Cloud computing:

The provisioning of services in a timely on-demand manner and allow scaling up and down of resources is called as cloud computing.

Cloud architecture is defined from the perspectives of cloud consumers, cloud providers and cloud brokers.

1. Cloud computing implies access to remote computing services offered by third parties via a TCP/IP connection to the public internet.

2. It is a style of computing in which resources are provided “as a service” over the internet to users who needs not have knowledge of, expertise in, or control over the technology infrastructure that supports them.

3. A cloud service has 3 different characteristics

• Sold on demand

• Elastic behavior

• Fully managed by the provider.

1. For example, “Google Apps” provides common business application online that are accessed from a web browser, while the software & data are stored on the internet servers.

2. Basically, cloud computing is the use of hardware and software to deliver a service over a network.

Cloud Computing Architecture:

1. Cloud: a massive network of servers on individual PC’s interconnected in a GRID. These computers run in parallel and combine all their resources to generate supercomputing like power.

2. Cloud Consumer: Is a person or organization that processes and utilizes cloud services, Such as Amazon EC2

   Individual users connect to the cloud from their own personal computers over the internet. the cloud appears to them as a single application device or document i.e hardware components are invisible the architecture seems simple, although it does require some intelligent management to connect all task computers together and assign task processing to multiple users.

3. Cloud Provider: Is the person who maintains computing h/w and s/w and supplies cloud services to other. E.g. Amazon

4. Cloud Broker: Is a person that manages usages, performance and delivery of cloud services and negotiates relationship between cloud providers and cloud consumers.

Working:

1. The user uses the fronted interface to select a task or service.

2. The user’s request is then passed to the system management which finds correct resources and calls appropriate provisioning services.

3. These services launch the appropriate web application and either crate or open the requested documents.

4. The system monitoring functions then track the usage of the cloud so that resources are distributed to proper users.

                                           Fig: cloud computing architecture