The operating system that is installed on your laptop or desktop that hosts virtual machines. This is commonly referred to as the host OS or host. In short, the machine where your Virtual Box is installed. The operating system that is installed on your Virtual Box Virtual Machine. This virtual instance is independent of the host OS. It is commonly referred to as guest OS or guest. In this context, refers specifically to servers. Each OpenStack server is a node. Hosts the database, Keystone (Middleware), and the servers for the scope of the current OpenStack deployment. It acts as the brains behind OpenStack and drives services such as authentication, database, and so on. Has the required Hypervisor (Qemu/KVM) and is your Virtual Machine host. Provides Network-as-a-Service and virtual networks for OpenStack. After the network interfaces file has been setup, you can switch to an SSH session by using an OpenSSH client to log in remotely to the required server node (Control, Network, Compute). Open a terminal on your host machine and run the following command: $ ssh-keygen -t rsa Generating public/private rsa key pair. Enter the location in which to save the key (/u/kim/.ssh/id_rsa): [RETURN] Enter passphrase (empty for no passphrase): <can be left empty> Enter same passphrase again: <can be left empty> Your identification has been saved in /home/user/.ssh/id_rsa. Your public key has been saved in /home/user/.ssh/id_rsa.pub. The key fingerprint is: b7:18:ad:3b:0b:50:5c:e1:da:2d:6f:5b:65:82:94:c5 xyz@example