Page 257 - How Cloud Computing Is Transforming Business and Why You Cant Afford to Be Left Behind

GL OS SARY

Complex event processing: The ability to define specific events
taking place in the software infrastructure, such as a transac-
tion, with the intent of establishing norms, detecting deviations,
and setting parameters around acceptable event sequences.
Events may be queried for frequency of occurrence in specific
time frames.

Elastic Block Store: An Amazon Web Services service on the
Elastic Compute Cloud (EC2). It provides temporary storage
for an application and its data as the application is running.

Elasticity: The ability of a computing resource to expand and
contract as needed; a function of workload balancing and ap-
plication performance management in the multitenant cloud.

When needed, additional virtual machines are brought online.

Eucalyptus: An open source project that duplicated the basic
Web service application programming interfaces (APIs) of the
Amazon Elastic Compute Cloud (EC2). It supplies an inter-
face equivalent to the ones that load a virtual machine into the
EC2 engine or invoke Amazon Simple Storage Service (S3).

Eucalyptus Systems: The company formed by Rich Wolski,
Woody Rollins, and others to build commercial products out

of Eucalyptus open source code.

External cloud: Usually a cloud service that is available to the
public over the Internet, such as Rackspace Cloud, GoGrid,
or Amazon Elastic Compute Cloud (EC2).

Firewall: An appliance sitting at the perimeter of the corpora-
tion inspecting network traffic for malware, such as Trojans,

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