Comprehensive Information on Platform as a Service

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Comprehensive Information on Platform as a Service
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Table of Contents

• The Cloud
• Cloud Service Models
• Platform as a Service (PaaS)
• PaaS Delivery
• PaaS Characteristics
• PaaS Advantages
• When to Use PaaS

• PaaS Challenges
• Integration
• Customization of Legacy Systems
• Operational Limitation
• Vendor Lock-in
• Runtime Issues
• Data Security

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The Cloud

• A cloud refers to those servers that are
  accessible over the Internet as well as the
  databases and the software that run on such
  servers. Cloud servers exist in data centers.
  Companies and users dont need to manage physical
  servers when they use cloud computing. They dont
  have to run software applications either on their
  machines for cloud computing. Any device
  connected to the Internet can be used to access
  the same files and applications with the aid of
  cloud computing. The cloud offers the benefits of
  enhanced scalability and functionality along with
  cost savings.
• Cloud technology is used in cloud hosting, which
  is a type of web hosting service. Web hosting
  makes websites accessible over the Internet. This
  service is provided by website hosting companies
  and it can be of different types, such as shared,
  dedicated, reseller, VPS, cloud, WordPress etc.
  The terms Windows Shared Web Hosting, Linux
  Dedicated Hosting, Linux Reseller Hosting
  refer to different types of web hosting services.

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Cloud Service Models

• YELLOW
• Cloud service models are of three types which are
  distinctly different from each other. These are
  capable of forming a comprehensive cloud service
  model by interacting with each other. The three
  types of cloud service models are mentioned
  below-
• Infrastructure as a Service (IaaS)
• Platform as a Service (PaaS)
• Software as a Service (SaaS)
• Platform as a Service (PaaS) will be the focus of
  the content of the following slides.

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Platform
as a Service (PaaS)

• Platform as a service (PaaS) is a category
  of cloud service models. It provides
  the platform to customers for developing,
  running, and managing applications without having
  to deal with the complexity of building as well
  as maintaining the infrastructure that is
  typically needed for developing and launching
  applications.
• PaaS vendors provide all the necessary
  development tools, infrastructure and the
  operating systems over the Internet that are
  needed for building an application.
• Examples of PaaS are Windows Azure, AWS Elastic
  Beanstalk, Force.com, OpenShift, Google App
  Engine and Heroku.

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PaaS Delivery
PaaS can be delivered in three ways. These are
mentioned below. It can be delivered by a
provider as a public cloud service. The consumer
controls the deployment of software in it with
minimal configuration options. The networks,
servers, database, storage, operating system
(OS), middleware and other relevant services are
provided by the provider for hosting the
application of the consumer PaaS can be delivered
as a private service behind a firewall It can be
delivered as a software that is deployed on a
public infrastructure as a service or the Top
Cloud Hosting Company.
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PaaS Characteristics

• YELLOW
• The main characteristics of PaaS, which define it
  as a cloud service, are as follows-
• Built on virtualization technology. Hence,
  resources can be scaled up or down very easily as
  per business requirements
• Integrates databases and web services
• Provides many services that aid with the
  development, testing as well as the deployment of
  apps
• Many users can access it through the same
  development application

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PaaS Advantages

• YELLOW
• Regardless of the size of an organization, PaaS
  offers numerous advantages. These are mentioned
  below.
• It is scalable
• It makes development and deployment of apps easy
  as well as cost-effective
• It has high availability
• It ensures automation of business policy
• It reduces the need for coding significantly
• Apps can be customized by developers without
  being bothered about software maintenance
• It makes it easy to migrate to a hybrid model

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• Whoa! Thats a big number, arent you proud?

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When to Use PaaS

• YELLOW
• PaaS can be used to streamline workflows in the
  event that many developers are working on the
  same project. If other vendors are included, then
  the entire process can benefit from the enhanced
  speed and flexibility that it provides. It is
  especially beneficial when there is a need for
  the creation of customized applications. PaaS can
  be used when there is a requirement to reduce
  costs considerably and do away with the
  challenges that are encountered while developing
  or deploying an app quickly.

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PaaS Challenges
PaaS presents certain challenges with regard to
data security, vendor lock-in, integration,
runtime issues, operational limitations and
customization of legacy systems. These will be
discussed in more detail in the following slides.
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Integration
There is an increase in the complexity with
regard to connecting the data of an onsite data
center and an off-premise cloud. Integration with
the existing services as well as infrastructure
can be challenging when not all the components of
a legacy IT system are built for the cloud.
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Customization of Legacy
Systems
Many customizations and changes in configuration
might be needed in order to ensure that legacy
systems work perfectly with PaaS service. Such a
customization can give rise to a complex IT
system.
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Operational Limitation
Cloud operations that are customized and have
management automation workflows might not apply
to PaaS solutions. This is because the platform
usually limits end users operational
capabilities. This loss of operational control
might affect the way in which PaaS solutions are
provisioned, operated and managed.
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Vendor Lock-in
The requirements and the reasons that result in
choosing a specific PaaS solution and/or vendor
might change in the future. If the existing
vendor doesnt have convenient migration
policies, opting for some other PaaS vendor might
become challenging and it might impact ones
business.
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Runtime Issues
PaaS solutions might not be optimized for
frameworks of ones choice. There might be a lack
of availability with regard to specific framework
versions or these might perform optimally with
the PaaS service. It might not be possible for
customers to develop custom dependencies with the
platform.
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Data Security
Organizations that use PaaS solutions have data
in third-party cloud servers that are controlled
by the respective vendors. This can lead to
security risks and give rise to concerns.
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