I've already posted this in the VM forum, but didn't get any replies. Scott Grayban personally told me that this might be a bug that has been introduced with on of the recent VM upgrades.
Something really got messed up with creating sub-servers in my VM Pro installation!
I haven't changed the server templates or anything else and the sub-server/sub-domain use the (modified) default server templates anyway, so I don't know why this behaves differently now than a couple of weeks ago.
I just created a new server magento-webshop.ch and afterwards created the sub-domain demo.magento-webshop.ch which resulted in this file tree:
# tree -L 3
.
|-- awstats
|-- base
|-- cgi-bin
| |-- awstats.pl
| |-- demo
| | |-- php4.cgi
| | `-- php5.cgi
| |-- lang -> /usr/share/awstats/lang/lang
| |-- lib -> /usr/share/awstats/lib/lib
| |-- php4.cgi
| |-- php5.cgi
| `-- plugins -> /usr/share/awstats/plugins/plugins
|-- domains
| `-- demo.magento-webshop.ch
| |-- base
| |-- cgi-bin
| |-- domains
| |-- errors
| |-- etc
| |-- ftp
| |-- homes
| |-- htdocs
| |-- logs
| |-- perl
| |-- ssl
| `-- tmp
|-- etc
| |-- dav.digest.passwd
| |-- php.ini -> php4/php.ini
| |-- php4
| | `-- php.ini
| `-- php5
| `-- php.ini
|-- ftp
|-- homes
|-- htdocs
| |-- awstats-icon -> /usr/share/awstats/icon
| |-- demo
| |-- errors -> ../errors
| `-- icon -> /usr/share/awstats/icon
|-- logs
| |-- access_log
| `-- error_log
|-- mail
|-- perl
|-- ssl
`-- tmp
The first part of the sub domain's apache config looks like this:
ServerName demo.magento-webshop.ch
ServerAlias www.demo.magento-webshop.ch
DocumentRoot /var/www/virtual/magento-webshop.ch/htdocs/demo
ErrorLog /var/www/virtual/magento-webshop.ch/logs/error_log
CustomLog /var/www/virtual/magento-webshop.ch/logs/access_log combined
ScriptAlias /cgi-bin/ /var/www/virtual/magento-webshop.ch/cgi-bin/demo/
DirectoryIndex index.html index.htm index.php index.php4 index.php5
whereas the DocumentRoot should actually be /var/www/virtual/magento-webshop.ch/domains/demo.magento-webshop.ch/htdocs/
Strangely enough, VM creates two different directories
/var/www/virtual/magento-webshop.ch/domains/demo.magento-webshop.ch/htdocs/
and
/var/www/virtual/magento-webshop.ch/htdocs/demo
The latter path then goes into the Apache configuration, although nothing like that is specified in the template:
ServerName ${DOM}
ServerAlias www.${DOM}
DocumentRoot ${HOME}/htdocs
ErrorLog ${HOME}/logs/error_log
CustomLog ${HOME}/logs/access_log combined
ScriptAlias /cgi-bin/ ${HOME}/cgi-bin/
DirectoryIndex index.html index.htm index.php index.php4 index.php5
This has been working without any problems a couple of weeks ago.
P.S. The forum entry can be found here: http://www.virtualmin.com/forums/virtualmin/sub-domain-creation-got-mess...