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tech-docker

Skill1 starsChanged 28 days agoMITView on GitHub

Technology skill loaded when writing or modifying Dockerfiles or docker-compose.yml.

  • Reads credentials

The file

We split this skill into the rules it gives an agent

5 rules. About 0 are common, 2 are distinctive, and 3 are very specific to this project.

  • ≈0

    Common · estimate

    Many files like this have a rule of this kind.

  • ≈2

    Distinctive · estimate

    This author's own choices. Worth a look.

  • 3

    Very specific

    Tied to their project's names, files or tools. Probably skip.

  • Common
  • Distinctive
  • Very specific
  1. Distinctive:

    When containerizing applications, optimize for image size, build speed, and security:

    line 11
  2. Distinctive:

    Multi-Stage Builds: Always use multi-stage builds for compiled languages or build steps (like Node/React) to keep the final production …

    line 13
  3. Very specific:

    Base Images: Use minimal base images (e.g., alpine, slim, or distroless) unless specific system dependencies are required.

    line 14
  4. Very specific:

    Security: Never run the application as the root user.

    line 16
  5. Very specific:

    Secrets: Never bake secrets or .env files into the image.

    line 17

≈ “Common” is an estimate: at least 1 in 5 of the 350,495 skill files we read have a rule of the same kind, not the same words. “Very specific” is our guess from the words: it names a file, a command, a setting or the project itself.

Keep what fits and drop the rest. Your version, ready for your agents.
Files
SKILL.md

Docker Best Practices

Apply this skill after inspecting repository conventions and supported versions. Treat its rules as defaults unless they protect a concrete safety property; preserve an established project pattern when it conflicts, and record the reason in the implementation plan.

When containerizing applications, optimize for image size, build speed, and security:

  1. Multi-Stage Builds: Always use multi-stage builds for compiled languages or build steps (like Node/React) to keep the final production image small.
  2. Base Images: Use minimal base images (e.g., alpine, slim, or distroless) unless specific system dependencies are required.
  3. Layer Caching: Order Dockerfile instructions from least frequently changed to most frequently changed. Copy package files (package.json, requirements.txt) and install dependencies before copying the source code.
  4. Security: Never run the application as the root user. Explicitly create and switch to a non-root USER.
  5. Secrets: Never bake secrets or .env files into the image. Use environment variables at runtime or Docker Secrets.

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Your trail

Files you open will collect here, so you can find them again.

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