NameVirtualHost *:80

<VirtualHost *:80>
    ServerName site1.com
    DocumentRoot /var/www/site1.com/
    ErrorLog /var/log/apache2/site1-error.log
    CustomLog /var/log/apache2/site1-access.log combined
</VirtualHost>

<VirtualHost *:80>
    ServerName site2.com
    DocumentRoot /var/www/site2.com/
    ErrorLog /var/log/apache2/site2-error.log
    CustomLog /var/log/apache2/site2-access.log combined
</VirtualHost>