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Web Hosting and Cloud Computing Control Panels
When you create a Xen instance in Cloudmin, it expects you to just enter a name like "myvps" which is then used as the Xen instance name. The domain name that you set at Host Systems -> Xen Host Systems -> yourhost is then appended to get the fully qualified hostname.
Of course, once this is done you are free to register a DNS domain or add a DNS record separately like www.myvps.com and have it resolve to the IP of your new Xen instance. You can then change the hostname in Cloudmin, on the Edit System page.
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Thanks for explaining - but i still dont know why i cant use the FQDN straight away? There must be a reason why i'm 'forced' to use a subdomain of my Host system.
The reason you can't enter an arbitrary FQDN is that Cloudmin needs to create a DNS entry for that hostname to match the IP address it assigns for the Xen instance, and it can only do this for a hostname in the DNS domain that it controls.
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I must admit, this baffled me at first too, but the more I use it, the more I think it's not such a bad idea. I've had people come to me for a VPS before and had no idea what a hostname was or why they needed it and as such I had to manually provide them with one.