3 : Services
4 : Deployment Models
5 : Characteristics
3:Services provided by clouds:
SaaS (Software as a Service): Provides the consumer the ability to use the software in a cloud environment, such as web-based email
PaaS (Platform as a Service): Provides the consumer the ability to deploy applications through a programming language or tools supported by the cloud platform provider.
IaaS (Infrastructure as a Service): Provides infrastructure such as computer instances, network connections, and storage so that people can run any software or OS.
4:Cloud Deployment Models
Private Cloud:
The cloud infrastructure is operated solely for a single organization. It may be managed by the organization or a third party, and may exist on-premises or off-premises
Also called as “Enterprise Cloud”
Community Cloud:
The cloud infrastructure is shared by several organizations and supports a specific community that has shared concerns (e.g., mission, security requirements, policy, or compliance considerations).
It may be managed by the organizations or a third party and may exist on-premises or off-premises.
Public Cloud:
The cloud infrastructure is made available to the general public or a large industry group and is owned by an organization selling cloud services
Also called as “Internet Cloud”
Hybrid Cloud:
The cloud infrastructure is a composition of two or more clouds (private, community, or public)
Leasing public cloud services when private cloud capacity is insufficient
Also called as “Mixed Cloud”
A hybrid cloud takes shape when a private cloud is supplemented with computing capacity from public clouds
The approach of temporarily renting capacity to handle spikes in load is known as “Cloud-bursting
5: Characteristics
On-demand self-service: Users can provision servers and networks with little human intervention
Network access: Any computing capabilities are available over the network. Many different devices are allowed access through standardized mechanisms
Resource pooling: Multiple users can access clouds that serve other consumers according to demand
Elasticity: Provisioning is rapid and scales out or in based on need
Metered or measured service: Just like utilities that are paid for by the hour, clouds should optimize resource use and control it for the level of service or type of servers such as storage or processing.
