Global Journal of Information Technology: Emerging Technologies
Yazarlar: Imane Laribi, Fedoua Didi
Konular:
Anahtar Kelimeler:Cloud Computing,Virtualization,Infrastructure-as-a-Service (IaaS),Security,Platform-as-a-Service (PaaS),Software-as-a-Service (SaaS)
Özet: Face to the continuous increase of information systems implementation and maintenance costs, companies externalize more and more their Information Technology (IT) services as cloud providers, the main interest of this strategy for companies is that they pay only for services actually consumed. Cloud computing is becoming a well-known buzzword nowadays and the most attractive field of information and communication systems. After virtualization, cloud seems to be the revelation that will allow companies to be more efficient and to manage the information systems cost more confidently. Following this stunning entry, we present in this paper a survey of cloud computing, highlighting its key concepts and architectural principles and services, these services are divided into three category Infrastructure-as-a-Service (IaaS), Platform-as-a-Service (PaaS) and Software-as-a-Service (SaaS). IAAS it can be defined as delivered computer infrastructure, typically a platform virtualization environment as a service. Rather than purchasing servers, software, datacenter space or network equipment, clients instead buy those resources as a fully outsourced service. Security is a big concern within IaaS, PAAS providers offer access to APIs (Application Programming Interface), programming languages and development middleware that allows subscribers to develop custom applications without installing or configuring the development environment. SAAS gives to users access to software or services which reside in the cloud and not on the user’s device. Furthermore, we discuss and compare a list of software for creating cloud-computing solutions such as Eucalyptus, OpenNubela, and OpenStack. The main aim of this paper is to provide a better understanding of the design challenges of cloud computing and to show that how cloud computing will make the business world simpler, more efficient, and more specialized.