SkillCoded

Docker

Write a Dockerfile

Write a Dockerfile that chooses an explicit base, performs reproducible build work, copies bounded files, and defines a clear runtime command.

Beginner14 min read
Docker lessonContainer and orchestration foundationsPractice

UNTIMED COACHING

Practice before the pressure

Use feedback to correct the model, not merely memorize an option position.

GUIDED PRACTICE

Practice the lesson questions

Answer normal lesson questions without a timer. Every answer includes an explanation, and incorrect answers can be tried again before continuing.

CONCEPT MODELS

See the lesson as a system

Use these visual guides to connect the key ideas before answering the questions.

Connect the roles in Write a DockerfileKeep base stage, build instruction, copied input, and runtime command as separate workload roles.
Connect the roles in Write a DockerfileA topic-specific model connects four distinct roles used to reason about write a dockerfile.
Base packagePackage begins an image build stage
Build processProcess executes ordered image instructions
Source filesFiles enter from the build context
Startup commandCommand defines the default process
Verify Built artifactConnect built artifact with its topic-specific inspection, expected outcome, and protected workload boundary.
Verify Built artifactA verification model for write a dockerfile connects the final workload decision to its check, result, and protected boundary.
Image resultResult packages the reviewed runtime
Starting checkInspect image result
Expected resultConfirm image result
Safety boundaryProtect base package scope