Here are the slides for my Autumn 2013 guest lectures on Cloud Computing for the Computer Science department at Loughborough University. I cover infrastructure, platform and software as a service - with some illustrative examples - and talk about opportunities for Computer Scientists to get involved in Cloud Computing.

1. Cloud Computing
Demystified
Photo credit: Flickr user iLighter

2. Picture credit: Google
Themes
1. What is Cloud Computing?
2. Why would I want to use it?
3. Where is “The Cloud” anyway?
4. Dark Clouds and Silver Linings

3. Picture credit: Google
Themes
1. What is Cloud Computing?
2. Why would I want to use it?
3. Where is “The Cloud” anyway?
4. Dark Clouds and Silver Linings

4. 1. What is Cloud Computing?
- Utility computing
- Ready made appliances and
services, just “plug in” and go
- Started out as spare cycles
and platform APIs from
Amazon
- Now open competition from
Google, Microsoft, and others
- IT spend as opex, not capex
- Pay as you go

5. - Infrastructure as a Service (IaaS)
- Bring Your Own OS, software, etc
- Public, private, hybrid clouds
- Platform as a Service (PaaS)
- APIs and standards to code against, e.g. storage,
database, IP load balancer
- Software as a Service (SaaS)
- Typically admin dashboard, application level APIs
and user facing Web services
1. What is Cloud Computing?

6. - Infrastructure as a Service (IaaS)
- Bring Your Own OS, software, etc
- Public, private, hybrid clouds
- Platform as a Service (PaaS)
- APIs and standards to code against, e.g. storage,
database, IP load balancer
- Software as a Service (SaaS)
- Typically admin dashboard, application level APIs
and user facing Web services
1. What is Cloud Computing? IaaS

7. Picture credit: GooglePicture credit: Google
1. What is Cloud Computing? IaaS

8. Picture credit: Google
1. What is Cloud Computing? IaaS
Picture credit: Google

9. 1. What is Cloud Computing? IaaS

10. Picture credit: University of Stanford Infolab
1. What is Cloud Computing? IaaS

11. Opportunities:
- Capacity planning needed to assess
resource for move into the cloud
- Server virtualization expertise
- Data centre design and build
- Sysadmins to run operating
systems, install and maintain software etc
- Hot topic: Live migration of workloads
1. What is Cloud Computing? IaaS

12. Picture credit: Dell
1. What is Cloud Computing? IaaS

13. Picture credit: Stephen Shankland, CNET
1. What is Cloud Computing? IaaS

14. - Infrastructure as a Service (IaaS)
- Bring Your Own OS, software, etc
- Public, private, hybrid clouds
- Platform as a Service (PaaS)
- APIs and standards to code against, e.g. storage,
database, IP load balancer
- Software as a Service (SaaS)
- Typically admin dashboard, application level APIs
and user facing Web services
1. What is Cloud Computing?

15. 1. What is Cloud Computing? PaaS

16. 1. What is Cloud Computing? PaaS

17. 1. What is Cloud Computing? PaaS
Opportunities:
- Building APIs and
data models
- Developing and
extending existing
open source code,
e.g. Hadoop
- Writing applications against these APIs, e.g.
Google App Engine, Amazon Web Services
- Selling cloud applications, e.g. Google Apps
Marketplace

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'requestScheme' => Zend_Oauth::REQUEST_SCHEME_HEADER,
'version' => '1.0',
'signatureMethod' => 'HMAC-SHA1',
'consumerKey' => $CONSUMER_KEY,
'consumerSecret' => $CONSUMER_SECRET
);
$config = new Zend_Oauth_Consumer($options);
$token = new Zend_Oauth_Token_Access();
$httpClient = $token->getHttpClient($options);
$client = new Zend_Gdata_Docs($httpClient);
$feed = $client->getDocumentListFeed(
'https://docs.google.com/feeds/documents/private/full?xoauth_requestor_id=' .
urlencode($email_address));
foreach ($feed->entries as $entry) {
$title = $entry->title;
# etc
}
1. What is Cloud Computing? PaaS

19. - Infrastructure as a Service (IaaS)
- Bring Your Own OS, software, etc
- Public, private, hybrid clouds
- Platform as a Service (PaaS)
- APIs and standards to code against, e.g. storage,
database, IP load balancer
- Software as a Service (SaaS)
- Typically admin dashboard, application level APIs
and user facing Web services
1. What is Cloud Computing?

