Create docker-compose1.yaml #56
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WalkthroughA new Docker Compose configuration file has been added, defining two services: a Django-based web application and a PostgreSQL database. The configuration specifies build instructions, environment variable loading, port mappings, persistent storage for the database, and service dependencies. Changes
Sequence Diagram(s)sequenceDiagram
participant User
participant Web (Django)
participant DB (PostgreSQL)
User->>Web (Django): HTTP request on port 8000
Web (Django)->>DB (PostgreSQL): Connect using env credentials
DB (PostgreSQL)-->>Web (Django): Query result
Web (Django)-->>User: HTTP response
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Actionable comments posted: 2
🧹 Nitpick comments (3)
docker-compose1.yamel (3)
4-10: Mounting the entire project directory can pollute the container image`volumes:
- .:/app` is handy for live reload in development, but it:
- Masks the files baked into the image, making builds non-reproducible.
- Leaks host artefacts (.venv, build caches, etc.) into the container.
- Makes the image unsuitable for staging/production.
Prefer a profile-gated bind mount or drop it entirely for non-dev stacks:
web: build: . command: python manage.py runserver 0.0.0.0:8000 - volumes: - - .:/app + profiles: ["dev"] # Only enabled with `--profile dev` + volumes: + - type: bind + source: . + target: /app
16-26: Pass database secrets via Docker secrets rather than plain env varsPlacing passwords in
environment:exposes them viadocker inspectand process lists. Use secrets, or at minimum rely solely on.env:- environment: - POSTGRES_DB: ${POSTGRES_DB} - POSTGRES_USER: ${POSTGRES_USER} - POSTGRES_PASSWORD: ${POSTGRES_PASSWORD} - env_file: - - .env + env_file: .env # keeps them out of compose file +# # Prefer: +# secrets: +# - postgres_password
27-29: Nit: declare volume driver/opts to avoid permission surprisesExplicitly pin the driver (e.g.,
local) and map ownership if SELinux or UID mismatches are a concern:volumes: postgres_data: driver: local driver_opts: o: bind type: none device: ${PWD}/.docker/postgres_data
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| version: '3.9' | |||
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Incorrect file extension prevents automatic discovery by Docker Compose
Docker Compose only auto-detects docker-compose.yml or docker-compose.yaml.
Naming the file docker-compose1.yamel means every command must be run with -f docker-compose1.yamel, breaking standard tooling and docs.
Rename the file to docker-compose.yml / .yaml, or adjust CI scripts accordingly.
🤖 Prompt for AI Agents
In docker-compose1.yamel at line 1, the file extension is incorrect and prevents
Docker Compose from automatically discovering the file. Rename the file from
docker-compose1.yamel to docker-compose.yml or docker-compose.yaml to align with
Docker Compose conventions and enable standard tooling and documentation to work
without additional flags.
| env_file: | ||
| - .env | ||
| depends_on: | ||
| - db | ||
|
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🛠️ Refactor suggestion
depends_on doesn’t wait for Postgres to accept connections
depends_on: - db assures start order, not readiness. Django will crash if it connects too early.
Add a health check to db and gate web on it:
services:
web:
@@
- depends_on:
- - db
+ depends_on:
+ db:
+ condition: service_healthy
@@
db:
@@
+ healthcheck:
+ test: ["CMD-SHELL", "pg_isready -U ${POSTGRES_USER}"]
+ interval: 10s
+ retries: 5🤖 Prompt for AI Agents
In docker-compose1.yamel around lines 11 to 15, the depends_on setting only
ensures the db container starts before web but does not wait for the database to
be ready to accept connections, causing Django to potentially crash. Add a
healthcheck section to the db service that tests if Postgres is ready, then
modify the web service to depend on the db service's health status instead of
just its start order. This will ensure the web service waits until the database
is fully ready before starting.
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