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Docker Complete Guide 2026

Start with Docker basics — images, containers, Dockerfiles — then master networking, volumes, Docker Compose, Swarm, security, and Kubernetes integration.

Docker Fundamentals

start here: no prior container knowledge needed

  • What is Docker? · Containers vs VMs

    containerization concepts, Docker architecture, installation

    →
  • Essential Docker Commands

    docker run, ps, stop, rm, images, pull, push

    →
  • Understanding Docker Images

    layers, registries, tagging, image management

    →
  • Docker Container Lifecycle

    created, running, paused, stopped, deleted states

    →

Dockerfile & Building Images

create custom images like a pro

  • Dockerfile Basics

    FROM, RUN, COPY, ADD, CMD, ENTRYPOINT

    →
  • Dockerfile Best Practices

    multi-stage builds, layer caching, image size optimization

    →
  • Multi-Stage Builds

    minimize final image size, build and runtime separation

    →
  • Image Tagging & Registries

    Docker Hub, private registries, versioning strategies

    →

Docker Networking

connect containers securely

  • Docker Network Drivers

    bridge, host, none, overlay, macvlan

    →
  • Container Communication

    container linking, user-defined networks, DNS resolution

    →
  • Port Mapping & Expose

    publish ports, EXPOSE instruction, host networking

    →

Docker Storage & Volumes

persistent data management

  • Docker Volumes Guide

    named volumes, bind mounts, tmpfs

    →
  • Bind Mounts vs Volumes

    when to use each, performance considerations

    →
  • Storage Drivers

    overlay2, aufs, devicemapper, btrfs

    →

Docker Compose

multi-container applications

  • Docker Compose Basics

    docker-compose.yml, services, networks, volumes

    →
  • Docker Compose Commands

    up, down, logs, exec, build, pull, restart

    →
  • Environment Variables in Compose

    env_file, environment, .env file

    →
  • Compose for Production

    limitations, alternatives (Swarm, Kubernetes)

    →

Docker Swarm

native container orchestration

  • Docker Swarm Mode

    manager nodes, worker nodes, Raft consensus

    →
  • Swarm Services & Tasks

    replicas, global services, rolling updates

    →
  • Swarm Networking

    overlay networks, ingress routing mesh

    →
  • Swarm vs Kubernetes

    comparison, use cases, migration strategies

    →

Docker Security

secure your containers

  • Docker Security Best Practices

    image scanning, user namespaces, seccomp, AppArmor

    →
  • Container Image Scanning

    Trivy, Clair, Docker Scout, vulnerability detection

    →
  • Docker Secrets Management

    Swarm secrets, BuildKit secrets, environment variables

    →
  • Rootless Docker

    running Docker without root privileges

    →

Docker & Kubernetes

from containers to orchestration

  • Running Docker on Kubernetes

    minikube, kind, Docker Desktop Kubernetes

    →
  • Migrating from Swarm to Kubernetes

    compose to k8s translation, helm charts

    →
  • Container Runtimes in K8s

    containerd, CRI-O, Docker Engine

    →

Troubleshooting & Debugging

solve common Docker issues

  • Docker Logs & Debugging

    docker logs, docker events, docker inspect

    →
  • Container Performance Monitoring

    docker stats, cAdvisor, resource limits

    →
  • Docker Disk Space Cleanup

    docker system prune, removing unused images, volumes

    →
  • Common Docker Mistakes

    layers too large, dangling images, exposed ports

    →

Interview & Real-World Scenarios

ace your DevOps interview

  • Docker Interview Questions

    basic to advanced topics, scenario-based questions

    →
  • Real-World Docker Projects

    microservices, CI/CD integration, local development

    →
  • Docker in DevOps Pipelines

    Jenkins, GitHub Actions, GitLab CI integration

    →
  • Docker Cheatsheet

    quick reference for daily Docker commands

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