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In this video, we'll talk about open source virtualization options.

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So what exactly is virtualization?

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Well, virtualization allows you to run a complete operating system in software.

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A main benefit of doing this is efficient hardware use.

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In the old days, you would be installing a server on a computer, and if your server is

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only running at 20% of the computer's capacity, then 80% of the computer capacity is wasted.

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That is why there is virtualization.

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So you would install a hypervisor on that computer, and you can run five machines that

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each are running at 20% to fully use the computer capacity.

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Another benefit is that it allows you to run other operating systems on top of your computer,

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which is excellent for learning.

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Chances are that you are using it right now to study the topics in Linux Plus.

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In virtualization, the hardware that is present in the host operating system is presented

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by virtualized drivers.

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That means that the virtualization layer has its own driver that allows you to communicate

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with the real hardware drivers of the underlying host operating system.

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Now, these virtual drivers are engineered in such a way that you get direct access to

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the hardware devices with a minimal performance loss.

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Linux is an excellent platform for virtualization.

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And the Linux kernel offers KVM, which is kernel-level virtualization.

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It's embedded in the Linux kernel, so you don't have to do anything in addition to use it.

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KVM virtualization is very efficient, and for that reason, it is frequently used in

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commercial applications.

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Voxmox is an open-source solution that provides scalable virtualization that is based on KVM.

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And it's rapidly increasing in popularity, particularly since one of the main vendors

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of virtualization solutions, VMware, has tripled their prices.

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Alternatively, Oracle VirtualBox and VMware Workstation are frequently used for running

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virtual machines on Linux or on top of macOS or Windows, which makes them excellent for

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learning.

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So for learning Linux, it's common to install Linux as a virtual machine on either operating system.

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A technology that is used a lot in learning environments is nested virtualization.

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And this is so nice because it allows you to run a virtual machine within a virtual machine.

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Let's go to the next lesson where you will learn more about running KVM virtual machines.