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FIWARE.Glossary.Cloud - FIWARE Forge Wiki

FIWARE.Glossary.Cloud

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  • Infrastructure as a Service (IaaS) -- a model of delivering general-purpose virtual machines (VMs) and associated resources (CPU, memory, disk space, network connectivity) on-demand, typically via a self-service interface and following a pay-per-use pricing model. The virtual machines can be directly accessed and used by the IaaS consumer (e.g., an application developer, an IT provider or a service provider), to easily deploy and manage arbitrary software stacks.
  • Platform as a Service (PaaS) -- an application delivery model in which the clients, typically application developers, follow a specific programming model to develop their applications and or application components and then deploy them in hosted runtime environments. This model enables fast development and deployment of new applications and components.
  • Project is a container of virtual infrastructure that has a set of virtual resources (e.g., computing capacities, storage capacities) to support the former. In other words, a VDC is a pool of virtual resources that supports the virtual infrastructure it contains.
  • Service Elasticity is the capability of the hosting infrastructure to scale a service up and down on demand. There are two types of elasticity -- vertical (typically of a single VM), implying the ability to add or remove resources to a running VM instance, and horizontal (typically of a clustered multi-VM service), implying the ability to add or remove instances to/from an application cluster, on-demand. Elasticity can be triggered manually by the user, or via an Auto-Scaling framework, providing the capability to define and enforce automated elasticity policies based on application-specific KPIs.
  • Service Level Agreement (SLA) is a legally binding contract between a service provider and a service consumer specifying terms and conditions of service provisioning and consumption. Specific SLA clauses, called Service Level Objectives (SLOs), define non-functional aspects of service provisioning such as performance, resiliency, high availability, security, maintenance, etc. SLA also specifies the agreed upon means for verifying SLA compliance, customer compensation plan that should be put in effect in case of SLA incompliance, and temporal framework that defines validity of the contract.
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