docker

Production guidelines for Docker, a tool that packages applications and their dependencies into isolated containers. They focus on creating small, repeatable images with fewer security risks.

In plain words
What is it for?
Writing Dockerfiles, choosing fixed base-image versions, using multi-stage builds, improving build caching, setting up non-root users and health checks, and preparing .dockerignore files.
Why use it?
They prevent common deployment problems such as unpinned software versions, containers running as root, leaked secrets, oversized images, and missing health checks.

Cursor rule

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods
npx agentmods add rules/patrickjs/awesome-cursorrules/docker
Clone the repo
git clone --depth 1 https://github.com/PatrickJS/awesome-cursorrules
Per session 0 Nothing until a file matches its globs; then the whole rule loads.
When invoked 308 The whole file, excluding the scripts and references it only reads on demand.
Security scan B 1 finding. Scan, not verified.
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5 $0.00000 $0.00308
Opus 5 $0.00000 $0.00154
Sonnet 5 $0.00000 $0.00062
Haiku 4.5 $0.00000 $0.00031

Measured 2d ago against content hash 5735ca607cf1, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade B, and why

docker scanned grade B with 1 finding against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Asks for rootmediumPrivilege escalation

A mod that escalates privileges can change anything on the machine, not only the project.

- Never run as root
Origin

Copies of this mod

1 near-identical copy found in the catalogue:

  • docker — 89% identical, 1 lines differ
rules/docker.mdc · 44 lines

What it actually says

Docker Rules

Expert Docker practitioner. Minimal, secure, reproducible images.

Dockerfile

  • Pin versions: FROM node:20.11-alpine3.19 (never :latest)
  • Multi-stage builds for compiled languages
  • Layer cache: copy package files → install → copy source
  • Combine RUN commands with && to minimize layers
  • USER non-root before CMD
  • HEALTHCHECK on all services
  • COPY --chown=appuser:appuser for file ownership

Security

  • Never run as root
  • No secrets in Dockerfile or image layers
  • No .env files copied into image
  • Scan with docker scout or trivy in CI

.dockerignore

  • Always present: node_modules, .git, .log, .env, test files

Volumes

  • Named volumes for persistence
  • Bind mounts for dev only, never production

Networking

  • Custom bridge networks, not host networking
  • Reference services by name in compose

Logging

  • Always stdout/stderr — never log to files inside container

Forbidden

  • No :latest tags in production
  • No ADD when COPY works
  • No root user in production
  • No secrets in build args or image layers
Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 2d ago First seen · 44 lines · 0 tokens per session scan B 5735ca607cf1

Subscribe to this mod's changes

docker is a cursor rule published in the GitHub repository PatrickJS/awesome-cursorrules (40,694 stars, last pushed 3mo ago), licensed CC0-1.0. It costs nothing until one of its globs matches a file; then it loads 308 tokens. A static security scan graded it B with 1 finding (asks for root). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.