Docker-Compose目录配置问题：Python容器构建后找不到manage.py

Looks like your container can’t find manage.py because your project files aren’t being copied into the right directory inside the container, or your working directory isn’t set correctly. Let’s fix this step by step:

1. Fix Your Dockerfile #

Since your Dockerfile lives in the python subfolder, you need to reference the django.testsite directory (where manage.py lives) using a relative path. Here’s an updated, functional Dockerfile:

# Use an official Python runtime as the base image
FROM python:3.9-slim

# Set the default working directory inside the container
WORKDIR /app

# If you have a requirements.txt, copy it first to leverage Docker's build cache
COPY ../django.testsite/requirements.txt .
RUN pip install --no-cache-dir -r requirements.txt

# Copy the entire Django project from your local `django.testsite` folder to the container's /app directory
COPY ../django.testsite/ .

# Run the Django dev server, binding to 0.0.0.0 so it's accessible outside the container
CMD ["python", "manage.py", "runserver", "0.0.0.0:5000"]

2. (Optional) Simplify Paths with docker-compose.yml Adjustment #

You can also set the build context to your project root folder in docker-compose.yml, which makes paths in your Dockerfile more intuitive. Update your docker-compose.yml like this:

version: '3'
services:
  web:
    build:
      context: .  # Sets the build context to your project root (folder_project)
      dockerfile: ./python/Dockerfile  # Points to your Dockerfile in the python subfolder
    ports:
      - "5000:5000"
  redis:
    image: redis:alpine  # Replace with your actual Redis image

Then simplify your Dockerfile to use paths relative to the project root:

FROM python:3.9-slim

WORKDIR /app

COPY django.testsite/requirements.txt .
RUN pip install --no-cache-dir -r requirements.txt

COPY django.testsite/ .

CMD ["python", "manage.py", "runserver", "0.0.0.0:5000"]

Why This Fixes the Issue #

• WORKDIR /app sets the default directory where your container runs commands, so when you execute python manage.py, it looks for the file directly in /app.
• The COPY commands ensure all files from your local django.testsite folder (including manage.py) are copied into the container’s /app directory.
• Binding the server to 0.0.0.0:5000 ensures the Django server is accessible from outside the container, matching the port mapping in your docker-compose.yml.

After making these changes, rebuild your image and restart the containers with:

docker-compose down && docker-compose build && docker-compose up

内容的提问来源于stack exchange，提问作者S. Dior