Virtualization-level security in cloud computing

Cloud computing is one of today's most exciting technology because of its cost-reducing, flexibility, and scalability. With the fast growing of cloud computing technology, Data security becomes more and more important in it. In evaluating whether to move to cloud computing, it is important to compare benefits and also risks of it. Thus, security and other existed issues in the cloud cause cloud clients need more time to think about moving to cloud environments. But Security-related topics is one of the most arguable issues in the cloud computing which caused several enterprises looks to this technology uncertainly and move toward it warily. In this paper I try to summarize cloud computing RAS (Reliability, Availability, and Security) issues and also clarify available solution for some of them. In this paper I try to summarize virtualization level of cloud computing security in detailed view.

I. Introduction

Cloud computing is a network-based environment that focuses on sharing computations and resources. Basically, clouds are Internet-based and try to disguise complexity for clients. Cloud providers use virtualization technologies combined with self-service abilities for computing resources via network infrastructure especially the Internet. In cloud environments multiple VMs (VM) hosted on the same physical server as infrastructure. In cloud, costumers only have to pay for what they use. Cloud computing refers to both the applications delivered as services over the Internet and the hardware and systems software in the datacenters that provide those services.