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In FIWARE Ecosystem, we differentiate between FIWARE Private and Public nodes in the following way:

Public nodes are ones in which they have shared the resources with the community and the identity of the users is distributed.
Private nodes are ones that do not share neither resources or identities but they can request us to provide the corresponding images that we are using or any other technology like the Cloud portal.

Giving that, any instance (public or private) is based in OpenStack distribution, therefore the only thing that you need is install from the scratch the current version of OpenStack with both OpenStack Keystone and OpenStack Horizon.

The documentation in https://forge.fiware.org/plugins/mediawiki/wiki/fiware/index.php/FIWARELabNodes_Handbook provide a good reference about all the installation process and help you in the decision to install the node.

If you do not plan to federate the identity it is not needed to use the FIWARE Keyrock, it is a security component used to provide authentication/authorization to the other FIWARE Services, not Cloud services. Therefore it it nos needed its installation.

Both if it is public or private node, we have a specific service to synchronize the images in the different nodes, in case of public the process is very easy due to the identity is federated. In case of private nodes, we need to know the IP address of your Keystone service and the credentials of a user in your instance in order that we can upload automatically the images in your node. Afterward, you should move those images from the corresponding user from private to public images in order that the rest of the users can use them. We can give you support on it.