Imagine using a single, powerful physical server as if it were multiple PCs operating simultaneously. It sounds weird, doesn’t it? However, virtualization makes this absolutely possible.
One of the technologies operating in the background of cloud computing is virtualization. It makes computing more adaptable, effective and scalable by enabling cloud providers to split up physical resources into several virtual environments.
Table of Contents
What is Virtualization?
The process of turning a real computing resource into a virtual one is known as virtualization.
This resource could be a:
- Server
- Operating system
- Storage system
- Network
- Desktop
- Application
Server virtualization is one of the most prominent examples in cloud computing.
Multiple virtual machines (VMs) can operate on a single physical server because of virtualization, as opposed to using a single physical server for a single application or user. Every virtual machine functions as a separate computer. It may have its own storage, applications, operating system and allotted resources.
Example
Let’s say a physical server has:
- 16 CPU cores
- 64 GB of RAM
- 1 TB of storage
Even if a single workload only requires a small percentage of the server’s resources, the entire server might be devoted to it in the absence of virtualization. The server can be split up into multiple virtual computers via virtualization.
For example:
Physical Server → Hypervisor → VM 1 + VM 2 + VM 3 + VM 4
Each virtual machine (VM) may handle its own task and receives a fraction of the server’s resources. Therefore, a single physical machine can act as several distinct devices.
How Does Virtualization Works?
A hypervisor is the primary component in charge of monitoring virtual computers.
Software or hardware that builds and controls virtual computers is called a hypervisor. It regulates how various virtual machines (VMs) share physical resources like CPU, memory and storage.
The basic structure looks like this:
Physical Hardware
↓
Hypervisor
↓
Virtual Machines
↓
Applications
The hypervisor distributes the necessary resources from the physical hardware to a virtual computer when it needs CPU or memory. It also maintains the virtual computer’s separation from each other.
What is a Virtual Machine (VM)?
A software-based computer that operates on a real computer is called a virtual machine (VM). It can have it’s own:
- Operating system
- CPU allocation
- Memory
- Storage
- Applications
One physical server, for example, could operate a Windows virtual machine and a Linux virtual machine. Despite sharing a physical system, the two virtual machines function as distinct environments.
Types of Virtualization
Server Virtualization
One physical server is divided into several virtual servers through server virtualization. As cloud providers may execute the workloads of several clients on the same physical infrastructure, it is often used in cloud computing.
Storage Virtualization
Storage virtualization creates a single logical storage system by combining storage resources from various physical devices. This simplifies the management and distribution of storage.
Network Virtualization
Network virtualization uses physical networking hardware to construct virtual networks. It enables businesses to set up and maintain several network environments without needing entirely different physical infrastructure for each.
Desktop Virtualization
With desktop virtualization, users can access a remote server-hosted virtual desktop environment. The desktop environment can be accessed remotely rather than relying just on the user’s actual machine.
Application Virtualization
Applications that are typically set up and installed directly on the user’s device can now operate in an isolated environment because of application virtualization.
Why is Virtualization Important in Cloud Computing?
- Improved Resource Utilization: Enables the sharing of physical hardware among several workloads.
- Cost Savings: Less infrastructure and physical servers are required.
- Simple Scalability: It’s easy to construct, resize and remove virtual machines.
- Faster Deployment: Compared to real servers, new virtual environments can be put up far more quickly.
- Isolation: Maintains the separation of various workloads and applications from one another.
- Flexibility: Allows for the use of various operating systems and applications on a single physical server.
Virtualization vs Cloud Computing
Although they are closely connected, virtualization and cloud computing are not the same.
- Virtualization is a technology.
- Cloud computing is a way of delivering computing resources and services.
Cloud providers can more effectively divide and manage physical infrastructure due to virtualization.
These resources are used by cloud computing to deliver services like:
- Virtual Machines
- Storage
- Databases
- Applications
- Networking
Therefore, virtualization can be seen as one of the primary technologies that make current cloud infrastructure possible but cloud computing includes much more than just virtualization.
Real-World Cloud Example
Let’s say a cloud provider’s data center has a large physical server.
The provider may use virtualization to generate many virtual computers rather than dedicating that server to a single customer.
One physical server → Hypervisor → Multiple VMs → Different customers/workloads
- Customer A may host a website in a single virtual machine.
- Customer B may execute an application in a different virtual machine.
- Customer C may test in a different virtual machine.
Despite being logically distinct, all of these workloads can operate on the same physical hardware.
Due to this, cloud providers are able to supply thousands or even millions of customers with computing resources without needing a separate physical server for each workload.
Is Virtualization the Same as a Virtual Machine?
Not exactly.
The technology or method used to build virtual environments is called virtualization. One result of that approach is a virtual machine.
Consider it this way:
- Virtualization: The technology
- Virtual Machine: The virtual computer made with that technique.
Conclusion
Virtualization changes the way physical computing resources are used. Instead of treating every physical server as a single isolated machine, it allows one server to host multiple virtual environments.
That simple idea has a huge impact on cloud computing. It helps providers use hardware efficiently, deploy resources faster and give users flexible computing environments without requiring physical machines for every workload.
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