Cloud Computing
AMOS KUJENGA
ADLSN Training Coordinator
akujenga@gmail.com
Addis Ababa, Ethiopia
5 – 7 November 2014
Outline of Presentation





Definition
Types of Cloud Services
Examples
Facts
Pros and Cons
1. 1 Cloud Computing Defined
“Cloud” is a metaphor for the Internet.
“Cloud Computing” is a modern
phrase commonly used today to refer
to the act of storing, accessing, sharing
data, applications, and computing
power over the Internet, in other
words in cyberspace. (ANDERSON &
RAINIE, 201)
1.1 Cloud Computing Defined
 “Cloud
Computing” is when computing is
delivered as a service rather than a product
◦Computing services are made available to
computers and other devices over a network
such as the Internet
◦On-demand access can be rapidly given with
minimal service provider interaction
1.2 Types Of Cloud Services
Software as a Service
(SaaS)
Platform as a Service
(PaaS)
Infrastructure as a
Service (IaaS)
1.21 Software as a Service (SaaS)
A software distribution model in which
off-the shelf applications are hosted by a
vendor or service provider and made
available to customers over a network,
typically the Internet.
 Is the simplest form of cloud computing
 Innovative Sierra, WorldCat

1.22 Platform as a Service (SaaS)
Cloud based platform, services, and tools
for creating and hosting SaaS applications
 Allows users to create their own
applications using supplier-specific tools
and languages
 Risk of vendor lock-in
 Google App Engine, Windows Azure

1.23 Infrastructure as a Service
(SaaS)




AKA Hardware as a Service (HaaS)
Virtual computer and infrastructure services
in the cloud for hosting traditional software
applications
Allows users to run any applications they
please on cloud hardware of their own
choice
Amazon Elastic Compute Cloud (EC2),
Amazon Simple Storage Service (Amazon
S3)
1. 3 Cloud Computing Examples
Category
Example
Office Applications
Google Docs, MS Office 365
Mailing Services
Gmail, Yahoo, Zimbra
Storing Services
DropBox
Software and Applications
Hosted repositories
Video and Presentation Services
YouTube, SlideShare, Prezi
File Sharing Services
DropBox
Calendar Services
Google Calendar
Social Networking
Facebook, Google+
1. 3 Cloud Computing Examples
Hosted Versus Non-Hosted DLs
1. 3 Cloud Computing Examples
Hosted Repositories
1. 3 Cloud Computing Examples
Hosted Repositories
1.4 Cloud Computing Facts
Mobile technology is driving people to
cloud-based services, killing the PC
market
 The exponential increase in access to the
Internet is also a major player
 Social networking sites are the most
popular cloud-based services
 Less staff focus on IT issues, more focus
on service delivery

1.4 Cloud Computing Facts

Support by service providers as opposed
to IT staff
1.5 Cloud Computing Pros








No upfront investment in hardware and/or
software
Anywhere, anytime access to data and
services
Increased reliability (subject to debate)
Ease of data sharing
Provide backup to locally stored data
Ease of collaborative working
Services can be provisioned in minutes
Scalable (add capacity as needed, no old
assets)
1.6 Cloud Computing Cons
Security concerns
 Privacy concerns
 Greater depence on external forces

◦ Loss of local control
◦ Vendor lock-in
Requires constant high-speed Internet
access
 “Forces” use of high-end devices
