Abstract

Cloud computing provides an attractively affordable computing platform. Instead of buying and configuring a physical server, with all the associated time, effort and up front costs, users can rent "servers" in the cloud with a few mouse clicks for less than 10 cents per hour. Cloud providers keep their costs low by providing virtual machines (VMs) instead of physical computers. The key enabler is the virtualization software, called a virtual machine monitor (VMM), that emulates a physical machine. Users are safely isolated in their "guest" VMs, and are blissfully unaware that they typically share the physical machine ("host") with many others.

 

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