Apache 提供“It works”页面而不是网站的主页

我的网站www.domainname.com加载 apache2 'It works' 页面，而不是预期的 moode 主页，该主页位于/var/www/html/moodle. 在moodle目录中有一个索引文件index.php，但默认不使用。如果我去www.domainname.com/moodle网站主页来。配置文件/etc/apache2/sites-available/domainname.conf已启用。如何解决这个问题？

<VirtualHost *:80>
    # The ServerName directive sets the request scheme, hostname and port that
    # the server uses to identify itself. This is used when creating
    # redirection URLs. In the context of virtual hosts, the ServerName
    # specifies what hostname must appear in the request's Host: header to
    # match this virtual host. For the default virtual host (this file) this
    # value is not decisive as it is used as a last resort host regardless.
    # However, you must set it for any further virtual host explicitly.
    ServerName www.domainname.com
    ServerAlias domainname.com

    ServerAdmin webmaster@localhost
    DocumentRoot /var/www/html/moodle
    DirectoryIndex "index.php"
    # <Directory /var/www/html/>
    #       AllowOverride All
    # </Directory>  

    # Available loglevels: trace8, ..., trace1, debug, info, notice, warn,
    # error, crit, alert, emerg.
    # It is also possible to configure the loglevel for particular
    # modules, e.g.
    #LogLevel info ssl:warn

    ErrorLog ${APACHE_LOG_DIR}/error.log
    CustomLog ${APACHE_LOG_DIR}/access.log combined

    # For most configuration files from conf-available/, which are
    # enabled or disabled at a global level, it is possible to
    # include a line for only one particular virtual host. For example the
    # following line enables the CGI configuration for this host only
    # after it has been globally disabled with "a2disconf".
    #Include conf-available/serve-cgi-bin.conf
 RewriteEngine on
 RewriteCond %{SERVER_NAME} =www.domainname.com
 RewriteRule ^ https://%{SERVER_NAME}%{REQUEST_URI} [END,NE,R=permanent]
</VirtualHost>

 # vim: syntax=apache ts=4 sw=4 sts=4 sr noet