What is hypervisor? A hypervisor is a software that allows to run multiple virtual machines on a single hardware. Types of hypervisor: 1. Bare metal hypervisor or type 1 hypervisor Type 1 hypervisor are installed on the host hardware directly. Since there is no underlying software in the middle (between the hardware and hypervisor), these are faster and more efficient Ex. VMWare ESX, Microsoft Hyper V, KVM (Kernel-based Virtual Machine) 2. Embedded hypervisor or type 2 hypervisor Type 2 hypervisor are installed on the top of an existing operating system like Windows or Linux. Because of additional layer of management, these are considered less efficient compared to type 1 hypervisor. Also the additional layer poses security concern. Since they are installed on a hosted OS they are much easier to use. Ex. VMWare Player, VirtualBox So what hypervisors does Azure and Amazon use ?
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Azure Active directory (AAD) is a Identity as a Service. This is a smaller subset of Active directory. This is not a replacement to active directory at all. Azure active directory provides the identity services to the mobile apps and web apps in Private cloud. These apps may be connected to on-premise applications. So an SSO is enabled for these apps. So Azure active directory has very simple functionality. Create Users, Groups. Map groups to network security groups and provide the authentication to the resources. When you login to Azure portal, right upper corner of the screen has username along with the domain. Domain or tenant or organization are used interchangeably. Management of Users and Groups: Cloud identity (create users manually) Directory synchronized identifiers (users are synchronized) Add users Adding a cloud identity users makes the user as Guest When you do directory synchronization on Premise AD Groups are synched up with Azure