Introduction to VIRTUAL MACHINE in OS.pptx

Virtual machine intro,benefits, hypervisor, types of hypervisor, virtualization

1. VIRTUAL MACHINE Presented by all group member

2. What is Virtual machine? A virtual machine is a software-based computer that runs within a physical computer(known as host).It emulates the behavior of a physical machine and can run its own operating system(guest OS) and applications independently just like a real computer. For example , you can run a Linux VM inside a Windows Pc using tools like VirtualBox or VMware

3. Basic ideas behind VMs The fundamental idea behind a virtual machine is to abstract a hardware of single computer(CPU , memory , disk drivers , network interface card and so on) into several different environment thereby creating an illusion that each execution environment is running its own private computer.

4. Basic ideas behind VMs

5. Benefits of virtual Machine 1) we do not need new resources to use different operating system. (2) No risk of any issue with your primary operating system. (3) Testing any application on different operating system.

6. Types of virtual machine System virtual machine Process virtual machine

7. Process VMs Designed to run single application Run individual applications Manages memory and resources for single process Example: JVM(java virtual machine)

8. System VMs Virtualize an entire operating system Run multiple OS instances Managed by hypervisor Example: virtualBox

9. Uses of Virtual machine Running multiple OS Cloud computing Legacy application support Security analysis Software testing and development

10. How to setup a Virtual Machine Create a new virtual machine Allocate virtual disk space Attach a virtual network adapter Install the guest operating system(Linux) Register and activate the VM(if needed) Install necessary drivers or guest additions Most platforms like VirtualBox or Vmware offer wizard to simplify this setup

11. What are virtual machine used for? Running multiple OSs on a single machine Testing new software or OS safely (sandboxed) Running legacy applications Server virtualization (hosting multiple VMs on a single server) Secure development and debugging (isolate risky tasks)

12. HYPERVISOR

13. What is Hypervisor? A hypervisor is a special software or hardware layer that allows you to create and run Virtual machine(VMs) on your computer.

14. Types of Hypervisor There are two types of hypervisor Type 1 (Bare Metal ) Type 2(Hosted )

15. Type 1(Bare Metal)

16. Type 2(Hosted)

17. Type1(Bare Metal) Runs directly on hardware ( e.g., VMware ESXi , Microsoft Hyper-V )

18. Type 2(Hosted) Runs on top of a host OS (e.g., VirtualBox , VMware Workstation

19. What is virtualization? Virtualization is a technology that lets you create a virtual version of something like a computer , operating system ,server, or storage instead of using real physical hardware for everything. It means you can run many “virtual computers” inside one real computer.

20. Hardware virtualization Hardware virtualization is the process of creating multiple virtual machines (VMs) that run on a single physical server using a  hypervisor . A hypervisor (like VMware ESXi or Microsoft Hyper-V) directly interacts with the physical hardware. It allocates physical resources (CPU, memory, storage) to each VM. Each VM operates independently with its own OS and application

21. Hardware virtualization Benefits : Cross-platform compatibility. Testing apps on different OS versions. Reduced software conflicts

22. Storage virtualization Storage virtualization combines multiple physical storage devices into a single  logical storage pool , making management easier and more flexible. Software abstracts the physical storage from multiple devices. The system presents the unified storage as a single resource to users and applications.

23. Storage virtualization Benefits : Centralized storage management. Better performance through load balancing. Easier scaling and disaster recovery.

24. Network virtualization Network virtualization abstracts network resources, allowing multiple virtual networks to be created on a single physical infrastructure. Combines hardware (switches, routers) and software resources into a virtual network. Divides bandwidth into independent channels for better resource allocation. Benefits : Improved network efficiency and security. Easier management and scaling. Dynamic provisioning of network resources

25. Desktop virtualization Desktop virtualization separates the desktop environment from the physical machine and stores it on a remote server. Users access their virtual desktop over a network using any device (PC, tablet, thin client). All processing and data remain on the central server. Benefits : Centralized control and security. Easier software updates and patches. Flexibility for remote work.  

26. Advantages /Pros Multiple OS on one system Isolation and security Portability Cost saving Testing and development Resource optimization

27. Disadvantages/Cons Performance overhead High resource usage Host dependency Complex setup Limited hardware access