Docker & Containers

Overview

A focused roadmap to master Docker containerization, from your first container to production-grade multi-service deployments. Docker revolutionized software delivery by solving the "works on my machine" problem — packaging applications with all dependencies into portable containers that run identically everywhere.

Containerization is now a fundamental skill for every software engineer. Frontend developers use Docker for consistent development environments, backend engineers containerize services for deployment, data engineers package pipelines for reproducibility. Docker is also the prerequisite for Kubernetes — you cannot orchestrate containers without understanding how they work.

This roadmap covers the full Docker journey: container fundamentals and the Linux features that make them possible (namespaces, cgroups), image building with optimized multi-stage Dockerfiles, Docker Compose for local multi-service development, networking (bridge, host, overlay), persistent storage (volumes, bind mounts), security best practices (rootless containers, image scanning), and CI/CD integration.

By completing this roadmap, you will be able to containerize any application, write production-optimized Dockerfiles that produce minimal images, orchestrate development environments with Compose, implement security best practices, and integrate Docker into CI/CD pipelines.

Interview questions

• How long to learn Docker?
• Docker Desktop or Docker Engine?
• How do I reduce Docker image size?
• What is the difference between COPY and ADD?
• When should I use Docker Compose vs Kubernetes?
• How do I handle secrets in Docker?

More Roadmaps topics

• Backend Development
• Data Engineering
• Data Structures & Algorithms
• DevOps Engineering
• Frontend Development
• Full-Stack Development
• Generative AI & LLMs
• Kubernetes
• Machine Learning
• React.js Mastery
• System Design