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•First from the beginning when mainframes were
predicted to be the future of computing. Mainframes
and large scale machines were built and used, and in
some circumstances are used similarly today. The
trend, however, turned from bigger and more
expensive, to smaller and more affordable
commodity PCs and servers.
• Cloud computing refers to the many different
types of services and applications being delivered
in the internet cloud, and the fact that, in many
cases, the devices used to access these services and
applications do not require any special
• Cloud Software as a Service (SaaS).
• Cloud Platform as a Service (PaaS).
• Cloud Infrastructure as a Service (IaaS).
Software as a Service (SaaS)
•Essentially based on the concept of renting
application functionality from a service provider
rather than buying, installing and running software
• End-user application is delivered as a service.
Platform and infrastructure is abstracted, and can
deployed and managed with less effort.
Platform as a Service (PaaS).
Platform as a service (PaaS), which is all about
providing, a platform in the cloud, upon which
applications can be developed and executed. Google,
Salesforce.com (with Force.com), and Microsoft (with
Azure) exist in this space. Facilities provided include
things like database management, security, workflow
management, application serving, and so on.
Infrastructure as a Service (IaaS).
•The proposition here is the offering of computing power
•Physical infrastructure is abstracted to provide computing,
storage, and networking as a service, avoiding the expense
and need for dedicated systems.
• Consumers control and manage the systems in terms of
the operating systems, applications, storage, and network
connectivity, but do not themselves control the cloud
• Private Cloud
• Public Cloud
• Hybrid Cloud
• Community Cloud
Also referred to as internal cloud or on-premise cloud, the
cloud infrastructure that is managed and operated for one
organization only, primarily to maintain a consistent level
of control over security, privacy, and governance.
Essential characteristics of a private cloud typically include:
• Heterogeneous infrastructure
• Customized and tailored policies
• Dedicated resources
• In-house infrastructure
• End-to-end control
Also known as external cloud or multi-tenant cloud, this
model essentially represents a cloud environment that is
openly accessible. It generally provides an IT infrastructure in
a third-party physical data center that can be utilized to
deliver services without having to be concerned with the
underlying technical complexities.
Essential characteristics of a public cloud typically include:
• homogeneous infrastructure
• common policies
• shared resources and multi-tenant
• leased or rented infrastructure;
• economies of scale
The Hybrid Cloud or an Intercloud is not as much a
deployment model as it is a concept based on the
aggregation of deployed clouds. Just like the Internet, which
is a network of networks; intercloud refers to an inter-
connected global cloud of clouds. Also like the World Wide
Web, intercloud represents a massive collection of services
that organizations can explore and consume.
This deployment model typically refers to special-purpose
cloud computing environments shared and managed by a
number of related organizations participating in a common
domain or vertical market.
Issues In Cloud Computing
• Data Security
• Data Portability
• Legal Issues
• Cloud computing is the next big wave in computing. It has
many benefits, like better hardware management, since all
the computers are the same and run the same hardware. It
also provides for better and easier management of data
security, since all the data is located on a central server, so
administrators can control who has and doesn't have access
to the files.
• I hope you have learned a lot about cloud computing and the
bright future it has in the coming years.
To Be Continued…..