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'''Cloud computing explained''' — from the basic concepts to advanced architectures. This comprehensive guide covers service models, deployment types, and practical considerations for adopting cloud technology.

== What is Cloud Computing? ==

Cloud computing delivers computing resources — servers, storage, databases, networking, and software — over the internet on a pay-as-you-go basis. Instead of buying and maintaining physical hardware, you rent resources from a cloud provider.

For a simpler introduction, see [[What is Cloud Computing and How Can It Benefit You?]].

== Service Models ==

Cloud services are categorized into three primary models:

=== IaaS (Infrastructure as a Service) ===

You rent raw infrastructure: virtual machines, storage, and networks.

* '''You manage:''' OS, middleware, applications, data
* '''Provider manages:''' physical hardware, virtualization, networking
* '''Examples:''' [[Understanding VPS Hosting: A Comprehensive Guide|VPS hosting]], [[Choosing the Right Dedicated Server|dedicated servers]], cloud instances
* '''Best for:''' full control, custom environments, legacy applications

=== PaaS (Platform as a Service) ===

You get a platform for deploying applications without managing infrastructure.

* '''You manage:''' application code and data
* '''Provider manages:''' OS, runtime, middleware, infrastructure
* '''Examples:''' Heroku, Google App Engine, AWS Elastic Beanstalk
* '''Best for:''' rapid development, small teams, standardized stacks

=== SaaS (Software as a Service) ===

Complete applications delivered through a web browser.

* '''You manage:''' user settings and data
* '''Provider manages:''' everything else
* '''Examples:''' Gmail, Salesforce, Slack, Microsoft 365
* '''Best for:''' end users, businesses needing ready-made solutions

=== Comparison ===

{| class="wikitable"
|-
! Aspect !! IaaS !! PaaS !! SaaS
|-
| Control level || High || Medium || Low
|-
| Technical skill needed || High || Medium || Low
|-
| Customization || Full || Limited || Minimal
|-
| Management effort || High || Low || None
|-
| Cost predictability || Variable || Moderate || Predictable
|}

== Deployment Models ==

=== Public Cloud ===

Resources shared across multiple tenants on provider infrastructure.

* Lower cost, high scalability
* Less control over physical location
* Suitable for most workloads

=== Private Cloud ===

Dedicated infrastructure for a single organization.

* Complete control and customization
* Higher cost and management overhead
* Required for strict compliance (healthcare, finance, government)

=== Hybrid Cloud ===

Combines public and private clouds:

* Keep sensitive data on private infrastructure
* Burst to public cloud during demand spikes
* Gradually migrate workloads at your own pace
* Most enterprises adopt this model

=== Multi-Cloud ===

Using services from multiple cloud providers:

* Avoid vendor lock-in
* Choose best-of-breed services from each provider
* Geographic distribution
* More complex to manage

== Advanced Cloud Patterns ==

=== Serverless Computing ===

Run code without managing servers:

* Functions execute on demand
* Pay only for execution time (per millisecond)
* Automatic scaling from zero to millions of requests
* Examples: AWS Lambda, Google Cloud Functions, Cloudflare Workers

=== Infrastructure as Code (IaC) ===

Define infrastructure in configuration files:

* '''Terraform''' — multi-provider infrastructure provisioning
* '''Ansible''' — server configuration management
* '''CloudFormation''' — AWS-specific infrastructure templates

Benefits:
* Reproducible environments
* Version-controlled infrastructure
* Automated deployments

=== Microservices Architecture ===

Break monolithic applications into small, independent services:

* Each service handles one business function
* Services communicate via APIs
* Independent deployment and scaling
* Managed with [[Docker and Kubernetes: Getting Started|Kubernetes]]

== Cost Management ==

Cloud costs can spiral without oversight:

* '''Right-size resources''' — do not over-provision
* '''Use reserved instances''' — commit to 1–3 years for 30–60% savings
* '''Monitor spending''' — set up budget alerts
* '''Clean up unused resources''' — orphaned volumes, idle instances
* '''Consider [[VPS vs Dedicated Server: Complete Comparison|dedicated servers]]''' for predictable, steady-state workloads — often cheaper than cloud for consistent usage

== See Also ==

* [[What is Cloud Computing and How Can It Benefit You?]]
* [[Building a Scalable Cloud Infrastructure]]
* [[Docker and Kubernetes: Getting Started]]

[[Category:Cloud Computing]]

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