Webopedia on Google+Webopedia on TwitterWebopedia on FacebookTech Bytes Blog
Main » TERM » N »

nested virtualization

Nested virtualization refers to virtualization that runs inside an already virtualized environment. In other words, it's the ability to run a hypervisor inside of a virtual machine (VM), which itself runs on a hypervisor.

With nested virtualization, you're effectively nesting a hypervisor within a hypervisor. The hypervisor running the main virtual machine is considered a level 0, or LO hypervisor, and the initial hypervisor running inside the virtual machine is referred to as a level 1 or L1 hypervisor. Further nested virtualization would result in a level 2 (L2) hypervisor inside the nested VM, then a level 3 (L3) hypervisor within that nested VM, and so forth.

Which Hypervisors Support Nested Virtualization and Use Cases for Nested Virtualization

Not all hypervisors and operating systems support nested virtualization. Hypervisors that do support nested virtualization include KVM and VMware ESXi hypervisors (called Nested ESXi). Nested ESXi also supports Hyper-V, Xen and KVM guest hypervisors as of ESXi version 6.0.

Microsoft introduced support for nested virtualization with Hyper-V in Windows Server 2016.

Nested Virtualization
Nested virtualization can be used for development and testing purposes, virtualization training, providing guest virtualization to end users, deployment testing of "virtual clouds," testing configurations and other cases where running multiple hypervisors on the same host server might be needed.







TECH RESOURCES FROM OUR PARTNERS
LATEST ARTICLES
Slideshow: 5 Hot Holiday Gifts for Tech Enthusiasts

From cute electronic toys to VR gaming, here are 5 hot gifts to give to your special tech enthusiast this holiday season. Read More »

What's Hot in Tech: AI Tops the List

Like everything in technology, AI touches on so many other trends, like self-driving cars and automation, and Big Data and the Internet of Things... Read More »

DevOp's Role in Application Security

As organizations rush to release new applications, security appears to be getting short shrift. DevSecOps is a new approach that holds promise. Read More »

STUDY GUIDES
Java Basics, Part 1

Java is a high-level programming language. This guide describes the basics of Java, providing an overview of syntax, variables, data types and... Read More »

Java Basics, Part 2

This second Study Guide describes the basics of Java, providing an overview of operators, modifiers and control Structures. Read More »

The 7 Layers of the OSI Model

The Open System Interconnection (OSI) model defines a networking framework to implement protocols in seven layers. Use this handy guide to compare... Read More »