How to check my system configuration?

?

The only one that would know the internal configuration of your Linode would be someone with access to the Linode itself. Linode doesn't have access to our customers' internals, which is why the Cloud Manager wouldn't report this.

The following section in our Beginner's Guide might be helpful for you:
Linode Beginner's Guide - Does my Linode have a control panel?

Otherwise, if you could clarify what aspects of your configuration you're looking to learn more about, I'd be happy to try to provide some more specific steps on how to identify them.