Files
Florian Wilde 75e99f75c6 feat: make "only the app publishes a port" a binding rule
A published database port puts the data on the public internet, and Docker's
own iptables rules bypass ufw — the server looks firewalled while the port is
open. Previously this was only a comment in compose.yaml, which an agent adding
a db service later is free to ignore.

Anchored at every point where a service could be added or shipped:
- rules/security.md: the rule, the reasoning, and the audit commands
- rules/backend.md + architecture SKILL: constraint when picking the data layer
- agents/backend-dev.md: non-negotiable for any service it adds
- agents/qa-engineer.md: a published port is a Critical finding
- skills/deploy: blocking pre-flight audit
- compose.yaml: db example now uses expose:, with depends_on healthcheck
- docs/DEPLOYMENT.md + README: SSH tunnel instead of publishing for debugging
2026-08-09 01:12:06 +02:00

67 lines
1.9 KiB
YAML

services:
app:
build:
context: .
dockerfile: Dockerfile
image: ${APP_NAME:-ai-coding-starter}:latest
container_name: ${APP_NAME:-ai-coding-starter}
restart: unless-stopped
env_file:
- .env
environment:
NODE_ENV: production
PORT: 3000
ports:
# Bound to loopback: the reverse proxy on the host forwards to this.
# Set APP_BIND=0.0.0.0 in .env only if the port must be publicly reachable.
- "${APP_BIND:-127.0.0.1}:${APP_PORT:-3000}:3000"
healthcheck:
test:
- CMD
- node
- -e
- "fetch('http://127.0.0.1:3000/api/health').then(r=>process.exit(r.ok?0:1)).catch(()=>process.exit(1))"
interval: 30s
timeout: 5s
start_period: 20s
retries: 3
logging:
driver: json-file
options:
max-size: "10m"
max-file: "3"
# A database is deliberately not part of this template — /architecture picks one
# per project.
#
# RULE FOR EVERY SERVICE ADDED BELOW: only `app` gets a `ports:` entry. Databases,
# caches and queues get none — the app reaches them by service name over this
# compose network (`db:5432`). Publishing 5432 puts the database on the public
# internet, and Docker's iptables rules bypass ufw, so the server only *looks*
# firewalled. See .claude/rules/security.md.
#
# db:
# image: postgres:17-alpine
# restart: unless-stopped
# environment:
# POSTGRES_PASSWORD: ${POSTGRES_PASSWORD:?set POSTGRES_PASSWORD in .env}
# POSTGRES_DB: ${POSTGRES_DB:-app}
# expose:
# - "5432" # documentation only — NOT reachable from the host
# volumes:
# - db-data:/var/lib/postgresql/data
# healthcheck:
# test: ["CMD-SHELL", "pg_isready -U postgres"]
# interval: 10s
# timeout: 5s
# retries: 5
#
# Then make the app wait for it:
# app:
# depends_on:
# db:
# condition: service_healthy
#
# volumes:
# db-data: