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I have an Apache2 configuration with multiple VirtualHosts. My DNS is set to accept *.<domain>.<tld> on multiple domains. Everything is working correctly but if I go to something-random-here.example.com I seem to get an invalid VirtualHost being selected (I am guessing the first or last one it finds). Is there a way to tell Apache to use certain rules if none of the VirtualHost entries match the domain or subdomain? I'd preferably like to return a 404.

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up vote 6 down vote accepted

Apache uses the first virtualhost if no name matches. Just configure a new virtualhost as the first one with a random name, displaying whatever you like - or returning a 404 page.

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Thanks but could you please elaborate? I can't get this to work. – Ryall Sep 7 '11 at 12:34
2  
How are your apache2 configuration files layed out? Or which operating system do you use? Apache reads the configuration in a certain order, and the first VirtualHost it sees is the default one. It receives all traffic from unknown host names. So if you have a single configuration file, the first VirtualHost is it. If you have multiple ones, like on most linuxes, it may be the one called 0default or so... – Moritz Both Sep 7 '11 at 15:00
    
I put some default configurations in the ports.conf. It wasn't working because I tried to match *:80 when I was using <ip>:80 on my virtualhosts. Instead I had to create a separate default entry for each IP and it works now. – Ryall Sep 8 '11 at 15:31

Wildcard include your site configuration files:

Include path/to/site/confs/*httpd.conf

Organize your site conf files so they are loaded in an expected order. Example...

01-httpd.conf

02-site1-httpd.conf

03-site2-httpd.conf

etc...

Apache will read these in order. Then create one that will always load last to catch any unmatched virtual hosts and return a 404 instead of loading a default site.

99-catchall-httpd.conf

<VirtualHost *:8080>
 ServerName null
 ServerAlias *
 Redirect 404 /
</VirtualHost>

<VirtualHost *:8443>
 ServerName null
 ServerAlias *
 Redirect 404 /
</VirtualHost>

Be sure to replace the ports with whatever ports your httpd listens on. Or if you have httpd listening on specific interfaces, you'll need to add a catchall for each interface instead, like so:

<VirtualHost 192.168.1.101:8080>
 ServerName null
 ServerAlias *
 Redirect 404 /
</VirtualHost>
<VirtualHost 192.168.1.101:8443>
 ServerName null
 ServerAlias *
 Redirect 404 /
</VirtualHost>

<VirtualHost 192.168.1.102:8080>
 ServerName null
 ServerAlias *
 Redirect 404 /
</VirtualHost>

<VirtualHost 192.168.1.102:8443>
 ServerName null
 ServerAlias *
 Redirect 404 /
</VirtualHost>

Hope this helps. I use this method to load sites in the order I specify and prevent unmatched virtual hosts from loading an unexpected site unintentionally.

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