DevSecOps Fundamentals – A Beginner's Guide to Modern Software Development
Session 01: DevSecOps Fundamentals – A Beginner's Guide to Modern Software Development
Welcome to the foundation of your DevSecOps journey. In this session, we’ll break down the Software Development Life Cycle (SDLC), understand the shift from traditional methods like Waterfall to modern approaches like Agile, and explore how DevOps and DevSecOps streamline software delivery with security in mind.
🚀 What is SDLC?
Think of building an app like constructing a house—you can't just start laying bricks. You need a process. That’s where SDLC (Software Development Life Cycle) comes in.
🛠️ The 7 Stages of SDLC:
Requirement Analysis – What does the app need to do?
Planning – How will we build it?
Design – Convert ideas into blueprints.
Implementation – Code the application.
Testing – Validate if it works as expected.
Deployment – Launch it to users.
Maintenance – Fix bugs, roll out updates, improve performance.
💣 Waterfall Model – The Risky Old-School Way
Picture a school with only one final exam.
Teachers (IT Management) ignore progress until the end.
Students (Developers) cram at the last minute.
Parents (Clients) panic when things go wrong.
❌ Problems with Waterfall:
One-way process: Can’t go back to fix earlier phases.
Long development cycles (6+ months), then testing.
High defect count (e.g., 100 bugs after release).
Costly rework and delays.
⚡ Agile – The Smarter, Iterative Method
Now imagine schools having regular unit tests:
Teachers plan from Day 1.
Students prepare continuously.
Parents get regular feedback.
✅ Benefits of Agile:
Work in small parts (Signup, Login, Order modules).
Deploy every 2–4 weeks.
Fewer bugs (e.g., 20 instead of 100).
Fast fixes, continuous testing.
Agile brings flexibility, speed, and early feedback into software development.
🔄 DevOps & DevSecOps – Speed + Quality + Security
Agile is the mindset; DevOps is the implementation.
🚧 What is DevOps?
Automate build, test, and release cycles.
Developers, Testers, and Operations collaborate.
Deploy features the same day you write code.
🛡️ What is DevSecOps?
DevSecOps = DevOps + Security.
Security tools are integrated into every step.
Code is scanned, tested, and verified instantly.
Real-World Example:
Day 1: You write 100 lines of code
Day 1: You test and deploy that code
Day 1: You fix bugs immediately
Result: Speed + Accuracy + Security 🔥
🐧 Why Linux is a DevOps Engineer’s Best Friend
Most cloud servers run Linux. It’s lightweight, secure, and built for automation.
| Feature | Windows | Linux |
|---|---|---|
| Reboot Needed | Often | Rarely |
| Graphics | Heavy GUI | Lightweight, No GUI |
| RAM Usage | High | Low |
| Security | Moderate | Strong (Firewall, ACL) |
| License | Paid | Free, Open Source |
With Linux, you’ll learn to:
Launch virtual servers (using AWS)
Run basic and advanced commands
Create and manage user accounts
Install & configure software
Manage and monitor services
This is your first step into a powerful new world.
DevSecOps is more than coding—it's about building safe, scalable systems fast.
Stay consistent, stay curious.
**- Kalyan **
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