Error : "[Errno 111] Connection refused ERROR: 1" on the client side of a server-client connection refusing to connect

I’m trying to build an app that uses a tcp socket client-server communication. As such I’ve got 3 dockers - 1st for the server, 2nd for the client and 3rd for the tests(which work btw). Besides the client(that uses python), everything is coded on C++.
The code goes as follows:

Yaml code:

version: "3.9"

services:
  server:
    build:
      context: .
      dockerfile: src/server_folder/Dockerfile
    container_name: cpp_server
    volumes:
      - ./data:/app/data
    networks:
      - server_client_network
    ports:
      - "12345:12345"
    restart: unless-stopped
    stdin_open: true
    tty: true

  tests:
    build:
      context: .
      dockerfile: src/tests/Dockerfile
    container_name: cpp_tests
    volumes:
      - ./data:/app/data
    networks:
      - server_client_network
    ports:
      - "5555:5555"
      - "5556:5556"
    command: ./build/Run_TDD
    stdin_open: true
    tty: true

  client:
    build:
      context: .
      dockerfile: src/client_folder/Dockerfile
    container_name: python_client
    networks:
      - server_client_network
    restart: "no"
    stdin_open: true
    tty: true

networks:
  server_client_network:
    driver: bridge
  
volumes:
  data:

server docker code:

FROM gcc:latest

RUN apt-get update && apt-get install -y cmake

COPY src/server_folder /app/src/server_folder
COPY src/tests /app/src/tests
COPY data /app/data
COPY CMakeLists.txt /app

WORKDIR /app

RUN mkdir build

WORKDIR /app/build

RUN cmake .. && make

ENTRYPOINT ["./app"]

client docker:


FROM python:3.10-slim

WORKDIR /client 

COPY src/client_folder/Client.py .

ENTRYPOINT ["python3", "Client.py"]

Well, how are you trying to connect, which hostname or IP do you use?

Note that you create an “image” and then run it as a “container”. “Dockers” are shoes :wink:

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