The Role of a Virtual Machine
What Is a Virtual Machine?
Definition
Virtual machine
A virtual machine (VM) is a software-based emulation of a physical computer.
It provides a layer of abstraction that allows software to run in a controlled, isolated environment.
Note- A virtual machine is not a physical machine.
- It's a software construct that mimics the behaviour of a physical computer.
Key Features of Virtual Machines
We need a VM for:
- Isolation
- Each VM operates independently, ensuring that issues in one VM do not affect others.
- For that property, it's widely used in cybersecurity, as potential hackers cannot access the original machine.
- Portability
- VMs can be moved between different physical machines without modification.
- VM Image allows you to duplicate and distribute the state of a VM.
- Abstraction
- VMs abstract the underlying hardware, allowing software to run on any compatible host.
- Hence, reducing the need for physical hardware lowers costs.
Think of a virtual machine as a sandbox where you can run applications without worrying about affecting the host system.
ExampleVMs can be used for:
- Software Development: VMs provide a controlled environment for testing applications on different operating systems.
- Server Consolidation: Multiple VMs can run on a single physical server, optimising resource usage.
- Disaster Recovery: VMs can be easily backed up and restored, ensuring business continuity.
- Legacy Software: VMs can run outdated applications on modern hardware.
- For instance, to run software designed for Windows XP on modern Windows 10 machines.
How Virtual Machines Work
A hypervisor is software that creates and manages virtual machines.
There are two types:
