docker-compose network_mode: "host" doesn't seem to work

Question

I try to build containers with a docker-compose.yml file :

version: '2'

services:
     geonode:
        build: 
            context: .
        hostname: geonode
        container_name: geonode
        ports:
            - 8000:8000
        volumes:
            - .:/geonode/
        entrypoint:
            - /usr/bin/python
        command: manage.py runserver 0.0.0.0:8000
        network_mode: host

In my Dockerfile I run apt-get update after FROM ubuntu:14.04 but it fails : Could not resolve 'archive.ubuntu.com'

I tried docker run -i -t --net=host ubuntu:14.04 /bin/bash and then run apt-get update and it works. So it seems to me that the network_mode in docker-compose and the --net=host with docker run don't work the same way.

Does somebody has an explanation?

Answer 1

It works at least in version 3.7 when doing:

services:
    my-app:
        container_name: my-app
        build: 
            context: .
            network: host
        network_mode: host
        command: /app/my-app

The ports are obsolete as all ports are "exposed".