Feb 02
Setting Up DNS Wildcards / ServerAlias in DirectAdmin
This is straight from their knowlege base, more for my own personal archive than anything else 
If you’d like to setup your domain to accept anything.domain.com, you can do so with the following guide (Admin access required)
1) Setup the dns with a wildcard A record. Go to Dns Control, and add an “A” record:
* -> 1.2.3.4
where 1.2.3.4 is the IP of your domain.
This will allow anything.domain.com to resolve to your server. Apache does not yet know how to direct that name though.
2) To setup apache, go to:
Admin Level -> Custom Httpd configurations -> domain.com
In the top text area, add this *one* line:
ServerAlias *.|DOMAIN|
then click “Save”.
That should be it. Wait a few minutes for everything (apache, named) to be restarted then test it out.
The wildcard subdomains will point to your main public_html directory for the domain.
If you want to change this, it’s probably best not to do step 2, and to setup your own custom virtualhost manually into the /etc/httpd/conf/httpd.conf (DA wont delete/overwrite it there) with the same ServerAlias directive as in step 2.
You can then use the mod_rewrite methods Brandon describes to have some real fun with those dynamic sub domains.
June 16th, 2008 at 1:05 am
Should the ‘ServerAlias *.|DOMAIN|’ go above or below ‘RewriteEngine On’?
June 16th, 2008 at 4:30 am
I don’t think it matters in what order it goes.
September 11th, 2008 at 8:30 am
[...] posted instructions in the past on how to set up wildcard DNS and subdomains on DirectAdmin. DirectAdmin makes it rather trivial, which is quite nice. There is a little bit more effort [...]