Cloud Computing : Today Need

Cloud Computing is today need of an Industry . Do you know where your data is stored when you upload data in gmail , dropbox etc . They all goes to cloud .

So first big Question comes in mind is

What is Cloud Computing ?

Cloud computing is a model for  found everywhere , convenient, on-demand network access to a shared pool of configurable computing resources (e.g networks, servers, storage, applications, and services) that can be rapidly provisioned and released with minimal management effort or service provider interaction. ”.

In a general way, we can define computing to mean any goal-oriented activity requiring, benefiting from, or creating computers.

What are the benefits of cloud computing ?

1. On-demand self-service :- A consumer can unilaterally provision computing capabilities, such as server time and network storage, as needed automatically without requiring human interaction with each service provider.

2. Broad network access :- Capabilities are available over the network and accessed through standard mechanisms that promote use by heterogeneous thin or thick client platforms (e.g., mobile phones, tablets, laptops, and workstations).

3. Resource pooling :- The provider’s computing resources are pooled to serve multiple consumers using a multi-tenant model, with different physical and virtual resources dynamically assigned and reassigned according to consumer
demand.


4. Measured Service :- Cloud systems automatically control and optimize resource use by leveraging a metering capability at some level of abstraction appropriate to the type of service (e.g., storage, processing, bandwidth, and active user accounts). Resource usage can be – monitored, controlled, and reported, providing transparency for both the provider and consumer of the utilized service.


 5. Rapid elasticity :- Capabilities can be elastically provisioned and released, in some cases automatically, to scale rapidly outward and inward commensurate with demand. To the consumer, the capabilities available for provisioning often appear to be unlimited and can be appropriated in any quantity at any time.

The other common characteristics of Cloud Computing are

1. Massive Scale
2. Resilient Computing
3. Homogeneity
4. Geographic Distribution
5. Virtualization
6. Service Orientation
7. Low Cost Software
8. Advanced Security

Types of Cloud (Deployment Models)

Private cloud
The cloud infrastructure is operated solely for an organization.
e.g Window Server 'Hyper-V'.

Community cloudThe cloud infrastructure is shared by several organizations and supports a specific goal.

Public cloud
The cloud infrastructure is made available to the general public
e.g Google Doc, Spreadsheet,

Hybrid cloud
The cloud infrastructure is a composition of two or more clouds (private, community, or public)
e.g Cloud Bursting for load balancing between clouds

Cloud Services Models

Software as a Service (SaaS)

1. The capability provided to the consumer is to use the provider’s applications running on a cloud infrastructure. The applications are accessible from various client devices through either a thin client interface, such as a web browser (e.g., web-based email), or a program interface.

2. The consumer does not manage or control the underlying cloud infrastructure including network, servers, operating systems, storage, or even individual application capabilities, with the possible exception of limited user-specific application configuration settings.
e.g: Google Spread Sheet

Cloud Infrastructure as a Service (IaaS)

1. The capability provided to provision processing, storage, networks, and other fundamental computing resources

2. Consumer can deploy and run arbitrary software
e.g: Amazon Web Services and Flexi scale.

Platform as a Service (PaaS)
1. The capability provided to the consumer is to deploy onto the cloud infrastructure consumer-created or acquired applications created using programming languages, libraries, services, and tools supported by the
provider.

2. The consumer does not manage or control the underlying cloud infrastructure including network, servers, operating systems, or storage, but has control over the deployed applications and possibly configuration
settings for the application-hosting environment