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Cloud Computing Origin
“Comes from the early days of the Internet where we drew the network as a cloud… we didn’t care where the messages went… the cloud hid it from us”
– Kevin Marks, Google
“The emerging cloud abstracts infrastructure complexities of servers, applications, data, and heterogeneous platforms”
- Jeff Bezos, CEO, Amazon.
What is Cloud Computing?
Cloud computing is a model for enabling convenient, on-demand network access to a shared pool of configurable computing resources (e.g., networks, servers, storage, applications, and services) that can be rapidly provisioned and released with minimal management effort or service provider interaction. This cloud model promotes availability and is composed of five essential characteristics, three service models, and four deployment models.
– National Institute of Standards and Technology (NIST) def–v15.
Cloud Computing – Essential Characteristics
• Location Independent Resource Pooling
• Measured Service
• Rapid Elasticity
• On Demand Self Service
• Broad Network Access
Cloud Computing – Service Models
• Software as a Service (SaaS): Use provider’s applications over a network
• Platform as a Service (PaaS): Enables developers to build applications on scalable systems and deploy as a service to customers. (Example: Google App Engine)
• Infrastructure as a Service (IaaS): Provide processing, storage, network capacity, and other fundamental computing resources where the consumer is able to deploy and run arbitrary software
Cloud Computing – Deployment Models
• Private cloud: Enterprise owned and operated for an organization only.
• Community cloud: Shared infrastructure for specific community.
• Public cloud: Provided to the public, generally large-scale.
• Hybrid cloud: Composition of two or more clouds.
Cloud Computing Properties
Cloud computing consists some or all of the following properties:
• Massive scale
• Homogeneity
• Virtualization
• Resilient computing
• Low cost software
• Geographic distribution
• Service orientation
Cloud Computing Architecture
Cloud Computing – Applications
SaaS
• Applications for Collaboration: email, IM
• Online storage: Files, photos, music, movies…
• Management: Calendar, project management
• Office productivity: Word processor, presentations, spread sheet
• Tools: Media player, compression utility, cloud desktop, antivirus
PaaS
• Applications are unlimited. Type of application is limited by the developer’s knowledge only.
Cloud Computing – Advantages
• Simplicity – easy to deploy and use
• Pay as you use – pay only for the services you consume
• Cost saving – Lesser in-house IT costs
• Scalability
• Backup and Recovery
• Easy to upgrade