of the projects on the system.
As another example, you can upgrade all your PHP websites to the next version of PHP seamlessly. By updating a single file to point to the newer version and reloading nginx, you will not face any downtime during the upgrade and no projects were missed.
nginx.conf
server {
server_name example.com www.example.com *.example.com example.co www.example.co *.example.co;
root /var/www/example.com/www/html;
include ssl.conf;
include php.conf;
include general.conf;
ssl_certificate /etc/letsencrypt/live/example.com/fullchain.pem;
ssl_certificate_key /etc/letsencrypt/live/example.com/privkey.pem;
}