docker-basics SKILL.md skillA
docker-basics from mehranqadirian/skills is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add mehranqadirian/skills/docker-basics@git:20261104.b07e2c3Pins git:20261104.b07e2c3 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- mehranqadirian/skills
- Path
devops/docker-basics/SKILL.md- Versions recorded
- 1
- Latest version
- git:20261104.b07e2c3, committed Nov 4, 2026
- Size
- 3,299 bytes
- Repository stars
- 13
- License
- none declared
Reviews, writes and troubleshoots Dockerfiles and container builds. Use whenever the user shares a Dockerfile or docker-compose file, asks how to containerize an app, shrink an image, speed up builds, stop running as root, handle secrets in images, or debug a container that exits, cannot be reached or has permission errors, even if they only say "my docker build is slow". Lints with a script, explains each finding and proposes a safer version.
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
# docker-basics
Review a Dockerfile for security, size and build-cache problems, then fix it with patterns that work. The linter reads the file only; it never builds or runs anything.
```
docker-basics/
├── SKILL.md
├── scripts/
│ └── lint_dockerfile.py rules for root user, secrets, apt and pip cache, pinning, ADD, pipe-to-shell
└── references/
└── patterns.md solid images, multi-stage builds, .dockerignore, secrets, pinning, failures
```
## When to use
- Writing a Dockerfile for a new app
- Reviewing an existing Dockerfile before it ships
- Image too large, builds too slow, container runs as root
- A secret may have been baked into an image
- Container exits immediately, cannot be reached, or has file permission errors
## Workflow
1. **Lint**: `python3 scripts/lint_dockerfile.py Dockerfile`. Errors need fixing; warnings are likely problems; info is advice. Use `--strict` to fail on warnings.
2. **Explain each finding** in one sentence of why it matters, then show the fix. The most serious are secrets in `ENV` or `ARG`, `apt-get update` alone in a layer, and missing `-y`.
…Read the whole file at its exact version.
How to install
mdr add mehranqadirian/skills/docker-basics@sha256:c48ec35731c313ecThe line at the top of this page pins the label git:20261104.b07e2c3, 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.
[](https://markdownregistry.com/a/art_yosn3lodjho4kl25)
1 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 1 version of this file, committed on Nov 4, 2026.
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (3299 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
mehranqadirian/skills · 13 stars · license none declared · pushed 2026-11-04 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_yosn3lodjho4kl25 GET https://markdownregistry.com/api/v1/resolve?ref=mehranqadirian/skills/docker-basics GET https://markdownregistry.com/api/v1/blob/c48ec35731c313ec2d2e16862f5a22616c13c6d503dcd7980aca058f9877f5d5
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.