Maybe we ever heard about Cloud Computing, but do you know what is Cloud Computing?
Cloud Computing is a computing model / computing, where resources such as processor / computing power, storage, network, and software to be abstract and is given as service on the network / internet using remote access patterns. Model billing of services in general similar to a modem public service. Availability of on-demand according to the needs, easy to control, dynamic and almost without limit scalability are some of the important attributes of the cloud computing. A model of cloud computing infrastructure setup is usually recognized as the ‘Cloud’.
Here is some categories of services are available from the ‘Cloud’ as:
• Infrastructure As A Service (IAAS)
• Platform As A Service (PAAS)
• Software As A Service (SAAS)
‘Cloud’ is usually provided as a service to anyone on the Internet. However, variants in called ‘Private Cloud’ increasingly popular for private infrastructure / private attribute that has like ‘Cloud’ above. Cloud computing is different from Grid computing or Parallel Computing, Grid computing where and Parallel computing is more a part of the physical infrastructure for the provision of Cloud computing concept.
- Infrastructure As A Service (IAAS)
In this most basic cloud service model, cloud providers offer computers – as physical or more often as virtual machine –, raw (block) storage, firewalls, load balancers, and networks. IaaS providers supply these resources on demand from their large pools installed in data centers. Local area network including IP addresses are part of the offer. For the wide area connectivity, the Internet can be used or – in carrier clouds – dedicated virtual private networks can be configured.
To deploy their applications, cloud users then install operating system images on the machines as well as their application software. In this model, it is the cloud user who is responsible for patching and maintaining the operating systems and application software. Cloud providers typically bill IaaS services on a utility computing basis, that is, cost will reflect the amount of resources allocated and consumed.
Infrastructure-as-a-Service or IaaS Cloud is a platform through which businesses can avail equipment in the form of hardware, servers, storage space etc. at pay-per-use service.
Moreover, IaaS is a branch of cloud computing that has gathered attention among the entrepreneurs largely with the prime motive to make their business environments more organized and in sync with the ongoing operational activities of organizations.
When we talk about IaaS functioning, it is not a machine that we are talking about, which does all the work, it is simply a facility given to the business enterprises that offers users the leverage of extra storage space in servers and data centers.
- Platform As A Service (PAAS)
In the PaaS model, cloud providers deliver a computing platform and/or solution stack typically including operating system, programming language execution environment, database, and web server. Application developers can develop and run their software solutions on a cloud platform without the cost and complexity of buying and managing the underlying hardware and software layers. With some PaaS offers, the underlying compute and storage resources scale automatically to match application demand such that cloud user does not have to allocate resources manually.
- Software As A Service (SAAS)
In this model, cloud providers install and operate application software in the cloud and cloud users access the software from cloud clients. The cloud users do not manage the cloud infrastructure and platform on which the application is running. This eliminates the need to install and run the application on the cloud user’s own computers simplifying maintenance and support. What makes a cloud application different from other applications is its elasticity. This can be achieved by cloning tasks onto multiple virtual machines at run-time to meet the changing work demand. Load balancers distribute the work over the set of virtual machines.
This process is inconspicuous to the cloud user who sees only a single access point. To accommodate a large number of cloud users, cloud applications can bemultitenant, that is, any machine serves more than one cloud user organization. It is common to refer to special types of cloud based application software with a similar naming convention: desktop as a service, business process as a service, Test Environment as a Service, communication as a service.
The pricing model for SaaS applications is typically a monthly or yearly flat fee per user.
- Cloud Clients
Users access cloud computing using networked client devices, such as desktop computers, laptops, tablets and smartphones. Some of these devices – cloud clients – rely on cloud computing for all or a majority of their applications so as to be essentially useless without it. Examples are thin clients and the browser-basedChromebook. Many cloud applications do not require specific software on the client and instead use a web browser to interact with the cloud application. With Ajax andHTML5 these Web user interfaces can achieve a similar or even better look and feel as native applications. Some cloud applications, however, support specific client software dedicated to these applications (e.g., virtual desktop clients and most email clients). Some legacy applications (line of business applications that until now have been prevalent in thin client Windows computing) are delivered via a screen-sharing technology.