Introduction to Cloud Computing

Giovanni Toraldo System administrator

Before the cloud

A server for each service:Hardware requirements

Software requirements (OS)

Security requirements

Problems:Hardware maintenance

Electric bills

Provisioning delays

Cloud prerequisites

There are few underlying technologies developed in the last years:

Virtualization

Distributed Storage

Web

Virtualization

The creation of a virtual machine that acts like a real computer with an operating system. Software executed on these virtual machines is separated from the underlying hardware resources. - Wikipedia

Distributed storage

is any file system that allows access to files stored on multiple hosts and share them via a network. - Wikipedia

Web

communication between two parts over the Web (Internet), typically conveyed using HTTP, XML and other Web-related standards. - Wikipedia

The Cloud

Infrastructure as a service (IaaS)

Computational power

Storage space

Network connectivity

Platform as a Service (PaaS)

Computing platform for web applications

Software as a Service (SaaS)

Access to a web application, completely managed (backups, upgrades, etc)

Cloud advantages

Pay-per-use, minimum investment

Availability, no worries about hardware faults

Elasticity, scaling up and down in seconds

Everything is manageable from a web interface

How to create our own cloud

OpenNebula is the industry standard open-source product for data center virtualization - http://www.opennebula.org

OpenNebula Architecture

Credits

http://www.flickr.com/photos/richard_jones/3245444875/

http://www.flickr.com/photos/joncrel/3238202791/

http://en.wikipedia.org/wiki/File:Cloud_computing.svg

http://www.flickr.com/photos/chrisdag/6073931293

http://www.flickr.com/photos/35762175@N05/3310686922

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