Beginner LevelCloud Computing (AWS/GCP/Azure)
What is the difference between IaaS, PaaS, and SaaS cloud service models?
❓ Interview Prompt: Compare Infrastructure as a Service (IaaS), Platform as a Service (PaaS), and Software as a Service (SaaS) management responsibilities.
Cloud computing service models determine the boundary of control between the customer and the cloud provider:
1. IaaS (Infrastructure as a Service):
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Examples: AWS EC2, GCP Compute Engine, Azure VMs.
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Provider Manages: Physical hardware, networking, virtualization hypervisor.
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Customer Manages: Operating system, patches, runtime, application code, data, and security firewalls.
2. PaaS (Platform as a Service):
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Examples: AWS Elastic Beanstalk, Heroku, Azure App Service, GCP Cloud Run.
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Provider Manages: OS updates, runtime environment, middleware, server scaling, hardware.
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Customer Manages: Application code and database configuration.
3. SaaS (Software as a Service):
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Examples: Gmail, Salesforce, Office 365, Slack.
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Provider Manages: Entire software stack from infrastructure up to application interface.
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Customer Manages: User accounts and data.
Code Implementation Example
typescript
// Decision Matrix for Cloud Service Models
function selectCloudModel(needsCustomOsKernel: boolean, needsZeroServerMgmt: boolean): string {
if (needsCustomOsKernel) return 'IaaS (AWS EC2 / Azure VMs)';
if (needsZeroServerMgmt) return 'PaaS (AWS Elastic Beanstalk / GCP Cloud Run)';
return 'SaaS (Managed Software APIs)';
}💡Decision matrix helper selecting IaaS, PaaS, or SaaS.
🎯 Interview Key Takeaway
IaaS provides raw virtual servers; PaaS manages runtimes and OS for application deployment; SaaS delivers complete web software.
#Cloud Models#IaaS#PaaS#SaaS#Beginner
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