Virtual machine - made cloud computing possible

VM types:

• Xen -free
• VMware - commercial, used by industry, full virtualization
• Parallels - tailored for Mac users

Amazon uses Xen, will be used by this class

Hyperviser - VM 0-layer

'Amazon web services'
single Front: multiple back ends machines doing the work

Jargon:

• AMI - Amazon Machine Image , it is a file on a disk
• Instance - IMA executed to become a machine
• EBS Volume- elastic block store volume, secondary storage allocated elsewhere

Various types of AMI, we will use Fedora - a version of Red Hat Linux

On-Demand Instances:

• c1. small, $0.10 per hour
• c1.medium , 2 virtual cores
• c1.xLarge, 8 virtual cores, $0.80 per hours

All resources are described at http://cs50.net/wiki/CS_264

Private cloud computing: http://aws.amazon.com/