Docker HTTP-requests between containers

问题:

I'm at the first stage in learning how to use Docker so I'm trying basic things. I've created two Node Express services that need to exchange data via HTTP-requests.

My docker-compose.yml file

networks:
  isolation-network:
    driver: bridge

services:
  service1-nodejs:
    build:
    context: ./service1/
    dockerfile: .docker/node.dockerfile
    ports:
      - "10000:9000" 
      - "10001:5858" 
    env_file: ./service1/.docker/env/app.${APP_ENV}.env
    networks:
      - isolation-network

  service2-nodejs:
    build:
    context: ./service2/
    dockerfile: .docker/node.dockerfile
    ports:
      - "10010:9000" 
      - "10011:5858" 
    env_file: ./service2/.docker/env/app.${APP_ENV}.env
    networks:
      - isolation-network

service1 uses the request module to make a POST-request to service 2.

request({ url: "http://service2:10010/api/",
                method: "POST",
                headers: { "Content-Type": "application/json" },
                json: true,
                body: { ... },
                time: true
            }, function (err, res, body) {
                if (!err && res.statusCode == 200) {
                    // success
                }

                // failed
            });

The result of this call is:

{ Error: connect ECONNREFUSED 172.18.0.3:10010}

Using postman I can test service2 at http://localhost:10010/api/ and I can confirm they actually can be reached and work as expected.

I'm missing something but can't figure it out. What is going wrong here?

回答1:

See the document. The port 10010 is a host port but not container port. You should use 9000 when you access service2 container directly.

So just change "http://service2:10010/api/" to "http://service2:9000/api/" and it will work.