SUNY FARMINGDALEComputer Programming & Information Systems

BCS451 – Cloud ComputingProf. Tolga Tohumcu

Introduction to Cloud Computing

Cloud computing is the use of computing resources (hardware and software) that are delivered as a service over a network (typically the Internet). Cloud computing entrusts remote services with a user's data, software and computation.

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“Cloud“ used as a metaphor for the Internet, based on the cloud drawing used in the past to represent the telephone network; later to depict the Internet in computer network diagrams as an abstraction of the underlying infrastructure it represents.

Details abstracted from end-users, who no longer have need for expertise in, or control over, the technology infrastructure "in the cloud" that supports them.

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Private cloud enterprise owned or leased

Public cloud Sold to the public, mega-scale infrastructure

Hybrid cloud composition of two or more clouds

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Cloud computing often leverages: Massive scale Homogeneity Virtualization Resilient computing Low cost software Geographic distribution Service orientation Advanced security technologies

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Cloud Infrastructure

IaaS

PaaS

SaaS

Infrastructure as a Service (IaaS) Architectures

Platform as a Service (PaaS)Architectures

Software as a Service (SaaS)

Architectures

Cloud Infrastructure

SaaS

Cloud Infrastructure

PaaS

SaaS

Cloud Infrastructure

IaaS

PaaS

Cloud Infrastructure

PaaS

Cloud Infrastructure

IaaS

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Cloud Service Models

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IaaS: Infrastructure as a Service provisions computing resources within provider's infrastructure

upon which they can deploy and run arbitrary software, including OS and applications.

• PaaS: Platform as a Service can create custom applications using programming tools

supported by the provider and deploy them onto the provider's cloud infrastructure.

SaaS: Software as Service use provider’s applications running on provider's cloud

infrastructure.

SaaS

PaaS

IaaS

Amazon Google Microsoft Salesforce

Examples

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Also called an Internal cloud or enterprise cloud Offers activities and functions "as a service" but is

deployed over a company intranet or hosted datacenter.

Advance security and highly available or fault tolerant solutions not possible in a public cloud.

Availability of the IT infrastructure to avoid risk of a major failure.

Pay-back is fundamentally driven by consolidation from many stand-alone servers and devices to fewer devices running many virtual machines.

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Also known as a shared cloud, such services are provided "as a service" over the Internet with little or no control over the underlying technology infrastructure.

This cloud is appealing to many decision-makers as it reduces complexity and long lead times in testing and deploying new products. It is generally cheaper, too.

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This is an integrated approach, combining the power of both public and private clouds.

Customized rules and policies govern areas such as security and the underlying infrastructure.

Activities and tasks are allocated to internal or external clouds as required.

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Company XYZ wants to move to a cloud. First we need to understand that one Cloud may not fit all, and therefore the type of Cloud decision has to be per solution, or per software, or per business process (for example email, or a payroll application). The next step for each is to ask the following questions:

What SLA do I need? (Availability, backup, retention, etc…) Regulations / Compliance (PCI, security, etc…) Predictability of the Solution (How predictable it is, capacity

planning)

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WHAT IS VIRTUALIZATION? Virtualization is a technology that

allows you to transform your hardware into software

Virtualization allows you to run multiple OS’s simultaneously on a single computer

Virtualization is not: Simulation Emulation

Any questions?