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Complete DevOps and SDLC Tutorial for Beginners | What is DEVOPS | What is SDLC

 

✅ Complete DevOps and SDLC Tutorial for Beginners

1. What is DevOps?

  • Definition:
    DevOps stands for Development and Operations.
    It is a culture and practice that combines software development (Dev) and IT operations (Ops) to shorten the development lifecycle and deliver high-quality software continuously.

  • Purpose:
    DevOps automates the software deployment process using CI/CD pipelines, eliminating manual deployment steps.

  • Key Benefits:

    • Faster software delivery.

    • Improved collaboration between teams.

    • Reduced risk of deployment failures.

    • Continuous improvement and feedback loop.

CI/CD in DevOps

  • CI (Continuous Integration):

    • Developers integrate code frequently into a shared repository (e.g., GitHub).

    • Automated build and test process after every integration.

  • CD (Continuous Deployment/Delivery):

    • Continuous Delivery: Automatically deploys code to a staging environment after passing tests.

    • Continuous Deployment: Deploys code directly to production without manual intervention.

Role of a DevOps Engineer

  • Acts as a bridge between:

    • Developers → who write the code.

    • QA → who test the code.

    • Networking & Server Admin → who manage infrastructure.

    • Support Team → who ensure system stability.

  • Main responsibility: Automate processes, create CI/CD pipelines, and manage cloud/infrastructure.


2 DevOps Lifecycle



The DevOps process includes:

  1. Plan: Requirement analysis & sprint planning.

  2. Code: Develop software using Git, IDEs.

  3. Build: Compile and package code (e.g., Maven, Gradle).

  4. Test: Automated testing using tools like Selenium.

  5. Release: Deploy to production environment.

  6. Deploy: Continuous Deployment with Jenkins, Docker.

  7. Operate: Application runs on servers/cloud.

  8. Monitor: Monitor performance using Prometheus, Grafana.

3. What is SDLC?

  • Definition:
    SDLC stands for Software Development Life Cycle.
    It is a step-by-step process to develop software in a structured way.

Phases of SDLC

  1. Requirement Gathering

  2. Design

  3. Development

  4. Testing

  5. Deployment

  6. Maintenance

Popular Models of SDLC

  • Waterfall Model

  • V-Model

  • Spiral Model

  • Agile Model (Most Preferred Today)

Agile Model

  • Works on small planning using Sprints (short development cycles).

  • Scrum Team:

    • Scrum Master → Facilitates the team.

    • Developers, QA, DevOps → Implement and test features.

    • End User/Product Owner → Provides feedback.

  • Stand-up Meetings: Daily 15-minute meetings to discuss progress, blockers, and plans.

4. Tools Used in DevOps

a) Code Management

  • Git: Distributed version control system.

  • GitHub: Remote repository for storing code and collaborating.

b) Build Automation

  • Maven, Gradle, or Ant.

c) CI/CD Tools

  • Jenkins, GitLab CI, Azure DevOps, CircleCI.

d) Configuration Management

  • Ansible, Chef, Puppet.

e) Containerization

  • Docker, Kubernetes.

f) Monitoring

  • Prometheus, Grafana, Nagios.

5. Simple DevOps Workflow

  1. Developer writes code → pushes to GitHub.

  2. CI Tool (Jenkins) detects changes → runs build → tests code.

  3. Code deployed automatically to Staging Server.

  4. After approval → deployed to Production Server.

6. Quick Hands-On (Beginner Exercise)

✅ Install Git
✅ Create GitHub Repository
✅ Push Code from Local to GitHub
✅ Install Jenkins (on local or cloud)
✅ Create a simple CI/CD pipeline using Jenkins

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