server {
        listen 80;
        root /var/www/html/root;
        server_name mydomain.ru;
        access_log /var/log/nginx/access.mydomain.ru.log;
        error_log /var/log/nginx/error.mydomain.ru.log;
        location / {
                return 301 $scheme://blog.mydomain.ru$request_uri;
        }
}