An Introduction to Clouds
Presented by: Prof Mark Baker
ACET, University of Reading
Tel: +44 118 378 8615
E-mail: Mark.Baker@computer.org
Web: http://acet.rdg.ac.uk/~mab
March 24, 09
mark.baker@computer.org
What is Cloud Computing?
• Providing Software as a Service (SaaS) delivering applications over the Internet.
• More recently also Hardware infrastructure,
platform as a service.
• Based on Utility Computing - pay-as-you-go:
– The under lying idea of infinite resources,
– No up-front costs,
– Billing (e.g. hourly).
March 24, 09
mark.baker@computer.org
Different Cloud Computing Layers
Application Service
(SaaS)
MS Live/ExchangeLabs, IBM,
Google Apps; Salesforce.com
Quicken Online, Zoho, Cisco
Application Platform
Google App Engine, Mosso,
Force.com, Engine Yard,
Facebook, Heroku, AWS
Server Platform
3Tera, EC2, SliceHost,
GoGrid, RightScale, Linode
Storage Platform
Amazon S3, Dell, Apple, ...
March 24, 09
mark.baker@computer.org
Virtualization
• Virtual workspaces:
– An abstraction of an execution environment that can be made
dynamically available to authorised clients by using welldefined protocols,
– Resource quota (e.g. CPU, memory share)
– Software configuration (e.g. O/S, provided services)
• Implement on Virtual Machines (VMs):
– Abstraction of a physical host machine
– Hypervisor intercepts and emulates instructions from VMs
and allows management of VMs
App
App
App
– VMWare, Xen, etc.
• Provide infrastructure API:
– Plug-ins to hardware/support structures
OS
OS
OS
Hypervisor
Hardware
Virtualized Stack
March 24, 09
mark.baker@computer.org
Cloud-Sourcing
• Why is it becoming a Big Deal:
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–
–
–
Using high-scale/low-cost providers,
Any time/place access via web browser,
Rapid scalability; incremental cost and load sharing,
Can forget need to focus on local IT.
• Concerns:
–
–
–
–
–
–
Performance, reliability, and SLAs,
Control of data, and service parameters,
Application features and choices,
Interaction between Cloud providers,
No standard API – mix of SOAP and REST!
Privacy, security, compliance, trust…
March 24, 09
mark.baker@computer.org
Different types of Cloud
• Amazon:
–
–
–
–
Computing in the cloud!
EC2 (with S3, SQS and SimpleDB),
Use Xen VMs,
Workflow and Security.
• Google:
– Apps: Python module/API,
– Working also with IBM.
• Microsoft:
– Azure!
• Yahoo:
– Pipes, Working with Computational Research Laboratories
• Sun/IBM/HP and others…
March 24, 09
mark.baker@computer.org
Cloud Schedule
Day 2: Cloud-based Services
0930 -Welcome and Introduction to Day 2 of the Workshop, Mark Baker
0945 - An Introduction to Cloud-based Services, Paul Watson, Newcastle
1035 -Tea/Coffee (15 minutes)
1050 -The Open Cirrus Cloud Computing Testbed, Marcel Kunze - opencirrus
1140 - Clouds and Services for Data Intensive Research, Roger Barga, MS
1230 - Lunch (60 minutes)
1330 - Developing Applications for Cloud Computing Platforms, Jeremy Cohen, IC
1415 -The Attraction of Cloud to Enterprise, vision and reality, Ian Osborne
1500 - Coffee
1515 - Cloud-based Security Services, Richard Sinnott, Glasgow
1600 - IBM and Dynamic Infrastructure, Doug Neilson, IBM
1645 - Panel and General Discussion about the days activities (45 minutes)
March 24, 09
mark.baker@computer.org