apache 2.2 - Multiple VirtualHosts files for subdomains in apache2

I'm new with apache2 and virtualHosts and all these things, I'm trying to set multiple subdomains, each in one file.

For example, I'll have

quentin-dommerc.com file in site-available :

              DocumentRoot /var/www/
              ServerName quentin-dommerc.com

and en.quentin-dommerc.com file in site-available :

              DocumentRoot /var/www/en/

              ServerName en.quentin-dommerc.com

But whatever the subdomain I go to, I'm always on quentin-dommerc.com :(

Note that I've a2ensite my files and they're well in site-enabled. I've also reloaded/restarted apache2. My CNAME are also set.

Answer

Try changing your VirtualHost entries to use your ip address instead of domain name. e.g. if you ip address is 1.1.1.1

          DocumentRoot /var/www/
          ServerName quentin-dommerc.com



          DocumentRoot /var/www/en/
          ServerName en.quentin-dommerc.com

You may also have to update your Listen lines to reflect using the ip address.