To stop your web server, type:
$ sudo systemctl stop nginx
To start the web server when it is stopped, type:
$ sudo systemctl start nginx
To stop and then start the service again, type
$ sudo systemctl restart nginx
If you are simply making configuration changes, Nginx can often reload without dropping connections. To do this, type:
$ sudo systemctl reload nginx
By default, Nginx is configured to start automatically when the server boots. If this is not what you want, you can disable this behavior by typing:
$ sudo systemctl disable nginx
To re-enable the service to start up at boot, you can type:
$ sudo systemctl enable nginx