All language subtitles for 002 Virtual machines

Before we begin building a loud environment

Let's take a look at what average machine is and why we would want to use

A virtual machine is a software to find computer that runs inside of another

Physical computer is defined by the hardware we place inside of

How many CPUs how much memory and any other devices that are installed on that physical

A virtual machine and contrast is encapsulated in a set of files

This allows for us to rapidly modify the configuration of the virtual machine without having to make physical

In addition because the virtual machine consists of a set of files

Anything that we can do with the file you can do with a virtual machine

Including making a backup

Topping or cloning it and sending it to

The country or across the world

Beings can have largely the same Hardware as physical computers including network interface cards hard drive

USB devices in sketchy device

First machines use the same operating system and applications is a physical computer

From the point of view of the operating system he can't tell whether it's running in a virtual machine or on physical hard

So why would we want to use a virtual machine

Common reason for using a virtual machine is server consolidation

A physical computer is typically using about 5 to 15% of its CPU

By running multiple virtual machines inside of the same physical host

We can increase the CPU utilization up to closer to 60 to 80%

Get better utilisation of the other resources as well

Another reason for using a virtual machine is Hardware Independence

Because of virtual machine abstracts the underlying physical Hardware

The same virtual machine can be run on multiple Hardware types

Without having to make any changes inside of the

Because of virtual machines are encapsulated as set of files they provide for better mobility and Duke

Virtual machines also help to reduce downtime

Because we can move a live running virtual machine from one host to another hose

This means that Hardware maintenance operations no longer require machine downtime

Finally first machines allow for automation of development and production

The platform that a virtual machine runs on top of is called the high for

The hypervisor is the core of the vsphere environment

It's responsible for scheduling the CPU

All of the rich machines running on a host

Run directly on the CPU

But the hypervisor man is scheduling to ensure that each Works machine gets the CPU that it's entitled to

Hypervisor is also responsible for sharing the physical memory

Among all of the running virtual machines

Other types of Hardware emulated by the

Including controllers network interface cards and USB control

There are two types of hypervisors that are available

A bare metal hypervisor has less overhead

And better performance because it's running directly on top of the physical Hardware

Examples of a bare metal hypervisor include esxi and citric zinsser

I hosted hypervisor while it has less performance because it is running on top of an operating

Does provide for more flexibility in easier

Most production environments run on top of a bare metal hypervisor such as esxi

How many lab environments run on top of a potion hypervisor

Such as being more works

In this course I'll be running esxi on the bare metal

On top of that I will install a control center VM that provides for basic services like DNS in NFL

And then I'll use a script written by William lamb to install three nested esxi host and vcenter server

Finally how install three small test virtual machines inside of the nesa TS