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If you're using domain names with virtual hosts, then this will only work if you set 
up networking such that the domain name referenced in the file resolves to the IP 
address of your server. Depending on your configuration, there are multiple ways to 
do this. If you're using a VPS provider, such as DigitalOcean or Linode, your server 
will have an IP address already and you only need to edit the 
A Record
 on your DNS 
server to point to that IP. (The various types of DNS entries, such as an A Record, 
were covered in 
Chapter 11
, 
Setting Up Network Services
.) If you're running your own 
DNS server, you would add the A Record there. If you're using an external DNS 
provider, you would log in to the dashboard for your account and add the A Record 
there. For testing purposes, you can edit your 
/etc/hosts
 file to point to your new 
web server. If you're not using a VPS provider, you would need to forward port 
80
 
in your firewall to point to your internal 
web server. This is beyond the scope of this 
book, as there are many different models of firewalls available and it's impossible to 
cover them all.
As we continue through this chapter, we'll perform some additional configuration 
for Apache. At this point though, you should have an understanding of the basics 
of how Apache is configured in Ubuntu Server. For extra practice, feel free to create 
additional virtual hosts and serve different pages for them.