var $live_site = '';
var $log_path = '/home/username/public_html/joomla/logs';
var $tmp_path = '/home/username/public_html/joomla/tmp';
var $ftp_root = 'public_html/joomla';

var $live_site = '';
var $log_path = '/home/username/public_html/logs';
var $tmp_path = '/home/username/public_html/tmp';
var $ftp_root = 'public_html';

User-agent: *
Disallow: /joomla/administrator/
Disallow: /joomla/bin/
Disallow: /joomla/cache/
Disallow: /joomla/cli/
Disallow: /joomla/components/
Disallow: /joomla/includes/
Disallow: /joomla/installation/
Disallow: /joomla/language/
Disallow: /joomla/layouts/
Disallow: /joomla/libraries/
Disallow: /joomla/logs/
Disallow: /joomla/modules/
Disallow: /joomla/plugins/
Disallow: /joomla/tmp/

/etc/apache2/sites-enabled/000-default.conf

ServerAdmin webmaster@localhost
DocumentRoot /var/www/subfolder