how-to-setup-apache-virtual-hosts-on-ubuntu

 Just follow the below steps:  
 1. Open the terminal.  
 2. sudo –i  
 3. cp /etc/apache2/sites-available/000-default.conf /etc/apache2/sites-available/test.mydomain.com.conf  
 4. gedit /etc/apache2/sites-available/test.mydomain.com.conf  
       Change DocumentRoot /var/www/html/test.mydomain.com  
       Add these lines:  
           ServerName test.mydomain.com  
           ServerAlias www. test.mydomain.com  
 5. a2ensite test.mydomain.com.conf  
 6. sudo service apache2 restart  
 7. apache2ctl -S  
         //will display list of host to your system  
 8. sudo gedit /etc/hosts  
       //Add your host name like  
         127.0.1.1  test.mydomain.com