To host multiple sites on the same server, VirtualHost entries can be used in Apache to route the Web traffic to the proper files.
In this tutorial, we'll assume that the domain we are trying to add is
named "example.com". You'll want to replace "example.com" with the name of the domain that you are actually configuring.
First, a new directory for the domain should be created. It is recommended to create separate directories per domain under the main /var/www/ document root. That way, the files for sites won't reside under one another and potentially interfere with the settings for other sites. For this example, we'll create a sub-directory with the same name as the domain (the name can be anything you like so long as the Apache configuration is set the same).
The directory should also be changed to the username that you wish to administer it as, we'll be using "ubuntu" as the username:
sudo mkdir /var/www/example.com/
sudo chown ubuntu /var/www/example.com/
We'll now place a file in that directory to use for testing later:
echo "Hello world from example.com" > /var/www/example.com/index.html
We can now proceed with adding the VirtualHost entry into Apache to associate the example.com name with the content above. The default VirtualHost file can be copied to be used as a template:
sudo cp /etc/apache2/sites-available/000-default.conf /etc/apache2/sites-available/example.com.conf
That file can then be opened to be modified via "nano" or your favorite text editor on the server:
sudo nano /etc/apache2/sites-available/example.com.conf
The lines starting with # characters are just comments and don't change the configuration. They are just there as reference. The base changes you'll want to make are for these lines:
The first #ServerName line should have the # character removed, so that will become:
If you want the domain to respond to requests without the preceding 'www' on it as well, you can add a ServerAlias line under that line like:
For "ServerAdmin", that should be set to the email address you wish to have configured as the default Webmaster address, such as:
Finally, DocumentRoot should be set to the directory containing the files for the site. That is the directory we created above:
At this point, the file can be saved. You will then have an available site VirtualHost, but that still needs to be enabled in Apache. That can be done with:
sudo a2ensite example.com
The a2ensite command will link the configuration file made above into the live Apache configuration. To have Apache update to using that, the following command should be run:
sudo service apache2 reload
The new domain can now be tested in your browser. Going to
http://www.example.com should load the "Hello world from example.com" message entered into the index.html file earlier.
For more advanced setup of Apache, the following resources can be consulted.
Apache configuration documentation:
The Apache Getting Started Guide: