ABSTRACT
Figure 14.1 shows how the cloud services and operation models changed the setup and responsibilities between the cloud service provider and the customer. e introduction of virtualization and new ways to share all kinds of IT-related services brought a big push to the hosting or cloud market. It was cheaper and more eective for many customers to only rent the IT resources (e.g., storage, CPU workloads, or complete applications) on demand to be able to scale exible based on their own business. Also the cloud oered a new model of IT Infrastructure system design and consumption. Everything is a cloud-based (meaning virtualized, potentially shared, and Internet facing) service, which can be used together with
other cloud services. In other words, it is more like a modular set of granular IT services, that is ready any time, and indenitely scalable.
