The Cloud computing technology is a new concept,which helps utilisation of server resources effectively. There are different ways one can become proficient in this skill. There are ways you can learn free of cost using online resources. But this method is not so effective for very beginners. The paid methods are very good and you can clarify your doubts in-time.
The below three methods help you get this skill quickly:
- Understanding what is cloud computing in questions and answers way
- Taking on-line video course. It takes very less time and it is more efficient
- Take class room coaching. This is also effective, if you can spend your valuable time on daily basis or 4 or 5 hours in weekend
- Download AWS free version and do practice with your laptop or desktop
Q.1)What is Cloud computing?
Cloud computing is a recently developing paradigm of distributed computing. Though it is not a new idea that emerged just recently. In 1969 L. Kleinrock anticipated, “As of now, computer networks are still in their infancy. But as they grow up and become more sophisticated, we will probably see the spread of ’computer utilities’ which, like present electric and telephone utilities, will service individual homes and offices across the country.”
Q.2) What is Cloud Technology?
Cloud is essentially provided by large distributed data centers. These data centers are often organized as grid and the cloud is built on top of the grid services. Cloud users are provided with virtual images of the physical machines in the data centers. This virtualization is one of the key concept of cloud computing as it essentially builds the abstraction over the physical system
Q.3) What are Cloud Services?
Cloud services are provided to the cloud users as utility services like water, electricity, telephone using pay-as-you-use business model. These utility services are generally described as XaaS (X as a Service) where X can be Software or Platform or Infrastructure etc. Cloud users use these services provided by the cloud providers and build their applications in the internet and thus deliver them to their end users. So the cloud users don’t have to worry about installing, maintaining hardware and software needed. And they also can afford these services as they have to pay as much they use. So the cloud users can reduce their expenditure and effort in the field of IT using cloud services instead of establishing IT infrastructure themselves.
Q.4) What is Cloud Hosting?
- SaaS (Software as a service) – Delivers a single application through the web browser to thousands of customers using a multitenant architecture. On the customer side, it means no upfront investment in servers or software licensing; on the provider side, with just one application to maintain, cost is low compared to conventional hosting. Under SaaS, the software publisher (seller) runs and maintains all necessary hardware and software. The customer of SaaS accesses the applications through Internet.
For example Salesforce.com with yearly revenues of over $300M, offers on-demand Customer Relationship Management software solutions. This application runs on Salesforce.com’s own infrastructure and delivered directly to the users over the Internet. Salesforce does not sell perpetual licenses but it charges a monthly subscription fee starting at $65/user/month . Google docs is also a very nice example of SaaS where the users can create, edit, delete and share their documents, spreadsheets or presentations whereas Google have the responsibility to maintain the software and hardware.
E.g. – Google Apps, Zoho Office.
- PaaS (Platform as a service) – Delivers development environment as a service. One can build his/her own applications that run on the provider’s infrastructure that support transactions, uniform authentication, robust scalability and availability. The applications built using PaaS are offered as SaaS and consumed directly from the end users’ web browsers. This gives the ability to integrate or consume third-party web-services from other service platforms.
E.g. – Google App Engine.
IaaS (Infrastructure as a Service) – IaaS service provides the users of the cloud
greater flexibility to lower level than other services. It gives even CPU clocks with OS level control to the developers.
E.g. – Amazon EC2 and S3.
Q.5) What are the uses of Cloud Servers?
- Cloud Providers’ point of view –
(a) Most of the data centers today are under utilized. They are mostly 15% utilized. These data centers need spare capacity just to cope with the huge spikes that sometimes get in the server usage. Large companies having those data centers can easily rent those computing power to other organizations and get profit out of it and also make the resources needed for running data center (like power) utilized properly.
(b) Companies having large data centers have already deployed the resources and to provide cloud services they would need very little investment and the cost would be incremental.
- Cloud Users’ point of view
(a) Cloud users need not to take care about the hardware and software they use and also they don’t have to be worried about maintenance. The users are no longer tied to some one traditional system.
(b) Virtualization technology gives the illusion to the users that they are having all the resources available.
(c) Cloud users can use the resources on demand basis and pay as much as they use. So the users can plan well for reducing their usage to minimize their expenditure.
(d) Scalability is one of the major advantages to cloud users. Scalability is provided dynamically to the users. Users get as much resources as they need. Thus this model perfectly fits in the management of rare spikes in the demand.