使用docker-compose run时，容器无法通过启动服务访问

Question

I have a docker-compose config like the following:

version: '3.7'
services:
  flask:
    command: [python, app.py]
    ports:
      - "127.0.0.1:5000:5000"
  frontend:
    command: [sh, -c, "npm run start"]
    ports:
      - "127.0.0.1:7600:7600"
    links:
      - flask

The frontend container has a webpack development server running which proxies /api/* path requests to flask:5000 for processing. This works great when I use docker-compose up -d .

However, let's say I want to debug something in the flask app using pdb , and I run it manually instead using:

docker-compose stop flask 
docker-compose run --rm --service-ports flask python app.py 

Then suddenly, my frontend service cannot proxy request to my flask service and I'm getting an error like: Error occurred while trying to proxy request /testing from frontend:7600 to http://flask:5000 (ECONNREFUSED) (https://nodejs.org/api/errors.html#errors_common_system_errors)

What am I missing? How do I make this configuration work for interactive debugging of my python code?

Edit: I'm running Docker version 18.09.0, build 4d60db4 and docker-compose version 1.23.2, build 1110ad01

Answer 1

The problem is when you run manually, the container name is no longer flask , you can see that with docker network inspect your_network .

You need to first docker-compose rm flask to free the name flask , then docker-compose run --service-ports --name flask flask .

Finally, I don't know how you use pdb , but you can normally use docker-compose exec flask sh or docker attach container_id to get an interactive prompt.