Module 1: Introduction to Docker

What is Docker?

Benefits of containerization

Docker vs Virtual Machines

Docker architecture (Engine, CLI, Daemon, Registry)

Module 2: Getting Started

Installing Docker on Linux/Windows/Mac

Docker CLI basics (run, ps, stop, rm, images, etc.)

Docker Hub and pulling images

Running your first container (hello-world, nginx, ubuntu)

Module 3: Docker Images

Understanding Docker Images and Layers

Creating custom images with Dockerfile

Dockerfile instructions: FROM, RUN, COPY, ADD, CMD, ENTRYPOINT, etc.

Image tagging and pushing to Docker Hub

Module 4: Docker Volumes

Introduction to Volumes

Volume vs Bind Mounts

Managing data with Docker Volumes

Backup and restore volumes

Module 5: Docker Networking

Bridge, Host, None, and Overlay networks

Creating custom networks

Connecting multiple containers via network

Port mapping and exposing services

Module 6: Docker Compose

Introduction to Docker Compose

Writing docker-compose.yml

Multi-container applications (e.g., Node.js + MongoDB)

Compose commands and scaling services

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Advanced Docker Topics

Module 7: Dockerfile Best Practices

Multi-stage builds

Caching strategies

Image size optimization

Security best practices

Module 8: Docker Registry & Image Management

Self-hosted Docker Registry

Working with AWS ECR / GitHub Container Registry

Cleaning up unused images and containers

Image vulnerability scanning tools (e.g., Trivy, Clair)

Module 9: Docker Security

Least privilege principle

Docker Content Trust

Seccomp, AppArmor, and SELinux

Running containers as non-root user

Module 10: Docker in CI/CD

Integrating Docker in GitHub Actio

ns, GitLab CI/CD, Jenkins

Building & pushing Docker images in pipelines

Using Docker for test automation