<VirtualHost *:21>
    ServerName 2.2.2.2
    ErrorLog /var/log/httpd/ftp_error.log
    CustomLog /var/log/httpd/ftp_requests.log combined
    LogLevel debug
    ProxyPass / ftp://2.2.2.2:21/
    ProxyPassReverse / ftp://2.2.2.2:21/
</VirtualHost>