Cloud Fundamentals
From on-premise to cloud — core concepts and models
Category: Cloud
Learning Path: What → Why → Architecture → Setup → Real Examples → Production → Interview Prep
What is Cloud Fundamentals?
Public cloud: someone else's data center (AWS, Azure, GCP). Private cloud: your own data center with cloud-like operations. Hybrid: both connected. Multi-cloud: intentional use of multiple public clouds. Multi-cloud adds complexity — only adopt for specific strategic reasons.
Why Cloud Fundamentals?
IaaS: you manage OS upward (EC2, Azure VM). PaaS: you manage only your code (App Service, Cloud Run). SaaS: you use the software (Gmail, Salesforce). Serverless: you manage only functions, no servers. Higher abstraction = less control but less operational burden.
Learning Modules
Module 01 — Cloud Models
Public, Private, Hybrid, Multi-Cloud
Public cloud: someone else's data center (AWS, Azure, GCP). Private cloud: your own data center with cloud-like operations. Hybrid: both connected. Multi-cloud: intentional use of multiple public clouds. Multi-cloud adds complexity — only adopt for specific strategic reasons.
Topics covered:
Module 02 — Service Models
IaaS, PaaS, SaaS, Serverless
IaaS: you manage OS upward (EC2, Azure VM). PaaS: you manage only your code (App Service, Cloud Run). SaaS: you use the software (Gmail, Salesforce). Serverless: you manage only functions, no servers. Higher abstraction = less control but less operational burden.
Topics covered:
Module 03 — Core Concepts
Elasticity, HA, DR, Cost
Elasticity: scale up/down automatically based on demand. HA: design for component failure (multi-AZ minimum). DR: business continuity when a region fails. RTO (Recovery Time Objective) = how fast you recover. RPO (Recovery Point Objective) = how much data loss is acceptable.
Topics covered:
Production Example
Interview Prep
!!! tip "PSR Formula"
Answer every question: Problem → Solution → Result. 45-90 seconds max.
Common Interview Questions
??? question "What is Cloud Fundamentals and why would you use it in production?"
Add your answer here based on your real experience.
Framework: State the problem it solves → explain your solution → describe the result.
??? question "How does Cloud Fundamentals work internally? Explain the architecture."
Add your answer here based on your real experience.
Framework: State the problem it solves → explain your solution → describe the result.
??? question "What are the main components of Cloud Fundamentals?"
Add your answer here based on your real experience.
Framework: State the problem it solves → explain your solution → describe the result.
??? question "How do you handle failures in Cloud Fundamentals?"
Add your answer here based on your real experience.
Framework: State the problem it solves → explain your solution → describe the result.
??? question "What is your production experience with Cloud Fundamentals?"
Add your answer here based on your real experience.
Framework: State the problem it solves → explain your solution → describe the result.
??? question "How do you monitor and observe Cloud Fundamentals in production?"
Add your answer here based on your real experience.
Framework: State the problem it solves → explain your solution → describe the result.
??? question "What are the security considerations for Cloud Fundamentals?"
Add your answer here based on your real experience.
Framework: State the problem it solves → explain your solution → describe the result.
??? question "How does Cloud Fundamentals compare to alternatives?"
Add your answer here based on your real experience.
Framework: State the problem it solves → explain your solution → describe the result.
??? question "Explain Cloud Models in Cloud Fundamentals."
Add your answer here based on your real experience.
Framework: State the problem it solves → explain your solution → describe the result.
??? question "Explain Service Models in Cloud Fundamentals."
Add your answer here based on your real experience.
Framework: State the problem it solves → explain your solution → describe the result.
Official Resources
Part of [LearnwithVishnu](https://learnwithvishnu.pages.dev) — Basics → Production → Architect