Cloud Service Models (IaaS, PaaS, SaaS)

The Shared Responsibility Model

Cloud is NOT "set it and forget it." Both you and the cloud provider share security and operational responsibilities.

IaaS Examples

AWS EC2 - Virtual machines

aws ec2 run-instances --image-id ami-0c55b159cbfafe1f0 --instance-type t2.micro

Azure VMs - Virtual machines on Azure

az vm create --resource-group myGroup --name myVM --image UbuntuLTS

Google Compute Engine - GCP VMs

gcloud compute instances create my-instance --zone=us-central1-a

IaaS Use Cases

✅ Testing and development ✅ Website and web app hosting ✅ Storage, backup, and recovery ✅ High-performance computing ✅ Big data analysis

PaaS (Platform as a Service)

Provider manages: Everything except Application and Data You manage: Application, Data

PaaS Examples

Heroku - App platform

heroku create my-app
git push heroku main

AWS Elastic Beanstalk - Managed platform

eb create production-env
eb deploy

Google App Engine - Serverless PaaS

gcloud app deploy app.yaml

PaaS Use Cases

✅ API development and management ✅ Business analytics/intelligence ✅ Database management ✅ Rapid application development ✅ IoT applications

SaaS (Software as a Service)

Provider manages: Everything You manage: Nothing (just use it)

SaaS Examples

Salesforce - CRM Microsoft 365 - Office suite Slack - Team communication GitHub - Version control

SaaS Use Cases

✅ Email and collaboration ✅ CRM and enterprise applications ✅ HR and finance systems ✅ Productivity tools ✅ Social media

Comparison Matrix