nginx 配置多个二级域名

    server {
        server_name
            domain.com
            www.domain.com
            *.domain.com
        ;

        set $subdomain '';
        if ($host ~* (\b(?!www\b).+)\.domain.com) {
            set $subdomain -$;
        }

        root    /home/user/www$subdomain/;
    }