This document defines and explains cloud computing. It begins by defining cloud and computing separately, then combining the terms to explain cloud computing as computing done over the Internet. It describes how cloud computing differs from conventional computing by being distributed across networks rather than done locally. The document also defines the three main types of cloud computing: Infrastructure as a Service (IaaS), Platform as a Service (PaaS), and Software as a Service (SaaS). It provides examples to illustrate each type and explains their relationship. Additional advantages and applications of cloud computing are discussed.

1. CLOUD COMPUTING
Mohammad Hafiz Ismail
mypapit@gmail.com
http://www.perlis.uitm.edu.my/hafiz/
https://blog.mypapit.net/

2. What is Cloud Computing ?
CLOUD
o Networking term – refers to public or semi public space
on transmission lines
o Shared space, refers to area to whom no one in
particular controls , usually refers to the Internet
COMPUTING
o The use or operation of computers
o Process of utilizing computer
technology to complete a task

3. Cloud Computing
CLOUD + COMPUTING
Computing done over the Internet !

4. Cloud Computing
Conventional Computing
CONVENTIONAL COMPUTING ?
o Where all the work are done locally and
on the desktop
o Hardware and software sits on the office
workplace
o Processing work are done individually

5. Cloud Computing
Conventional Computing
CLOUD COMPUTING ?
o Actual computing work are done on the
‘cloud’
o Distributed across the network, to several
computers
o Which may be operated by service
provider

6. Cloud Computing
Conventional Computing
(Individual Processing)
Cloud Computing
(Massive Processing)
2 x 2.4 GHz CPU
8 GB RAM
ANALYZING 240 TB DATA
2 x 2.4 GHz CPU
8 GB RAM
2 x 2.4 GHz CPU
8 GB RAM
2 x 2.4 GHz CPU
8 GB RAM
16 CPU, 64 GB
RAM

7. Cloud Computing
“The whole is more than
sum of its parts”

8. Cloud Computing Users
Gmail Service Features
o Offers 15 GB storage Space
o 2,000 – 3,000 sign-ups per day
o 5000 TB data transfer per day
Compare
o If UiTM Perlis has 8,000 users
o 15 GB x 8,000
o 120,000 GB data
o Where can you get hard disk
that massive?

9. Cloud Computing Users

10. Cloud Computing as a Service
o Cloud Computing involves delivering hosted
services over the internet
o These services are broadly divided into
THREE(3) categories:
o Infrastructure-as-a-Service (IaaS)
o Platform-as-a-Service (PaaS)
o Software-as-a-Service (SaaS)

11. Why all these are
offered “as-a-service” ??
“Why do we need to hire/rent/lease
these hosted cloud services?”
“We could better run our own cloud
infrastructure ourselves?”

12. Why we need to rent/lease Cloud
Service ?
o Imagine we’re running a business office
o The office may require overhead / maintenance
o Washroom/Toilet Cleaning
o Electrical works
(what if air-conditioning does not work?)
o Security / Safeguards
o We can either maintain these ourselves or, we
can hire specialist in the field
o Advantage: We could concentrate on expanding
our Business

13. Why we need to rent/lease Cloud
Service ?
o The same concept also applies on
renting/leasing Cloud Computing Service
o Instead of spending time maintaining,
upgrading hardware & software which may
cost TIME and MONEY,
o We can concentrate our time on offering
better products to our stakeholders
o Let the specialist handle the
infrastructure

14. IaaS, PaaS & SaaS ?
Three general type of Cloud Computing
o Infrastructure-as-a-Service (IaaS)
o Platform-as-a-Service (PaaS)
o Software-as-a-Service (SaaS

15. Infrastructure as a Service (IaaS)
Infrastructure as a Service (IaaS) is a form of
cloud computing that provides virtualized
computing resources over the Internet
oCPU / Processing time
oMemory / RAM
oStorage

16. Platform-as-a-Service (PaaS)
o PaaS is a cloud model in which providers deliver
apps over the Internet and host users' hardware
and software on their infrastructure
o Sits between SaaS and IaaS
o Sometimes called “Container”
o Windows Azure
o OpenStack
o Docker
o Google App Engine

17. Software-as-a-Service (SaaS)
o Software as a Service provides network-based
access to networked-based software
o If you use the internet, you might already use
one of these SaaS
o Google Docs
o I-Learn / Moodle / Padlet
o Shazaam
o Salesforce
o Microsoft Office 360
o Wolfram-Alpha

18. Relationship between IaaS, PaaS and
SaaS

19. Relationship between IaaS, PaaS and
SaaS

20. Cloud Computing is not…
oMerely a buzzword
o Act of storing files on the remote computer
oMerely a one-to-many client-server network

21. Cloud Computing Advantages
o Provides Business Process Abstraction
o Simplifies Maintenance
o Separates Roles
o Provides Redundancy
o Offer better protection from DDoS / Attacks

22. CLOUD COMPUTING
Mohammad Hafiz Ismail
CCMSE 2015

23. Further Reading
1. http://www.ibm.com/developerworks/cloud/
about.html
2. http://www.rackspace.com/knowledge_cent
er/whitepaper/understanding-the-cloud-
computing-stack-saas-paas-iaas
3. http://www.computerweekly.com/photostor
y/2240109268/The-Computer-Weekly-guide-
to-Cloud-Computing/2/The-difference-
between-Saas-Paas-and-Iaas