OS Virtualization

The process of simulating hardware and software in a virtual (software) environment.

Creating a platform that emulates hardware, allowing multiple OS instances to use it as if they have full access to the hardware.

It allows multiple virtual machines (VMs) to run concurrently on a single physical host.

CPU, RAM, and storage.

Software that creates and runs virtual machines (VMs).

Support multiple guest VMs by virtually sharing its resources.

Runs directly on the hardware, usually found in server environments.

Microsoft Hyper-V, Oracle VM Server, Citrix Hypervisor.

Runs on top of a host operating system, usually found on personal computers.

Windows 10, macOS X, Linux (as host OS).

Server consolidation and dynamic resource allocation to optimise hardware use.

By requiring fewer physical machines and saving energy.

Through isolation of VMs and features like snapshot and rollback.

The ability to easily scale resources up or down.

Through live migration and clustering of VMs.

Some performance degradation due to virtualization layers.

Costs for hypervisors or VM tools that require licenses.

Hypervisor vulnerabilities and VM escape.

I/O-intensive applications and high-performance computing.

Competition between multiple VMs for the same physical resources.

Oracle VirtualBox, VMware Workstation, UTM.

Installing Oracle VirtualBox from the official website.

Launch VirtualBox Manager, click "New," configure OS type, RAM, and storage, and install the guest OS.

Choose Machine > New, select folder, name OS, set type/version, assign memory, create virtual hard disk.

Click Start, interact with the OS, and take snapshots for recovery.