Virtualization Flashcards
relies on a special type of software, known as a hypervisor, which creates the virtual hardware for devices. software to create the illusion of physical hardware.
Virturalization
many different varieties of hypervisors, including open source and commercial
Each instance of virtual hardware is called
a virtual machine, or VM.
The operating system (OS) installed within the VM is often referred to as
guest OS
the operating system of the underlying physical computer, which is called
host OS
To help you remember these terms, just think of the hypervisor as a host to a number of house guests called VMs.
access to the physical CPU and RAM resources as well as access to a virtual disk that the guest OS believes is a real, physical hard drive
guest OS
include special device drivers that you can install within the guest OS to gain performance improvements and access to features that would be otherwise impossible on physical hardware.
hypervisors
are able to host multiple VMs, each running its own guest OS and applications
Hypervisors
serves as a resource traffic cop in that it manages how each VM accesses and consumes the physical hardware resources, such as CPU, RAM, networking, and storage
still cannot communicate telepathically with one another. So, if you want them to talk to each other, you will have to install virtual network adapters in the VMs and configure their networking as you would do with your physical ser
VMs
look and feel like any other application that you may run on your laptop
Type 2 hypervisors
requires dedicated hardware and are installed as that machine’s operating system, making them more commonly found in data centers than in home networks.
Type 1 hypervisors
as VMware ESXi or the open-source KVM hypervisor, are operating systems that natively run virtual machines and are intended to be installed on a dedicated bare metal server.
Type 1 hypervisors
as VMware Workstation, is installed as an application within your existing computer or laptop operating system
Type 2 hypervisor
complete access to the underlying hardware of the physical computer, which alleviates the performance penalty that Type 2 hypervisors commonly face.
Type 1 hypervisor
very little information to the console screen of the host computer. While there may be a limited user interface for troubleshooting the hypervisor directly, all administration is typically performed from another computer, such as your laptop. On your laptop, you would direct a web browser to the IP address or hostname of the hypervisor to access its web-based administration portal.
Type 1 hypervisors
you can see the basic troubleshooting interface on its monitor but must use a web browser on a separate computer to administer the hypervisor and the VMs running on it.
are typically connected to the network just like any other physical computer. Users that need to connect to a VM typically are not granted access to the hypervisor configuration portal; rather, they are given an IP address or hostname for the VM that they need to connect to.
VMs
sometimes referred to as a hosted hypervisor, is installed as an application on personal computers or laptops. This allows the user to run different VMs that all share the laptop or computer’s hardware resources. This allows you to run operating systems within a VM other than what was natively installed on your computer or laptop
Type 2 hypervisor
they are installed and run as a regular application on your computer or laptop
Type 2 hypervisors
This means two things: first, the hypervisor is competing for hardware resources with all the other running applications on your computer; and second, the hypervisor does not have direct and unrestricted access to the physical hardware but instead must send all your VM’s hardware requests through your computer’s operating system
Type 2 hypervisors
Both issues can lead to degraded performance within your VMs, but slower performance may be far more desirable than buying and carrying around separate computers