Ubuntu 18 and 16. We plan to extend the support to other OS in the future.
The machines and related software are setup and configured using SSH.
Any cloud provider. Consortia takes care to setup all the software needed to run the network. This is done in order to keep the solution cloud agnostic.
Hyperledger Fabric 1.4.7. We plan as well to support HLF 2.2.
Hyperledger CA. You can find details here: https://hyperledger-fabric-ca.readthedocs.io/en/release-1.4/
Yes you can. For more details how to do that refer to the Hyperledger CA documentation.
The two CA servers are root CAs and used for different purpose:
to issue certificates for the Hyperledger fabric identities: users, peers and orderers
to issue TLS certificates used to establish secure TLS based connections between the Hyperledger fabric nodes (peers, orderers and clients)
The CA servers are accessible over highly secured mutual TLS connection by using Fabric CA CLI or Fabric CA REST APIs as described here.