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Cloud Computing
The delivery of services such as storage, servers, databases, networking, and software over the Internet.
Cloud Computing Components
Hardware and Software.
Cloud Hardware Components
Servers, Storage, Networking Equipment, Data Centers.
Cloud Software Components
Virtualization Software, Cloud Management Tools, Operating Systems, Application Software.
Virtualization Software
Creates virtual versions of computers, operating systems, and storage devices.
Cloud Computing Characteristics
On-Demand Self-Service, Broad Network Access, Resource Pooling, Rapid Elasticity, Measured Service.
On-Demand Self-Service
Users can provision computing resources automatically without human interaction.
Broad Network Access
Cloud services are accessible via various devices like mobile phones, laptops, and PDAs.
Resource Pooling
Cloud providers dynamically assign resources to multiple users.
Rapid Elasticity
Cloud resources can be scaled up or down quickly based on demand.
Measured Service
Cloud providers monitor and optimize resource usage for transparency.
Three Main Cloud Service Models
Infrastructure as a Service (IaaS), Platform as a Service (PaaS), Software as a Service (SaaS).
IaaS Definition
Provides virtualized computing resources such as VMs, storage, and networking.
IaaS Providers
Microsoft Azure Virtual Machines, Amazon EC2, Google Compute Engine.
IaaS Key Features
Resource Scalability, Self-Service, Pay-as-you-go Pricing, Network Access, Storage and Backup.
SaaS Definition
Cloud-based applications delivered over the Internet on a subscription basis.
SaaS Examples
Google Docs, Microsoft Office 365, Dropbox.
SaaS Key Features
No Maintenance, Multi-Tenancy, Accessibility from any device, Subscription-Based.
PaaS Definition
Provides a development platform with built-in tools for coding, testing, and deploying applications.
PaaS Providers
Microsoft Azure App Services, Google App Engine, Heroku.
PaaS Key Features
Development Framework, Built-in Services, Multi-Language Support, Automated Scaling.
Four Cloud Deployment Models
Public Cloud, Private Cloud, Hybrid Cloud, Community Cloud.
Public Cloud
Services offered over the Internet to multiple users by third-party providers.
Public Cloud Providers
AWS, Microsoft Azure, Google Cloud Platform (GCP).
Private Cloud
A cloud environment dedicated to a single organization.
Hybrid Cloud
A combination of private and public cloud infrastructures.
Community Cloud
A cloud infrastructure shared among multiple organizations with common needs.
Hybrid Cloud Advantage
Combines security of private cloud with scalability of public cloud.
Community Cloud Use Cases
Government agencies, universities, research institutions.
Cloud Computing Benefits
Cost Efficiency, Business Continuity, Accessibility, Flexibility.
Disaster Recovery
Cloud-based backup and failover options improve resilience.
Environmentally Friendly
Cloud data centers are more energy-efficient than on-premises servers.
Pay-Per-Use Model
Users pay only for the resources they consume.
Cloud Security
Cloud providers offer advanced security features for data protection.
Cloud Computing Challenges
Security and Privacy, Vendor Lock-in, Performance and Latency.
Vendor Lock-in
Difficulty in switching cloud providers due to dependencies.
Data Mobility
Challenges in transferring data between providers due to costs and compatibility.
Performance and Latency
Potential delays in data transmission based on location.
Management Complexity
Hybrid and multi-cloud setups require careful resource management.
Long-Term Costs
Although cost-effective initially, long-term expenses may rise with higher service usage.
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