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  • james Bragg thinks this is interesting:

OpenStack instances are the same as the virtual machines that we build and operate with common virtualization tools such as VirtualBox and Qemu. OpenStack provides a central console for deploying and managing thousands of such machines on multiple hosts. Under the hood, OpenStack uses the same virtualization tools as the others. The preferred hypervisor is KVM, and if hardware acceleration is not available, Qemu emulation is used. OpenStack supports various other hypervisors, including VMware, XEN, Hyper-V, and Docker. In addition, a lightervisor, LXD, is on its way to a stable release. Other than virtualization, OpenStack adds various other improvements, such as image management, block storage, object storage, and various network con...

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Cover of Ubuntu Server Cookbook

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Best answer to, "What is OpenStack, and what does it do?" I've found anywhere.