As Dyn.org announced that they would soon stop the free service, I had to move to a new address with this little WordPress-Site.
I ended up with SPDNS and I'm very happy with it. But while moving I had two problems:
The Apache Web Server offers the possibility to run multiple web-sites with different hosts simultaneously. The pages www.MeineSeite.de and www.Beispiel.de can therefore run on the same server and Apache. A requirement for this is that every host is connected to a virtual host in Apache.
On Linux (Debian/Ubuntu) virtual hosts are defined in the directory /etc/apache2/sites-available/. By default there is already one file named default created for one virtual host. It might look like this.