服务器怎么屏蔽域名

# 屏蔽特定域名
iptables -A INPUT -p tcp --dport 80 -m string --string "example.com" --algo bm -j DROP
iptables -A INPUT -p tcp --dport 443 -m string --string "example.com" --algo bm -j DROP

# 屏蔽特定域名
firewall-cmd --permanent --add-rich-rule='rule family="ipv4" source address="0.0.0.0/0" port port="80" protocol="tcp" reject'
firewall-cmd --permanent --add-rich-rule='rule family="ipv4" source address="0.0.0.0/0" port port="443" protocol="tcp" reject'
firewall-cmd --reload

server {
    listen 80;
    server_name yourdomain.com;

    location / {
        if ($host = "example.com") {
            return 403;
        }
        proxy_pass http://backend_server;
    }
}

<VirtualHost *:80>
    ServerName yourdomain.com

    <Location />
        ProxyPass http://backend_server
        ProxyPassReverse http://backend_server
        RewriteEngine On
        RewriteCond %{HTTP_HOST} ^example\.com$ [NC]
        RewriteRule ^ - [F]
    </Location>
</VirtualHost>