I am running into an issue with my docker application. On my local network at home, I have a server running on ip address: 192.168.2.10. I wrote a NestJS application which connects to the MQTT server on my server to get some data. This all worked fine, until I containerized my application.

I do understand what’s going wrong, because the docker container is running in an entire different network system, so it can’t access something from outside his network. However, I thought that I could use the bridged network to get this to work, so I have the following config:

services:
  service:
    build:
      context: .
      dockerfile: Dockerfile
      target: development
    volumes:
      - ./logs:/usr/src/app/logs
      - .:/usr/src/app
    environment:
      - NODE_ENV=development
    networks:
      - my-application

networks:
  my-application:
    driver: bridge

But running this still gives me a connection timeout: Error: connack timeout, no matter if I put the bridged network or not, I receive the same error. I also tried setting a local DNS that I configured on my router, but the container also can’t reach my router of course.

What am I doing wrong and how can I fix this?