2-1 Virtualization Concepts Explained

Key Concepts

• Virtualization
• Hypervisor
• Virtual Machine (VM)
• Resource Allocation
• Virtual Network

Virtualization

Virtualization is the process of creating a virtual version of something, such as hardware platforms, storage devices, or network resources. It allows multiple operating systems to run on a single physical machine, maximizing resource utilization and improving efficiency.

Hypervisor

A hypervisor, also known as a virtual machine monitor (VMM), is software that creates and runs virtual machines (VMs). It allows multiple operating systems to share a single host computer's hardware resources. There are two types of hypervisors: Type 1 (bare-metal) and Type 2 (hosted).

Virtual Machine (VM)

A virtual machine is an emulation of a computer system. VMs provide the functionality of a physical computer, including a virtual CPU, memory, and storage. Each VM runs its own operating system and applications, isolated from other VMs and the host system.

Resource Allocation

Resource allocation in virtualization involves distributing the physical resources of the host machine among the virtual machines. This includes CPU, memory, storage, and network resources. Dynamic resource allocation allows for efficient use of resources based on the needs of each VM.

Virtual Network

A virtual network is a software-defined network created within a virtualization environment. It allows VMs to communicate with each other and with external networks. Virtual networks can be configured to provide isolation, security, and flexibility in network management.

Examples and Analogies

Think of virtualization as a multi-tenant building where each tenant has their own apartment (VM) but shares common facilities (hardware resources). The building manager (hypervisor) ensures that each tenant has access to the necessary resources while maintaining privacy and security.

Another analogy is a shared kitchen in a co-living space. Just as multiple residents share the kitchen but have their own cooking utensils (VMs), virtualization allows multiple operating systems to share hardware resources while maintaining their own environments.