Cloud Computing or On demand
computing (US NIST Definition):
A model for enabling ubiquitous, convenient, on demand network access to a shared
pool of configurable computing resources.
A model for enabling ubiquitous, convenient, on demand network access to a shared
pool of configurable computing resources.
Computing resources
example:-Networks, Servers, storage, applications and services.
Characteristics of Cloud
computing:
Self-service: Allow
consumers to provision computing resources.
Global Network
access: Access from internet.
Multitenancy: Allow
share the underlying hardware.
Elasticity: Scales
in or scale out to satisfy consumer demand.
Telemetry: Resources
can be monitored and metered by the service provide as well
as the cloud consumer.
as the cloud consumer.
Service models:
IaaS - Infrastructure as a
service: - Allow to provision computing resources and software.
Eg. - Openstack
PaaS - Platform as a
Service: - Provides the Operating system to consumer.
Eg. - Google engine
for android applications
SaaS - Software as a
service: - Provides OS as well as software
Eg. Office 365
Some more example
Other models :
Community Cloud :
shares infrastructure between several organizations from a specific
community with common concerns (security, compliance, jurisdiction, etc.), whether
managed internally or by a third-party, and either hosted internally or externally.
community with common concerns (security, compliance, jurisdiction, etc.), whether
managed internally or by a third-party, and either hosted internally or externally.
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