Auto start docker container w/ docker-compose in CoreOS

Prepare init script

To keep cloud-config.yml simple call init.sh only.

$ cd /path/to/docker-compose/project
$ vim init.sh

#!/bin/bash -ex

cd $(dirname $0)
/opt/bin/docker-compose $1

$ chmod +x init.sh

Register init script to cloud-config

$ sudo vim /usr/share/oem/cloud-config.yml

#cloud-config

coreos:
  units:
    - name: docker-xxx.service
      command: start
      content: |
        [Unit]
        Description=Xxx container
        After=docker.service

        [Service]
        Restart=always
        ExecStart=/path/to/docker-compose/project/init.sh start
        ExecStop=/path/to/docker-compose/project/init.sh stop