Question

• In your own words explain the difference between two types of cloud computing: Platform as a service (PaaS) and .Infrastructure as a service (IaaS). Give at least 2 examples of PaaS and 1 example of IaaS AWS solutions implemented by Zillow. Describe main features and benefits of each .

Answer 1

Platform as a service (PaaS)

Cloud platform services is additionally referred to as Platform as a Service (PaaS) which offer cloud components to certain software while being employed mainly for applications. PaaS delivers a framework for developers that they'll build on and use to form customized applications. All servers, storage, and networking is managed by the enterprise or a third-party provider while the developers can maintain management of the applications.

Fetures of PaaS:

• It is simple, cost-effective development and deployment of apps.
• PaaS is scalable.
• PaaS is highly available.
• In PaaS developers can customize apps without the headache of maintaining the software
• It give significant reduction in the amount of coding needed.
• Automation of business policy.
• Easy migration to the hybrid model.

Examples of PaaS ::: AWS Elastic Beanstalk, Windows Azure, Heroku, Force.com, Google App Engine, and OpenShift.

Infrastructure as a service (IaaS)

Cloud infrastructure services is additionally referred to as Infrastructure as a Service are made of highly scalable and automated compute resources and is fully self-service for accessing and monitoring computers, networking, storage, and other services. Infrastructure as a Service allows businesses to purchase resources on-demand and as-needed instead of having to buy hardware outright.

Features of IaaS:

• In SaaS resources are available as a service.
• Here cost varies depending on the consumption.
• In SaaS services are highly scalable.
• Here multiple users can work on a single piece of hardware.
• Organization retain complete control of the infrastructure.
• SaaS is dynamic and flexible.

Examples of IaaS ::: DigitalOcean, Linode, Rackspace, Amazon Web Services (AWS), Cisco Metacloud, Microsoft Azure, and Google Compute Engine (GCE).

A good example of IaaS is AWS EC2.

EC2 provides scalable infrastructure for companies who want to host cloud-based applications.

EC2 users do not own the physical server, AWS provides virtual servers.

IaaS	PaaS
♣A service model in cloud computing that provides virtualised computing resources over the internet.	♣A cloud computing model that deliver tools necessary for application development over the internet.
♣IaaS is used by System Administrator.	♣PaaS is used by Developer.
♣User get virtual data center to store information and create platform for services and app development, testing and deployment.	♣User get virtual platform and tools to create, test,deploy apps and services.
♣Servers, storage, networking and vertualisation is under the control of Provider.	♣Servers, storage, networking and vertualisation as well as operating system, middlewareand runtime is also under the control of the provider
♣Operating system, middleware,runtime and data is under the control of the User.	♣Application and data is only in under control of the User.

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