touch /etc/apache2/sites-available/packages.conf
vim /etc/apache2/sites-available/packages.conf
Listen 81
<VirtualHost *:81>
ServerAdmin webmaster@localhost
DocumentRoot /mnt/ramdisk
<Directory />
Options FollowSymLinks
AllowOverride None
</Directory>
ErrorLog /var/log/apache2/error.log
# Possible values include: debug, info, notice, warn, error, crit,
# alert, emerg.
LogLevel warn
CustomLog /var/log/apache2/access.log combined
</VirtualHost>
ln -s /etc/apache2/sites-available/packages.conf /etc/apache2/sites-enabled
vim /etc/apache2/apache2.conf
...
<Directory /mnt>
Options Indexes FollowSymLinks
AllowOverride None
Require all granted
</Directory>
...
service apache2 restart