How to configure subdomains for Apache2 on Ubuntu?

Question

I followed these instructions to configure subdomains for apache. I can access the subdomain using http://localhost/test though I cannot access it via http://test.localhost. How can I realize the latter?

# /etc/apache2/sites-available/test.localhost
<VirtualHost *:80>

    # Server name
    ServerName test.localhost

    # Document root
    DocumentRoot /var/www/test/

    # Custom log file locations
    ErrorLog  /var/www/test/logs/error.log
    CustomLog /var/www/test/logs/access.log combined

</VirtualHost>

Answer 1

As Mark B already answered correctly the problem was a misconfiguration in /etc/hosts. The correct configuration is:

# /etc/hosts
127.0.0.1     test.localhost

Answer 2

The blog post you linked to (from my blog) instructs to set up a new VirtualHost element with an ip of 127.0.0.2 so you can create multiple subdomains easily.

You're setup using 127.0.0.1 will work great for one subdomain, but if you plan on adding more, I'd suggest setting up the new VirtualHost elements as described in the post.