6 Taxonomy of Virtualization + Process Execution Virtualization

Hello students,

In our last lecture we saw that for any type of virtualization, there are three basic components namely the host, virtualization layer and the guest.

In this lecture we have bird's view of taxonomy of Virtualization (classification into categories and types of Virtualization) .

Virtualization is emulating some real thing. In our last lecture, we saw how an electric extension board emulates a live electric point. In computers, that real thing which we want to emulate can be a hard disk, or a machine or a operating system etc.

Emulating a hard disk, would mean, emulate as if I have my own file system, folders. I should be able to save files in my folder. My emulation copy is private to me and no one else can access it.

When we share our desktop to somebody through a software like AnyDesk, it is an emulation of what's happening on the real desktop, onto somebody's remote screen. This is one type of emulation/virtualization example. In specific, this is called Desktop Virtualization.

In  a machine, we have processor, memory, storage, programs, operating system. We also have machines that are part of networks. We can emulate each of these using some technique.

In this lecture, we look into techniques used to emulate
  • Storage emulation (eg. SAN)
  • Network emulation (eg. VLAN)
  • Desktop emulation (eg. desktop sharing)
  • Application server emulation (eg load balancer)
The last type of emulation is execution emulation. It focusses on emulating all your program processes running in your memory. These are categorized into two types namely system level processes and  application processes.

Application processes examples are your Office word application but a system level process example is your operating system kernel which has programs to delete everything on your computer. If a hacker gets access to your system level processes, it can destruct/obstruct all your computer resources.

Application processes depend on System processes to do system level tasks and not vice versa.

In this lecture, we deep dive Process emulation only.

As we know our programs are made up of processes. A word application that runs on your desktop is an example of application process.

We deep dive into three types of process level emulation, namely

  • Operating system virtualization 
    • (eg. Container softwares such as dockers, kubernetes are examples of operating system virtualization, where underlying operating system is shared with all containers that contains some running softwares)
  • Programming language virtualization 
    • (eg. "java" command that we use in our labs utilizes the underlying java runtime program to execute ".class" files)
  • Application virtualization 
    • (eg. .net application running in different operating system environment such as linux)




Thank you

Comments

Post a Comment

Popular posts from this blog

11 Computing Platforms

Welcome students ! Introduction to Unit 2  In Unit 2, we look at platform architectures that have evolved over time from the days of  earlier main frame architecture into today's cloud service platform architecture. Today we have cloud computing platform which use and provide cloud technologies   ( Parallel Computing, Distributed Computing, Service Oriented     Computing, Virtualization, Web 2.0 (soap, rest, ajax, mashup),  Utility Computing ) cloud delivery services reference model  ( IaaS,PaaS, SaaS ) cloud deployment types  ( Public, Private, Hybrid, Community ) In Unit 1 we already introduced ourselves to cloud technologies such as Parallel Computing, Distributed Computing, Service Oriented Computing and Virtualization.  Just like evolution theory says a monkey became man over many phases, this blog summarizes the Computing Platform architecture for enterprises that has evolved over time in four phases  (computing platform: e...
Read more

10 Virtualization Software - HyperV

Image
Hello students, So far we covered the entire classification (taxonomy) of Virtualization. In the business world, Xen, VMWare and HyperV are some of the leading virtualization products. Xen uses ParaVirtualization technique , VMWare uses Full Virtualization technique whereas HyperV uses the both Para and Full Virtualization techniques together Xen and HyperV are Type 1 Hypervisors which run directly over the hardware, whereas VMWare is a Type 2 Hypervisor, which runs above the operating system We dig deeper into Microsoft HyperV in this lecture Some of you may have partitioned your hard disk to install two operating systems on your hard disk. HyperV uses same technique to manage different virtual machine HyperV automatically creates, uses and manages partitioning to enable different guests. It has one master partition managing all other partitions called child partitions We dig further into the enlightened I/O technology utilized by Hyper-V that improves performance by allowing direct...
Read more

23 Three cloud platforms AWS / Google Cloud / Azure

Hello students, If you are ever asked a question in exam about “Cloud Platform” (not PaaS), remember three cloud platform providers namely AWS, GCP, Azure In this blog we look at the cloud computing features provided by three cloud providers namely Amazon Web Services (AWS) Google Cloud Platform (GCP) Microsoft Azure Cloud Amazon Web Services We look specifically at 13 services provided Amazon Web Services cloud provider 1. Management Console – user interface for customers to use AWS services over the internet 2. Elastic Compute Cloud (EC2) – virtual machine provisioning 3. Internet Users – User access is secured via public key infrastructure and Identity Access Management services 4. Amazon Machine Image (AMI) – linux, windows images are readily available to use and go, with many other complex machine image via AMI services 5. Static Network Addresses – Elastic , public and static IP addresses is available readily for use over the internet 6. Servers – any number o...
Read more