Introduction To Cloud Computing
What is Cloud Computing?
Cloud computing is the on-demand delivery of compute power,database storage,applications,and other IT resources through a cloud services platform via the internet with pay-as-you-go pricing
Cloud Computing Basics
Whether you are running applications that share photos to millions of mobile users or you’re supporting the critical operations of your business, a cloud services platform provides rapid access to flexible and low cost IT resources. With cloud computing, you don’t need to make large up front investments in hardware and spend a lot of time on the heavy lifting of managing that hardware. Instead, you can provision exactly the right type and size of computing resources you need to power your newest bright idea or operate your IT department. You can access as many resources as you need, almost instantly, and only pay for what you use.
Trade capital expense for variable expense
Instead of having to invest heavily in data centers and servers before you know how you’re going to Use them, you can only pay when you consume computing resources, and only pay for how much you consume.
Benefit from massive economies of scale
By using cloud computing, you can achieve a lower variable cost than you can get on your own.Because usage from hundreds of thousands of customers are aggregated in the cloud, providers such as Amazon Web Services can achieve higher economies of scale which translates into lower pay as you go prices.
Stop guessing capacity
Eliminate guessing on your infrastructure capacity needs. When you make a capacity decision prior to deploying an application, you often either end up sitting on expensive idle resources or dealing with limited capacity. With cloud computing, these problems go away. You can access as much or as little as you need, and scale up and down as required with only a few minutes notice
Increase speed and agility
In a cloud computing environment, new IT resources are only ever a click away, which means you reduce the time it takes to make those resources available to your developers from weeks to just minutes.This results in a dramatic increase in agility for the organization, since the cost and time it takes to experiment and develop is significantly lower.
Stop spending money on running and maintaining data centers
Focus on projects that differentiate your business, not the infrastructure. Cloud computing lets you focus on your own customers, rather than on the heavy lifting of racking, stacking and powering servers.
Go global in minutes
Easily deploy your application in multiple regions around the world with just a few clicks.This means you can provide a lower latency and better experience for your customers simply and at minimal cost.
The NIST Definition of Cloud Computing
NIST is responsible for developing standards and guidelines, including minimum requirements, for providing adequate information security for all agency operations and assets.
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.
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.
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)
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 data center).Examples of resources include storage,processing,memory, and network bandwidth.
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 anytime.
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.
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 user specific application configuration settings.
SaaS providers host an application and make it available to users through the internet, usually a browser-based interface. As the most familiar category of cloud computing,users most commonly interact with SaaS applications such as Gmail,Dropbox,Salesforce,or Netflix.
The capability provided to the consumer is to deploy onto the cloud infrastructure consumer-created or acquired applications created using programming languages,libraries, services,andtoolssupportedbytheprovider.3Theconsumerdoesnotmanageorcontrol 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.
PaaS solutions appeal to developers who want to spend more time coding,testing,and deploying their applications instead of dealing with hardware-oriented tasks such as managing security patches and operating system updates
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.
IaaS providers deploy and manage pre-configured and virtualized hardware and enable users to spin up virtual machines or computing power without the labor-intensive server management or hardware investments.
Amazon Web Services,for example,offers IaaS through the Elastic Compute Cloud,or EC2. Most IaaS packages cover the storage,networking,servers,and virtualization components, while IaaS customers are usually responsible for installing and maintaining the operating system,databases,security components,and applications
The cloud infrastructure is provisioned for exclusive use by a single organization comprising multiple consumers.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.
A private cloud is dedicated to a single organization.
Private cloud offers hosted services to a limited number of people behind a firewall, Private cloud also gives companies direct control over their data.
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.
A community cloud is a multi-tenant infrastructure that is shared among several organizations from a specific group with common computing concerns.
The community cloud can be either on-premises or off-premises, and can be governed by the participating organizations or by a third-party managed service provider.
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.
Computing resources,such as virtual machines(VMs), applications or storage, available to the general public over the internet.
It reduces the need for organizations to invest in and maintain their own on- premises IT resources.
It enables scalability to meet work load and user demands.
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 standardizedorproprietarytechnologythatenablesdataandapplicationportability(e.g., cloud bursting for load balancing between clouds).
Hybrid Cloud is combination of public and private cloud services with orchestration between the two.
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