Hypervisor is a platform that allows multiple operating systems to run on a single hardware. Using a Virtual Machine Manager or also called Hypervisor; the network administrators will be able to host several operating systems on one physical server.
There are two types of hypervisors:
Hypervisor type1: Is a kind of application that plays a role of an Operating System (OS). A good example of Hypervisor type1 is the VMware ESXi. You can install VMware ESXi on a bare metal server like a windows operating system or Linux OS. So the Hypervisor type1 is installed directly on a server’s hardware. There is no need for any operating system to be installed first.
Hypervisor type2: This kind of Hypervisor is like an application that is installed on top of the operating system like windows . Vmware Workstation is a good example of type2 hypervisor. Type 2 hypervisor requires an operating system to be installed on the hardware first. The hypervisor can not talk directly to the hardware.
What is DCUI?
Direct Console User Interface is the console screen of the Vmware ESXi. After the Vmware ESXi is installed on the hardware; there is no graphical interface for the management of this hypervisor. You can only connect to the console using the keyboard to do some basic tasks on this management interface. All in all; the console screen of the Vmware ESXi is called DCUI.
Administrators can use the DCUI to do some basic configuration of the VMware ESXi servers such as configuring IP address, Subnet mask, Default gateway and also DNS configurations. You can also configure the Management Network and test network connectivity.
What are three ways to manage ESXi server?
Administrators can connect to the Vmware ESXi servers in three different ways:
1: DCUI: Direct Console User Interface
2: Windows client: Also knows as the vmware vSphere client; can be installed ONLY on windows operating systems.
3: vSphere Web Client: The web interface that is used to manage and configure vSphere hosts (Vmware ESXi servers). In order for the vSphere Web client to work properly; the vCenter Server is required to be installed on the network.