如何在一个域名下设置多个网站的nginx？

http {
    ...
    server {
        listen 80;
        server_name example.com;
        root /var/www/example.com;
        index index.html;

        location / {
            try_files $uri $uri/ =404;
        }
    }

    server {
        listen 80;
        server_name subdomain.example.com;
        root /var/www/subdomain.example.com;
        index index.html;

        location / {
            try_files $uri $uri/ =404;
        }
    }
    ...
}

sudo mkdir /var/www/example.com
sudo mkdir /var/www/subdomain.example.com

sudo service nginx restart