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If I install Ubuntu 10.04 Server, will it provide me with virtual machines which I can use to install different OSes? I need Debian Lenny on a VM for example. What facilities does it provide? Is it a good idea to install it on one server (not a cluster of any kind) meant to serve as a virtual machines host server?

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Cloud:

A cloud is a group of servers that share resources for virtualization. When you create a new virtual machine it automatically decides on what server to put the VM and what storage to use depending on the resources left.

It can be seen as a storage pool or resource pool.

There is no real point in setting up a cloud on only one server if you don't intend on adding other servers to the cloud. You would lose performance.


Virtual Machine Host:

You would probably be more interested in just setting up a virtual machine host which will use libvirtd for managing your virtual machines and qemu/kvm for the actual virtualization.

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It allows you to use (roughly) the same API and system as Amazon's Elastic Cloud (by way of the Eucalyptus project). It can be useful for compartmentalising your servers - otherwise straight VM's are OK as well.

Services offered include virtual machines which can be spun up/down at will - with the same resource allocation as Amazon, and a separate storage system. If you are considering using Amazon EC2 in the future it would be sensible - otherwise if you will always be a straight VM shop then there is no need.

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