You can try as follows:
Code:
$HTTP["host"] =~ "(^|\.)mydomain\.info$" {
server.document-root = "/home/mydomain/www"
server.errorlog = "/var/log/lighttpd/mydomain.info/error.log"
accesslog.filename = "/var/log/lighttpd/mydomain.info/access.log"
}
$HTTP["host"] =~ "(^|\.)forums\.mydomain\.info$" {
server.document-root = "/home/mydomain/subdomains/forums"
server.errorlog = "/var/log/lighttpd/forums.mydomain.info/error.log"
accesslog.filename = "/var/log/lighttpd/forums.mydomain.info/access.log"
}
Let me know if you have any further issues...