Docker

Comprehensive collection of learning resources for Docker — the industry-standard container platform for building, shipping, and running applications.

Documentation

Guide	Description
Docker Fundamentals	Architecture, images, containers, and the problem Docker solves
Dockerfile Deep Dive	Instructions, multi-stage builds, best practices, and optimization
Networking & Storage	Network drivers, volumes, bind mounts, and container communication
Compose & Swarm	Multi-container apps with Compose and orchestration with Swarm
Security & Production	Security hardening, monitoring, CI/CD, and production best practices
Docker & Kubernetes	Container orchestration, deployments, and cloud-native workflows
Command Cheat Sheet	Complete Docker CLI reference — containers, images, volumes, networks
Interview Questions	50+ questions from beginner to advanced with detailed answers

What is Docker?

Docker is an open platform for developing, shipping, and running applications inside containers. Containers package code and all its dependencies so applications run quickly and reliably across environments. Unlike virtual machines, containers share the host OS kernel, making them lightweight and fast.

Key Concepts

• Images — Read-only templates for creating containers
• Containers — Runnable instances of images
• Dockerfile — Instructions to build an image
• Docker Compose — Define multi-container applications
• Volumes — Persist data beyond container lifecycle
• Networks — Connect containers together

Docker Architecture

┌─────────────┐     ┌──────────────────────────────────────┐
│ Docker CLI   │────▶│           Docker Daemon               │
│ docker build │     │  ┌──────────┐  ┌──────────┐          │
│ docker run   │     │  │ Images   │  │Containers│          │
│ docker pull  │     │  └──────────┘  └──────────┘          │
└─────────────┘     │  ┌──────────┐  ┌──────────┐          │
                    │  │ Volumes  │  │ Networks │          │
┌─────────────┐     └──────────────────────────────────────┘
│ Docker Hub   │                    │
│ (Registry)   │◀───────────────────┘
└─────────────┘

Learning Path

1. Start with fundamentals — understand containers, images, and architecture
2. Master Dockerfiles — build optimized images with multi-stage builds
3. Learn networking and storage — connect containers and persist data
4. Use Docker Compose — define multi-container applications
5. Secure your containers — harden for production environments
6. Scale with Kubernetes — orchestrate containers at scale

Quick Start

# Pull and run your first container
docker run hello-world

# Run an interactive Ubuntu container
docker run -it ubuntu bash

# Run a web server (accessible at http://localhost:8080)
docker run -d -p 8080:80 --name webserver nginx

# View running containers
docker ps

# Clean up
docker stop webserver && docker rm webserver

External Resources

Resource	Description
Docker Official Docs	Official documentation
Play with Docker	Free interactive Docker playground
Docker Hub	Container image registry
Dockerfile Best Practices	Official best practices guide
Awesome Docker	Curated list of Docker resources
Docker Curriculum	Comprehensive tutorial from basics to AWS deployment
The Docker Handbook	Free open-source book on fundamentals

Community Resources

Resource	Description
Docker for Beginners	Tutorial from "Hello world!" to basic interactions
Docker Simplified in 55 Seconds	Quick visual introduction
Play With Docker Training	PWD beginner to advanced labs
Benefits of Using Docker	Development and delivery benefits
Bootstrapping Microservices	Practical guide by Ashley Davis
Container Terminology	Understanding the container ecosystem