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dockerfile-best-practices SKILL.md skillA

This file is byte-identical to the first copy the registry indexed. Same content hash, so the same checks give both the same grade.

dockerfile-best-practices from khaledsaeed18/dotclaude is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.

Install it, pinned

mdr add khaledsaeed18/dotclaude/dockerfile-best-practices@git:20260921.8d3f9eb

Pins git:20260921.8d3f9eb in mdr.lock. Pin the fingerprint instead.

Audit grade: A, 17 of 17 checks passed
Kind: SKILL.md skill
Repository: khaledsaeed18/dotclaude
Path: skills/engineering/dockerfile-best-practices/SKILL.md
Versions recorded: 1
Latest version: git:20260921.8d3f9eb, committed Sep 21, 2026
Size: 5,669 bytes
Repository stars: 5
License: MIT

Write or review a Dockerfile and compose setup for a production service: multi-stage builds that ship only the runtime, pinned base images, layer order for cache hits, non-root user, minimal image size, correct signal handling and health checks, secrets kept out of layers, and language-specific patterns for Node, Python, Go, and Java. Use when containerising a service, when images are large or slow to build, when a container ignores SIGTERM, or when a security scan flags the image.

Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.

What the file says

A production image contains exactly what the process needs to run, built reproducibly, running as a non-root user, and stopping cleanly when asked. Everything below follows from those four properties.

## Structure: multi-stage

```dockerfile
# syntax=docker/dockerfile:1.7
FROM node:22.11-bookworm-slim AS deps
WORKDIR /app
COPY package.json pnpm-lock.yaml ./
RUN corepack enable && pnpm install --frozen-lockfile --prod=false

FROM deps AS build
COPY . .
RUN pnpm build && pnpm prune --prod

FROM node:22.11-bookworm-slim AS runtime
ENV NODE_ENV=production
WORKDIR /app
RUN groupadd -r app && useradd -r -g app -d /app app
COPY --from=build --chown=app:app /app/node_modules ./node_modules
COPY --from=build --chown=app:app /app/dist ./dist
COPY --chown=app:app package.json ./
USER app
EXPOSE 3000
HEALTHCHECK --interval=30s --timeout=3s --start-period=10s CMD node dist/healthcheck.js
ENTRYPOINT ["node", "dist/server.js"]
```

Build stages hold compilers and dev dependencies; the runtime stage copies artifacts only.

## Rules

**Base images**
…

Read the whole file at its exact version.

How to install

The exact contents, by fingerprint

mdr add khaledsaeed18/dotclaude/dockerfile-best-practices@sha256:d7a07860e9927f06

The line at the top of this page pins the label git:20260921.8d3f9eb, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.

Badge

[![mdr](https://markdownregistry.com/badge/art_r63yvx32yhrlfnjm.svg)](https://markdownregistry.com/a/art_r63yvx32yhrlfnjm)

2 badge image fetches in 30 days. What the badge shows.

Versions

The registry has recorded 1 version of this file, committed on Sep 21, 2026.

version	committed	commit	size	audit
git:20260921.8d3f9eb latest	2026-09-21	8d3f9eb	5,669 B	A	view

Audit of the latest version

A 17 of 17 checks passed. Fixed automatic checks with no AI involved, so the same checks give the same answer every run.

pass: Frontmatter block present
pass: Frontmatter declares a name
pass: Frontmatter declares a description
pass: Size between 200 bytes and 200 KB (5669 bytes)
pass: No zero-width or bidi control characters
pass: No instruction hidden inside an HTML comment
pass: No link to an exfiltration or paste host
pass: No credential-shaped string
pass: No instruction to send local credentials anywhere
pass: No text hidden with inline styles
pass: No prompt-injection phrasing
pass: No curl or wget piped into a shell
pass: No recursive delete of root, home or parent
pass: No instruction to read or print local credentials
pass: No base64 blob over 200 characters
pass: No link to a raw IP address
pass: No script tag

Source

GitHub

khaledsaeed18/dotclaude · 5 stars · license MIT · pushed 2026-11-05 · branch main

API

GET https://markdownregistry.com/api/v1/artifacts/art_r63yvx32yhrlfnjm
GET https://markdownregistry.com/api/v1/resolve?ref=khaledsaeed18/dotclaude/dockerfile-best-practices
GET https://markdownregistry.com/api/v1/blob/d7a07860e9927f06341e932cd33b348a005a8f76ea2c5a3fec94dfa64f3c5bbd

Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.

Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.

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