subdomains

[Patrick Ben Koetter]

Hi Marc,

* Marc Patermann <hans.moser at ofd-z.niedersachsen.de>:
> I have a lot of subdomains.

I know you have many. :)

> As far as I understand I need to have an autoconfig entry in DNS for
> every subdomain.
> 

Before I begin:

Mozilla Schema   == autoconfig...
Microsoft Schema == autodiscover...

> autoconfig.foo.example.com.       IN    A     192.168.2.1

For TB you need an either an A Record in your subdomain OR a CNAME.

> autodiscover.bar.example.com.     IN    A     192.168.2.1

For MS you need either an A Record OR you add a SRV record that redirects the
client to a single A Record. We definitely recommend using a SRV record because
it will safe you a lot of money when buying certificates - unless you use a
wildcard cert. Be aware though that when you redirect clients will issue a
notification which might irritate your customers.


> Do I really need to configure every subdomain in the virtualhost in
> Apache, too?
> 
> <VirtualHost *:80>
> 
>   ServerName example.com
>   ServerAlias autoconfig.foo.example.com
>   ServerAlias autoconfig.bar.example.com

No. You can use a wildcard virtual host. The following example was taken from
<https://developer.mozilla.org/en/Thunderbird/Autoconfiguration>:

<VirtualHost *:80> #Must be the first Virtual host
        ServerAdmin webmaster at ofd-z.niedersachsen.de
        ServerName www
        DocumentRoot /var/www
        RewriteEngine On
        RewriteCond %{HTTP_HOST} ^autoconfig\. [NC]
        RewriteRule ^/(.*)      http://autoconfig.ofd-z.niedersachsen.de/$1 [L,R=301,NE]
        #...
</VirtualHost>

<VirtualHost *:80>
    DocumentRoot /var/www/autoconfig/
    ServerName autoconfig.ofd-z.niedersachsen.de
    <Directory /var/www/autoconfig>
        Order allow,deny
        allow from all
    </Directory>
</VirtualHost>


> I think the HTTP HOST header is not involved anyway, or is it?
> So if the webserver at IP 192.168.2.1 is solely for automx, there is
> no need for all the names, is it?

>From my - limited - understanding with webservers, yes. They will all hit the
default server and it will serve if it can.

HTH

p at rick

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