Docker - Gitlab Runner - Docker Compose - DIND

docker-compose.yml

# Gitlab Runner DIND
version: '3.2'

services: 
  dind:
    restart: always
    privileged: true
    image: docker:17.09.0-ce-dind
    command: 
    - --storage-driver=overlay2
    expose:
      - 2375
      - 2376

  runner:
    restart: always
    image: gitlab/gitlab-runner:alpine
    volumes:
    - ./config:/etc/gitlab-runner:Z
    environment:
    - DOCKER_HOST=tcp://dind:2375

  register-runner:
    restart: 'no'
    image: gitlab/gitlab-runner:alpine
    volumes:
    - ./config:/etc/gitlab-runner:Z
    command:
    - register
    - --non-interactive
    - --locked=false
    - --name=Gitlab DIND Runner
    - --executor=docker
    - --docker-image=docker:17.09.0-ce-dind
    - --docker-volumes=/var/run/docker.sock:/var/run/docker.sock
    environment:
    - CI_SERVER_URL=https://gitlab.com/
    - REGISTRATION_TOKEN=<YOUR TOKEN HERE>