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Cloud Computing
A comprehensive guide to cloud computing, its types, and service models
Overview
Cloud computing enables users to access computing resources over the internet, eliminating the need for physical infrastructure ownership.
💡 Key Benefits
- Scalability: Easily scale up or down based on demand
- Cost-Efficiency: Pay only for resources used
- Accessibility: Access from anywhere with internet
- Flexibility: Choose from various service options
- Maintenance: Provider handles updates and maintenance
☁️ Cloud Deployment Models
Public Cloud vs Private Cloud
-
Public Cloud
- Shared infrastructure
- Multiple tenants
- Internet accessible
- Examples: AWS, Azure, GCP -
Private Cloud
- Dedicated infrastructure
- Single organization
- Private network
- Examples: VMware vSphere, OpenStack
Multitenancy
- Shared infrastructure with isolated environments
- Cost-effective resource utilization
- Secure data separation between clients
Cloud Service Models
IaaS (Infrastructure as a Service)
- Provides virtualized computing resources
- User manages OS and applications
- Examples:
AWS EC2, Azure Virtual Machines, Google Compute Engine
PaaS (Platform as a Service)
- Development and deployment platform
- Managed infrastructure
- Examples:
Google App Engine, Azure App Services, Heroku
SaaS (Software as a Service)
- Ready-to-use applications
- Subscription-based model
- Examples:
Google Workspace, Microsoft 365, Salesforce
Service Model Comparison
| Feature | IaaS (Infrastructure as a Service) | PaaS (Platform as a Service) | SaaS (Software as a Service) |
|---|---|---|---|
| Control | High | Medium | Low |
| Management | User | Partial | Provider |
| Flexibility | High | Medium | Low |
| Scalability | Manual | Automatic | Automatic |
| Use Case | Infrastructure management | Application development | End-user applications |
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