User-mode Linux (UML). Virtualization at the OS-Layer, basically "Linux inside Linux"

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Howto getting started with User Mode Linux using rootstrap?

I have Ubuntu 10.10 installed and would like to create some instances of User Mode Linux (UML) using bootstrap, but all information I can find seems out-dated, and my simple attempts fails. Any one ...
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Linux Virtualization Options on EC2

I need to subdivide EC2 (or perhaps other cloud provider) instances. I know you cannot run a full virtualization stack on another. For instance a Xen guest cannot host a VirtualBox guest. So this ...
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How can I generate filesystem images that are usable on many different virtualization systems?

I have written a script that generates a root filesystem image (based on Debian lenny) suitable for User-Mode Linux. (Essentially this script creates a filesystem image, mounts it with a loop device, ...