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Docker and Docker Compose patterns for local development, container security, networking, volume strategies, and multi-service orchestration.
Passed 20 of 22 test cases with the skill, and 16 of 22 without it.
and 3 more in the full report
4 fixed16 passed either way2 still failing0 broke
Tokens, turns and time describe resource use, not a dollar price.
One of 4 test cases the skill fixed. Same model, same prompt, with and without the skill.
Write a healthcheck block for a postgres:16-alpine service in docker-compose.yml that tests database readiness every 5 seconds using pg_isready with a 3-second timeout and 5 retries.
| Checked | Without skill | With skill |
|---|---|---|
| The healthcheck command test is set to ["CMD-SHELL", "pg_isready -U postgres"]. | Missed | Passed |
| The healthcheck settings specify interval: 5s, timeout: 3s, and retries: 5. | Passed | Passed |
The instructions your model reads when the skill loads.
Docker and Docker Compose best practices for containerized development.
# docker-compose.yml
services:
app:
build:
context: .
target: dev # Use dev stage of multi-stage Dockerfile
ports:
- "3000:3000"
volumes:
- .:/app # Bind mount for hot reload
- /app/node_modules # Anonymous volume -- preserves container deps
environment:
- DATABASE_URL=postgres://postgres:postgres@db:5432/app_dev
- REDIS_URL=redis://redis:6379/0
- NODE_ENV=development
depends_on:
db:
condition: service_healthy
redis:
condition: service_started
command: npm run dev
db:
test cases passed, vs 16 / 22 without
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