Create a new document in the apache config folder with the name of your site you want to link.
sudo nano /etc/apache2/sites-available/mysite.conf
Add the follwing content to the file
<VirtualHost *:80>
ServerName mysite.com
DocumentRoot /var/www/mysite/
<Directory />
Options FollowSymLinks
AllowOverride All
</Directory>
<Directory /var/www/mysite/>
Options FollowSymLinks MultiViews
AllowOverride All
Order allow,deny
allow from all
</Directory>
</VirtualHost>
Enable this new virtual host with the following command. Change it to your filename.
sudo a2ensite mysite.conf
Now we need to restart the apache server.
sudo service apache restart