python - 在VS Code中调试dockerized Django会导致错误 “Timed out waiting for launcher to connect”

Question

我想使用Visual Studio Code中的docker容器调试Django应用程序。
Microsoft发布了指南，该指南是我逐步遵循的:
https://code.visualstudio.com/docs/containers/quickstart-python
但是，当我尝试运行调试器时，出现以下错误消息:

Timed out waiting for launcher to connect

这是我逐步执行的操作:

我使用django-admin startproject helloworld初始化了一个简单的Django应用程序

在VS Code中，我打开了包含manage.py的文件夹

打开命令面板Ctrl + Shift + P，然后选择Docker: Add Docker Files to Workspace...

选择应用程序平台Python: Django

包括Docker Compose文件No

应用程序入口点的相对路径manage.py

您的应用程序侦听哪些端口？ 8000

VS Codes然后创建了几个文件(见下文)。

当我尝试启动调试器时(如本指南中所述)，我收到以下错误消息:


终端不会显示任何错误消息，但是会执行以下命令:



.vscode / launch.json:

{
    "configurations": [
        {
            "name": "Docker: Python - Django",
            "type": "docker",
            "request": "launch",
            "preLaunchTask": "docker-run: debug",
            "python": {
                "pathMappings": [
                    {
                        "localRoot": "${workspaceFolder}",
                        "remoteRoot": "/app"
                    }
                ],
                "projectType": "django"
            }
        }
    ]
}

.vscode / tasks.json:

{
    "version": "2.0.0",
    "tasks": [
        {
            "type": "docker-build",
            "label": "docker-build",
            "platform": "python",
            "dockerBuild": {
                "tag": "dockerdebugging:latest",
                "dockerfile": "${workspaceFolder}/Dockerfile",
                "context": "${workspaceFolder}",
                "pull": true
            }
        },
        {
            "type": "docker-run",
            "label": "docker-run: debug",
            "dependsOn": [
                "docker-build"
            ],
            "python": {
                "args": [
                    "runserver",
                    "0.0.0.0:8000",
                    "--nothreading",
                    "--noreload"
                ],
                "file": "manage.py"
            }
        }
    ]
}

Dockerfile:

# For more information, please refer to https://aka.ms/vscode-docker-python
FROM python:3.8-slim-buster

EXPOSE 8000

# Keeps Python from generating .pyc files in the container
ENV PYTHONDONTWRITEBYTECODE 1

# Turns off buffering for easier container logging
ENV PYTHONUNBUFFERED 1

# Install pip requirements
ADD requirements.txt .
RUN python -m pip install -r requirements.txt

WORKDIR /app
ADD . /app

# Switching to a non-root user, please refer to https://aka.ms/vscode-docker-python-user-rights
RUN useradd appuser && chown -R appuser /app
USER appuser

# During debugging, this entry point will be overridden. For more information, please refer to https://aka.ms/vscode-docker-python-debug
CMD ["gunicorn", "--bind", "0.0.0.0:8000", "helloworld.wsgi"]

requirements.txt:

# To ensure app dependencies are ported from your virtual environment/host machine into your container, run 'pip freeze > requirements.txt' in the terminal to overwrite this file
django==3.0.3
gunicorn==20.0.4

VS代码版本:1.47.1

Python扩展版本:v2020.7.94776

Answer 1

我的问题是缺少包裹。 Docker通常工作正常，我之前从未遇到任何问题。
我最初按照官方文档中的描述安装了docker:
https://docs.docker.com/engine/install/ubuntu/
但是，当我尝试安装docker.io软件包后，在VS Code中调试工作正常:

sudo apt install docker.io