Can't make requests from other containers in the same docker network

[jussirantala]

I have a Python script which uses ib_async.

When I run ghcr.io/gnzsnz/ib-gateway:stable with docker compose, I can successfully connect to it from my Python script and do requests by using localhost:8888.

If I run the Python script in Docker using the same docker compose file (and the same default network), the script will get connection refused error for all requests.

The port is opened with 127.0.0.1:8888:4003 and I use live account. I connect to it by using its container name and port 8888 as supposed to. I do receive some stuff from the container when connecting, just can't make any requests for example for getting open positions.

I don't have this issue with any other dockerized IB GWs (for example this) so it must be a bug I guess?

[gnzsnz]

This works fine, i use it every day. there must be an error on your docker-compose or in the way you are using the API.

what do you mean by localhost:8888 or 127.0.0.1:8888:4003, I can't help you the level of detail provided.

Regarding how to use a script in as a separate service, please check #83 for an example

[jussirantala]

Docker compose:

version: "3.4"
services:
  ib-insync-trader:
    container_name: ib-insync-trader
    build:
      context: ./ib-insync
      dockerfile: Dockerfile.develop
    ports:
      - 5005:5005
    volumes:
      - ./ib-insync/app.py:/app/app.py
    restart: always
    environment:
     - IB_PORT=8888
     - PORT=5005
     - IB_ACCOUNT=UXXXXXXXX
     - CLIENT_ID=0
     - IB_HOST=ib-gateway
    ports: 
      - "127.0.0.1:5005:5005"
    healthcheck:
        test: "curl -X GET --fail http://localhost:5005/health -k || exit 1"
        interval: 10s
        timeout: 5s
        start_period: 3s     
    stdin_open: true # docker run -i
    tty: true        # docker run -t    
  ib-gateway:
    container_name: ib-gateway
    restart: always
    image: ghcr.io/gnzsnz/ib-gateway:stable
    env_file:
      - ./envs/agent/ib2.env
    ports:
      - "127.0.0.1:8888:4003"

If I run the docker compose and use my python script outside docker (just with python3 ./app.py) and connect to localhost:8888, it works fine so the GW configuration is ok.

But if I use the python script inside the above docker compose, it tries ib-gateway:8888 but all requests get Connection refused error.

If I replace IB GW with for example this other docker image, there's no issues inside docker network.

[jussirantala]

Have you ever tried it with mapping the port number to another number like I do? Maybe I should try 127.0.0.1:4003:4003 and see if it works.

[jussirantala]

@gnzsnz It seems that it doesn't work if port number is mapped to another.

I replaced "127.0.0.1:8888:4003" with "127.0.0.1:4003:4003" and now I can connect fine to ib-gateway:4003.

EDIT: Though after a while I started to see this in IB GW after every request and I have to keep restarting it:
2025/01/17 14:25:32 socat[451] E connect(5, AF=2 127.0.0.1:4001, 16): Connection timed out