Docker compose, running containers in net:host

Question

I want to spawn 3 services in the "host" net using docker-compose. Here is my docker-compose.yml file:

version: '2'
services:
  mysql:
    image: mysql
    net: "host"
  nginx:
    image: nginx
    net: "host"
  app:
    image: tomcat
    net: "host"

I got the following error:

$ docker-compose up
[31mERROR[0m: Validation failed in file '.\docker-compose.yml', reason(s):
Unsupported config option for services.app: 'net'
Unsupported config option for services.mysql: 'net'
Unsupported config option for services.nginx: 'net'

I'm using boot2docker on windows.

Docker, and Docker-compose version:

$ docker -v
Docker version 1.10.2, build c3959b1
$ docker-compose -version
docker-compose version 1.6.0, build cdb920a

If I run all services manually by using docker run --net = "host" everything is working fine.

In the documentation I read that net command is supported in docker-compose:

net

Networking mode. Use the same values as the docker client --net parameter.

net: "bridge"

net: "none"

net: "container:[name or id]"

net: "host"

https://docs.docker.com/v1.6/compose/yml/#net

What am I doing wrong?

Answer 1

Those documents are outdated. I'm guessing the 1.6 in the URL is for Docker 1.6, not Compose 1.6. Check out the correct syntax here: https://docs.docker.com/compose/compose-file/#network_mode. You are looking for network_mode when using the v2 YAML format.