Docker
Learn Docker from first container to production. Images, networking, volumes, Compose, multi-stage builds, and secure registries.
13 lessons, in order
- 120 min
What Is Docker
Containers vs VMsImagesContainersDocker daemonDocker CLI - 225 min
Your First Container
Docker runHello-worldInteractive shellDocker psDocker stopDocker rm - 330 min
Images and the Dockerfile
FROMRUNCMDDocker buildDocker imagesDocker rmi - 435 min
Building Custom Images
COPYWORKDIRENVEXPOSELayer caching.dockerignore - 530 min
Container Networking
Published ports-p host:containerUser-defined networksContainer DNSDocker network - 630 min
Volumes and Persistence
Bind mountsNamed volumesContainer writable layerDocker volumeWhere data lives - 735 min
Docker Compose
Compose.yamlServicesDepends_onPort mappingDocker compose up/downNamed volumes in compose - 835 min
Multi-Stage Builds
Build stageRuntime stage--from=builderSlim final imagesAS aliasing - 925 min
Environment Variables and Secrets
ENV in Dockerfile-e at runEnv_file in composeWhy not to bake secretsDocker secrets brief mention - 1025 min
Healthchecks and Restart Policies
HEALTHCHECK directive--restart=unless-stoppedDocker inspect healthCompose healthcheck - 1130 min
Image Optimization and Security
Small bases like alpine and distrolessUSER non-rootPinning versionsDocker scoutTrivyMulti-arch idea - 1225 min
Registries and Publishing
Docker tagDocker loginDocker pushDocker HubGHCRPrivate registries - 1350 min
Capstone: Shipping a Stack
Multi-stage DockerfileCompose.yaml with two servicesHealthcheck and restart policyTag and pushRun elsewhere
Learn Docker in your language
Every lesson, quiz, and tutor reply renders in your language. The AI tutor matches the language you ask in.
Roles that use Docker
See how hiring teams interview engineers on Docker, in production-like environments.
DevOps Engineer
Hire DevOps engineers who actually ship. Run live or take-home interviews in production-like Linux environments with Docker, Kubernetes, Terraform and CI/CD. See how they debug, automate, and work alongside AI.
See the interviewPlatform Engineer
Hire platform engineers who reduce friction for every team. Real golden-path templates, real internal CLIs, real service onboarding flows. We record every step.
See the interviewSite Reliability Engineer (SRE)
Hire SREs who actually run production. Live workspaces with metrics, logs, traces and a service that is starting to misbehave. We record every keystroke.
See the interview