What's the cloud computing?
Most of the session I'm attending related to the cloud computing starting with this question but every time you 'll find another definitions !! ..Any way I love the NIST Definition of Cloud Computing
Cloud computing is a model for enabling ubiquitous, 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.
This cloud model is composed of five essential characteristics, three service models, and four deployment
models.
Essential Characteristics:
You will find other service models in this post
http://muhammadhamed.blogspot.com/2010/10/cloud-computing-definitions-and-types.html
Like Data-as-a Service, Identity and policy as aservice .. etc.
References
Most of the session I'm attending related to the cloud computing starting with this question but every time you 'll find another definitions !! ..Any way I love the NIST Definition of Cloud Computing
Cloud computing is a model for enabling ubiquitous, 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.
This cloud model is composed of five essential characteristics, three service models, and four deployment
models.
Essential Characteristics:
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.
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).
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. There is a sense of location
independence in that the customer generally has no control or knowledge over the exact
location of the provided resources but may be able to specify location at a higher level of
abstraction (e.g., country, state, or datacenter). Examples of resources include storage,
processing, memory, and network bandwidth.
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.
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.
Service Models:
Software as a Service (SaaS). 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. 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 userspecific application configuration settings.
Platform as a Service (PaaS). The capability provided to the consumer is to deploy onto the cloud infrastructure consumer-created or acquired applications created using programminglanguages, libraries, services, and tools supported by the provider.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.
Infrastructure as a Service (IaaS). The capability provided to the consumer is to provision
processing, storage, networks, and other fundamental computing resources where the
consumer is able to deploy and run arbitrary software, which can include operating
systems and applications. The consumer does not manage or control the underlying cloud
infrastructure but has control over operating systems, storage, and deployed applications;
and possibly limited control of select networking components (e.g., host firewalls).
You will find other service models in this post
http://muhammadhamed.blogspot.com/2010/10/cloud-computing-definitions-and-types.html
Like Data-as-a Service, Identity and policy as aservice .. etc.
Deployment Models:
Private cloud. The cloud infrastructure is provisioned for exclusive use by a single organization comprising multiple consumers (e.g., business units). It may be owned, managed, and operated by the organization, a third party, or some combination of them, and it may exist
on or off premises.
Community cloud. The cloud infrastructure is provisioned for exclusive use by a specific
community of consumers from organizations that have shared concerns (e.g., mission,
security requirements, policy, and compliance considerations). It may be owned,
managed, and operated by one or more of the organizations in the community, a third
party, or some combination of them, and it may exist on or off premises.
Public cloud. The cloud infrastructure is provisioned for open use by the general public. It may be owned, managed, and operated by a business, academic, or government organization, or some combination of them. It exists on the premises of the cloud provider.
Hybrid cloud. The cloud infrastructure is a composition of two or more distinct cloud
infrastructures (private, community, or public) that remain unique entities, but are bound
together by standardized or proprietary technology that enables data and application
portability (e.g., cloud bursting for load balancing between clouds).
Why should I transform to the cloud?
The fact that cloud provides a new business model which is pay-as-you-go .. in this model you will pay only for what you actually used, you will not reserve a complete servers with a specific bandwidth ..etc as in the old model but you will request at any time a a machine <virtual machine> .. think about your own infrastructure if you want to scale your own infrastructure how much time you need to buy the Hardware and configure, and plugin it into your infrastructure .. in the cloud this done via a clicks.
the matter of the cloud of being Elastic encourages The small and medium companies to start their own business.. How? he can request a cluster of machines with small money .. and he can scale it at any time with just clicks if the business expanded.
So transforming to the cloud will save a lot of money and will handle a lot of risks.
the matter of the cloud of being Elastic encourages The small and medium companies to start their own business.. How? he can request a cluster of machines with small money .. and he can scale it at any time with just clicks if the business expanded.
So transforming to the cloud will save a lot of money and will handle a lot of risks.
I hope this could help. In the next posts I'll speak about building application for the cloud.
