Platform as a Service (PaaS)

PaaS in Cloud Computing
• Includes services for developing
and deploying applications.
• It is an abstracted and integrated
cloud-based computing
environment that supports the
development, running, and
management of applications.
• A primary value of a PaaS
environment is that developers
don’t have to be concerned with
some of the lower-level details of
the environment. You can look at
a software stack as a pyramid:

What is PaaS ?
• PaaS, is a category of cloud computing that provides a platform and environment
to allow developers to build applications and services over the Internet.
• A “cloud aware” application development and deployment environment.
• An abstraction layer between your cloud application and your IaaS provider.
• PaaS services are hosted in the cloud and accessed by users simply via their web
browser.
• Fundamentally provides elastic scaling of your application.
• Deployments include public, private and hybrid cloud configurations.
• Example PaaS services:
 Data services,
 Application runtime,
 Messaging & queueing,
 Application management.

PaaS
• Platform as a Service (PaaS) is a way to rent hardware, operating
systems, storage and network capacity over the Internet.
• The service delivery model allows the customer to rent virtualized
servers and associated services for running existing applications or
developing and testing new ones.
• It is an outgrowth of SaaS, a software distribution model in which
hosted software applications are made available to customers over
the Internet.

PaaS Goal
• Create an abstracted environment that supports an efficient, cost-effective,
and repeatable process for the creation and deployment of high-quality
applications.
• Focus on Development, not Ops
• Programmers’ development environment
• Presentation layer: HTML, CSS, JavaScript
• Control layer: Web Server code
• Data layer: Data Model
• Optionally, analytics
• Ops below
• Made visible through a web interface
• Operating system
• File system
• User authentication
• Utilities (cron, etc.)
• Logs
• Database maintenance, backups, etc.

How PaaS works
• Platform as a Service allows users to create software applications
using tools supplied by the provider.
• PaaS services can consist of preconfigured features that customers
can subscribe to; they can choose to include the features that meet
their requirements while discarding those that do not.
• The infrastructure and applications are managed for customers and
support is available.
• Services are constantly updated, with existing features upgraded and
additional features added.

PaaS does that
• PaaS enables an organization to do the following:
• Leverage key middleware services without having to deal with the
complexities of managing individual hardware and software
elements.
• Access a complete stack of development and deployment tools via a
web browser, a middleware environment where APIs can be used to
plug into selected development and deployment tools. A developer
might also leverage a full desktop development environment.
• Overcome the challenges of managing lots of individual development
and deployment tools by providing a suite of integrated and
standardized tools — operating systems, security products, and the
like — that meet company requirements.

Payment
• As with most cloud offerings, PaaS services are generally paid for on a
subscription basis with clients ultimately paying just for what they
use.
• Clients also benefit from the economies of scale that arise from the
sharing of the underlying physical infrastructure between users, and
that results in lower costs.

PaaS offers
• Below are some of the features that can be included with a PaaS
offering:
• Operating system
• Server-side scripting environment
• Database management system
• Server Software
• Support
• Storage
• Network access
• Tools for design and development
• Hosting

Who can use PaaS services?
• Software developers, web developers and businesses can benefit
from PaaS.
• For example, web developers can use individual PaaS environments
at every stage of the process to develop, test and ultimately host their
websites. However, businesses that are developing their own internal
software can also utilise Platform as a Service, particularly to create
distinct ring-fenced development and testing environments.

Seperation of Duties
• Development and infrastructure teams often clash when building
software.
• Ideally, there is a clear separation of duties and clean handoffs.

Evolving from different standards
• Evolving “upwards” from IaaS
• Amazon (Mail, Notification, Events, Databases, Workflow, etc.)
• Evolving “downwards” from SaaS
• Force.com – a place to host additional per-tenant logic.
• Google App Engine
• Evolving “sideways” from middleware platforms
• WSO2, Tibco, vmWare, Oracle, IBM

Deployment System
• Methods for continuous deployment
• Upload
• Version management

What do I care about (As a developer) ?
• My code – running
• Not a “VM” but a Virtual App Server
• Not just code
• I like Queues and Topics, ESB flows, Workflows, Databases, Logs, Portals, etc.
• Not just Runtime
• I like SVN, Git, build, continuous integration, code coverage, automated test
• Moreover, if you are a manager of a group of developers, you
probably like governance.

Beginning to use PaaS
• One of the decisions you need to make when beginning to use a PaaS
is whether you want to maintain the software or if you want the
vendor to be the administrator.

Maintain the software yourself
• If you choose to maintain the software yourself, you must set up,
configure, maintain, and administer the PaaS yourself (either on a
public or private cloud).

Let the vendor be the administrator
• Alternatively, you can have the vendor to provide these services. The
result is reduced friction between the development and deployment
teams. There will, of course, be situations in which it’s critical for the
internal team to control and manage a complex software
environment.

Best Practices
• Start with the data, and work up to the services and UI. No matter
what the PaaS provider suggests.
• Define a staging and testing strategy before you begin development.
• Consider SOA approaches in the design and deployment of the PaaS-
bases application.
• Make sure to do load testing along with functional testing.
• Make sure to model performance.
• Don’t fall in love with a PaaS player, you may need to use several.

Primary Benefits of PaaS
• Lower development costs (%30+)
• Lower deployment and DevOps costs (Nearly eliminate)
• Application portability (depends on the PaaS)

Benefits for Developers
• Below are some of the benefits of PaaS to application developers:
• They don’t have to invest in physical infrastructure (being able to ‘rent’ virtual infrastructure)
• They don’t have to be concerned with some of the lower-level details of the
environment.
• Makes development possible for ‘non-experts’
• Flexibility
• Adaptability
• Teams in various locations can work together
• Security

Platform as a Service (PaaS)

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