虚拟机中安装Virtualbox，嵌套的虚拟机不能运行64位系统

最新推荐文章于 2025-06-06 06:03:06 发布

转载最新推荐文章于 2025-06-06 06:03:06 发布 · 351 阅读

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本文探讨了在VirtualBox中实现虚拟机嵌套的可能性。对于32位操作系统可以在虚拟机内部再运行一层虚拟机，但64位系统则不支持。文章还介绍了VirtualBox为何无法支持64位嵌套虚拟机的技术原因，并提到了其他虚拟化平台如VMware和Xen的解决方案。

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https://www.quora.com/Can-I-install-Virtualbox-in-a-virtual-machine

Here is a previous question on Quora about it: Is it possible to install Virtual machine inside a virtual machine using virtual box? aka nesting of virtual machines!

Short answer: You can run 32-bit operating systems nested, but not 64.

可以运行32位，64的运行不了

Below is the excerpt from my book: VirtualBox at warp speed, Book

Nested Virtualization

Nested virtualization is running VM inside a guest VM. This is a fun topic/project to think about and mostly people wonder why this is important or what purpose it serves.

Understanding if this is possible and why if not, helps us understand virtualization better. For VirtualBox itself the answer to this is “yes” for running 32-bit nested guests and “no” for 64-bit. VirtualBox does NOT have the code for running 64-bit VMs without CPU Extensions (AMD-V, Intel VT-x). So the inner VM that is running on a host VM will not be able to support 64-bit. The parent/host (which is a guest VM) will not have the CPU extension feature. Supposedly VMware and Xen support soft coding the CPU extensions. And then there are possibilities of crossing virtualization technologies such as starting Xen inside VirtualBox, etc.

The Intel Haswell CPU has a new virtualization technology called Virtual Machine Control Structure (VMCS) Shadowing. VMCS shadowing, accelerates nested virtualization allowing guests to run with minimal impact. VMCS may become mainstream once all virtualization technologies start to implement it. VMCS allows you to run multiple hypervisors on one CPU natively. If there is a need to create nested VMs (or many VMs), consider running container based VMs such as Linux Containers or OpenVZ. Containers should typically run inside another VM without any issues.

Reasons

Below are some reasons to use nested virtualization.

Cloud infrastructure development work
Testing or learning other hypervisors
Split off container type machines inside hypervisor type machines where it makes sense
If you are already renting a server in the cloud that is virtual and want to have more VMs inside