Docker for Windows - How to reach external host on the same LAN

user_3256843 0
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Docker for Windows newbie here.

I need one of the containers to reach a web server located in one of the machines of the same LAN (192.168.1.134) where the host machine resides (192.168.1.100), but I don't understand how to do it.

Containers are started via docker-compose, with a configuration like this :

version: '3.2'

services:
  myapp:
    image: 'docker.io/bitnami/codeigniter:latest'
    ports:
      - '8000:8000'
    volumes:
      - '.:/app'
    depends_on:
      - mariadb
  mariadb:
    volumes:
      - ./docker_data:/docker-entrypoint-initdb.d
    image: 'docker.io/bitnami/mariadb:10.3-debian-10'
    ports:
      - '3306:3306'
    environment:
      MARIADB_ROOT_PASSWORD: xxx
      MARIADB_DATABASE: xxx
      MARIADB_USER: xxx
     MARIADB_PASSWORD: xxx
  composer_installation:
    container_name: composer_installation
    image: composer
    volumes:
      - ./:/app
    command: composer install --ignore-platform-reqs

Containers can ping each other and I have outbound/inbound internet connectivity inside the containers, but I can't reach IPs in my LAN

I tried modifying docker-compose by adding

--extra_hosts:
  - "myotherhost:192.68.1.134"

to "myapp" container - I can see host added to /etc/hosts file, but I have no outbound connectivity.

I also tried to add network_mode: bridge , to every container configuration , but this way I lose communication between containers.

docker-compose docker
1 Answers

Just use network_mode as host

version: '3.2'

services:
  myapp:
    image: 'docker.io/bitnami/codeigniter:latest'
    volumes:
      - '.:/app'
    network_mode: "host"
    depends_on:
      - mariadb
  mariadb:
    volumes:
      - ./docker_data:/docker-entrypoint-initdb.d
    network_mode: "host"
    image: 'docker.io/bitnami/mariadb:10.3-debian-10'
    environment:
      MARIADB_ROOT_PASSWORD: xxx
      MARIADB_DATABASE: xxx
      MARIADB_USER: xxx
     MARIADB_PASSWORD: xxx
  composer_installation:
    container_name: composer_installation
    image: composer
    network_mode: "host"
    volumes:
      - ./:/app
    command: composer install --ignore-platform-reqs

Here I assumed all three containers need to connect to same LAN, if its for specific services, add network_mode: "host" to those services only.

user_37602160
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