Redirect all non-www subdomains to main www domain with Apache2

Question

I have a website (domain.com) and I would like to redirect all my secondary domains (domain2.com, domain3.com) and all the subdomains of these domains (*.domain.com, *.domain2.com...) to the main domain, www.domain.com (because I want the latter to be the only URL to gain access to the site).

For this purpose, I have created an Apache Virtual Host to catch all these possibilities and redirect them (after having configured my DNS, that goes without saying). I put this configuration in a file named "999-catchall" in the folder "sites-enabled" of Apache. NB : I use this name to be sure that it will be the last vhost checked, because I have also my default vhost (000-default for www.domain.com) and a vhost for my webmail (001-webmail for webmail.domain.com).

Here is the content of this "999-catchall" file:

<VirtualHost *:80>
        # catch...
        ServerName domain.com
        ServerAlias domain2.com domain3.com *.domain.com *.domain2.com *.domain3.com
        # ...and redirect
        RewriteEngine on
        RewriteCond %{HTTP_HOST} !^www\.domain\.com$ [NC]
        RewriteRule ^(.*)$ http://www.domain.com$1 [R=301,L]
</VirtualHost>

This configuration works for domain.com, domain2.com, *.domain2.com, domain3.com and *.domain3.com but not for *.domain.com. Example : If I type blabla.domain2.com, I'm redirected to www.domain.com, but if I type blaba.domain.com, I'm not (I just have a "Server not found" error).

Is my method correct? Do you see where my mistake is?

EDIT : My mistake, my DNS server wasn't configured properly for *.domain.com. So this configuration works, if it can help someone who would want to do the same thing.

Solution

I'm no Apache expert, but have considered changing:

ServerName www.domain.com
ServerAlias domain.com domain2.com domain3.com *.domain.com *.domain2.com *.domain3.com

edit: On rereading the OP, it looks like you're already configuring www.domain.com in a different file, which I don't believe is allowed. That, however, may be part of the problem. If I'm following you correctly, the www.domain.com response is from that file, not the config posted here.

Comments

[Admin]

That's what I thought too, but if it was the case (if blabla.domain.com was caught by another vhost), it should render something and not "Server not found", no?

[TKguru42]

Yes, I'm configuring www.domain.com in another file (000-default). Why isn't it allowed? and what is the good pratice? I'm a bit lost...

[David]

wget result : Resolving blabla.domain.com... failed:: No address associated with nodename. wget: unable to resolve host address `blabla.domain.com'

[David]

... OK this result made me realize that it could be a DNS misconfiguration. Actually, it is the case. I hadn't specified a DNS entry for *.domain.com! My "after having configured my DNS, that goes without saying" was a bit presomptuous! I will wait for the DNS to propagate before celebrating, but it seems that the error comes from this. Sorry for the disturbing.