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Docker & Containers Roadmap
Complete Docker learning path — from running your first container to building production-grade multi-stage images, Docker Compose, security hardening, and container orchestration.
2–3 months
7 phases
FoundationIntermediateAdvancedExpert
Phase 1
Container Basics
What containers are and how they work
Foundation1–2 weeks
What to learn
- Containers vs VMs — Linux namespaces and cgroups
- Docker architecture — daemon, client, registry
- Running containers — docker run, exec, logs, stop
- Port mapping and environment variables
- Understanding container layers and images
Key tools
dockerDocker Desktop
Phase 2
Dockerfile Mastery
Build efficient, secure images
Foundation2–3 weeks
What to learn
- Dockerfile instructions — FROM, RUN, COPY, CMD, ENTRYPOINT
- Multi-stage builds for smaller images
- Layer caching and build optimization
- ARG vs ENV — build-time vs runtime
- .dockerignore for faster builds
- Choosing base images — Alpine, Distroless, Slim
Key tools
docker buildBuildKithadolint
Phase 3
Docker Compose
Multi-container applications made easy
Intermediate2 weeks
What to learn
- docker-compose.yml — services, networks, volumes
- Multi-service apps (app + db + cache + reverse proxy)
- Health checks and depends_on
- Environment files and variable substitution
- Override files for dev/staging/prod
- Docker Compose profiles
Key tools
docker composelazydocker
Phase 4
Networking & Volumes
Connect containers and persist data
Intermediate1–2 weeks
What to learn
- Bridge, host, and overlay networks
- Container DNS and service discovery
- Named volumes vs bind mounts
- Volume drivers for cloud storage
- Container-to-container communication
- Publishing ports and reverse proxies
Key tools
docker networkTraefikNginx
Phase 5
Security Hardening
Secure your containers for production
Advanced2–3 weeks
What to learn
- Run as non-root user
- Read-only file systems
- Drop Linux capabilities
- Image scanning with Trivy and Snyk
- Secrets management — never bake secrets in images
- Distroless and scratch base images
- Docker Content Trust and image signing
Key tools
TrivySnykDocker ScoutCosign
Phase 6
CI/CD with Docker
Automate builds, tests, and deployments
Advanced2–3 weeks
What to learn
- Docker in GitHub Actions / GitLab CI
- Multi-platform builds (amd64, arm64)
- Registry management — Docker Hub, GHCR, ECR
- Automated image tagging strategies
- Docker layer caching in CI
- Integration testing with Docker Compose in CI
Key tools
GitHub ActionsGitLab CIGHCRDocker Hub
Phase 7
Container Orchestration
Move beyond single-host Docker
Advanced2–3 weeks
What to learn
- When to move from Docker Compose to Kubernetes
- Docker Swarm basics (if relevant)
- Container runtime options — containerd, CRI-O
- Podman as a Docker alternative
- OCI standards — images and runtimes
- Kubernetes fundamentals for Docker users
Key tools
KubernetescontainerdPodmankind
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Frequently Asked Questions
Common questions about the Docker & Containers roadmap
1How long does it take to learn Docker?
Docker basics (images, containers, volumes, networking) can be learned in 2–3 weeks. Advanced topics like multi-stage builds, Docker Compose, security hardening, and production patterns take 4–6 weeks.
2Is Docker still relevant in 2026?
Absolutely. Docker is the foundation of containerized development. Even with Kubernetes, Podman, and serverless, Docker images are the universal packaging format. Every DevOps engineer needs Docker skills.
3What is the difference between Docker and Kubernetes?
Docker packages and runs individual containers. Kubernetes orchestrates many containers across a cluster — handling scaling, load balancing, rolling updates, and self-healing. They work together, not as alternatives.
4Should I learn Docker Compose or Kubernetes?
Learn Docker Compose first for local development and small deployments. Then learn Kubernetes when you need production-grade orchestration with auto-scaling, service discovery, and multi-node clusters.
5What are Docker best practices for production?
Use multi-stage builds, run as non-root user, pin base image versions, minimize layers, scan for vulnerabilities, use .dockerignore, never store secrets in images, and keep images under 200MB.