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第 22 章 Creating nested virtual machines

You can use nested virtual machines (VMs) if you require a different host operating system than what your local host is running. This eliminates the need for additional physical hardware.

警告

In most environments, nested virtualization is only available as a Technology Preview in RHEL 10.

For detailed descriptions of the supported and unsupported environments, see Support limitations for nested virtualization.

22.1. What is nested virtualization?
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With nested virtualization, you can run virtual machines (VMs) within other VMs. A standard VM that runs on a physical host can also act as a second hypervisor and create its own VMs.

Nested virtualization terminology

Level 0 (L0)
A physical host, a bare-metal machine.
Level 1 (L1)
A standard VM, running on an L0 physical host, that can act as an additional virtual host.
Level 2 (L2)

A nested VM running on an L1 virtual host.

Important: The second level of virtualization severely limits the performance of an L2 VM. For this reason, nested virtualization is primarily intended for development and testing scenarios, such as:

  • Debugging hypervisors in a constrained environment
  • Testing larger virtual deployments on a limited amount of physical resources
警告

In most environments, nested virtualization is only available as a Technology Preview in RHEL 10.

For detailed descriptions of the supported and unsupported environments, see Support limitations for nested virtualization.

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