IaaS as a Foundation

So far, we’ve looked at the components that make up a cloud service from the consumer viewpoint—the use case, design patterns, and deployment models they can consider when using or deploying cloud. Chapter 1 also looked at the different cloud service models: Infrastructure, Platform, and Software as a Service. This section describes the why, for the service provider, IaaS¹ is a foundation for the other two service models and describes the components that are required in IaaS¹ to support the typical use cases and design patterns described. Review the SaaS¹ and PaaS¹ definitions from Chapter 1:

• SaaS: The capability provided to the consumer to use the provider’s applications running on a cloud infrastructure

• PaaS: The capability provided to the consumer to deploy onto the cloud infrastructure consumer-created or -acquired applications created using programming languages and tools supported by the provider