20. 1. What is Cloud Computing? SaaS

21. 1. What is Cloud Computing? SaaS

22. 1. What is Cloud Computing? SaaS

23. Opportunities:
- Migration assistance
- Systems integration, e.g. use APIs to
import/export data
- Day-to-day administration
- Use APIs to extend existing services, e.g.
Gmail contextual gadgets
- Develop new SaaS offerings
- It's just a website, really :-)
1. What is Cloud Computing? SaaS

24. 1. What is Cloud Computing? SaaS

25. Picture credit: Google
Themes
1. What is Cloud Computing?
2. Why would I want to use it?
3. Where is “The Cloud” anyway?
4. Dark Clouds and Silver Linings

26. 2. Why use it?
- Provision service rapidly
- Flexibility over scaling
- Reduce headcount, power
bill, cooling requirements
- Convert capital expenditure
into operating expenditure
- Concentrate on stuff that
genuinely adds value

27. 2. Why use it?
- Provision service rapidly
- Flexibility over scaling
- Reduce headcount, power
bill, cooling requirements
- Convert capital expenditure
into operating expenditure
- Concentrate on stuff that
genuinely adds value

28. 2. Why use it? Value Stream Map

29. Picture credit: Google
Themes
1. What is Cloud Computing?
2. Why would I want to use it?
3. Where is “The Cloud” anyway?
4. Dark Clouds and Silver Linings

30. Video credit: Google
http://youtu.be/avP5d16wEp0
3. Where is “The Cloud” anyway?

31. Video credit: Google
3. Where is “The Cloud” anyway?

32. Slide credit: Phil Richards
3. Where is “The Cloud” anyway?

33. Slide credit: Phil Richards
3. Where is “The Cloud” anyway?

34. Picture credit: Google
Themes
1. What is Cloud Computing?
2. Why would I want to use it?
3. Where is “The Cloud” anyway?
4. Dark Clouds and Silver Linings

35. 4. Dark Clouds and Silver Linings
Slide credit: NSA
“United Rake, Peddle Cheap,
Packet Wrench, and Beach
Head – all delivered from a
FOXACID Subsystem called
Ferret Cannon”
- Trust issues

36. 4. Dark Clouds and Silver Linings
Image credit: NSA
“United Rake, Peddle Cheap,
Packet Wrench, and Beach
Head – all delivered from a
FOXACID Subsystem called
Ferret Cannon”
- Trust issues
- Who watches the watchers?
- Industrial espionage

37. Photo licensed under a Creative Commons Attribution-ShareAlike 2.5
License, from angrykeyboarder
4. Dark Clouds and Silver Linings

38. Richard Stallman:
- GNU Emacs
- GNU make
- gcc / gdb
- Copyleft / GPL
Photo licensed under a Creative Commons Attribution-ShareAlike 2.5
License, from angrykeyboarder
4. Dark Clouds and Silver Linings

39. "If you use a proprietary
program or somebody
else's web
server, you're
defenceless. You're
putty in the hands
of whoever developed
that software."
Photo licensed under a Creative Commons Attribution-ShareAlike 2.5
License, from angrykeyboarder
4. Dark Clouds and Silver Linings

40. Picture credit: rptech-world.com
4. Dark Clouds and Silver Linings

41. Picture credit: rptech-world.com
4. Dark Clouds and Silver Linings

42. Linux, by Linus Torvalds and a cast
of thousands, powers:
- Google, Amazon,
Facebook, eBay etc
- Your TV, set top box, wireless
router,
- 1 billion Android phones and
tablets
Picture credit: rptech-world.com
4. Dark Clouds and Silver Linings

43. Video credit: Linux Foundation
http://youtu.be/5ocq6_3-nEw
4. Dark Clouds and Silver Linings

44. Cloud Computing
Demystified
Photo credit: Flickr user iLighter