Concourse CI working with Docker Compose V3 syntax.

docker-compose-v3.yml

version: "3"

services:
  concourse-db:
    image: postgres:9.5
    environment:
    - POSTGRES_DB=concourse
    - POSTGRES_USER=concourse
    - POSTGRES_PASSWORD=changeme
    - PGDATA=/database
    volumes:
    - concourse-db-data:/database

  concourse-web:
    image: concourse/concourse
    command: web
    depends_on:
    - concourse-db
    environment:
    - CONCOURSE_BASIC_AUTH_USERNAME=concourse
    - CONCOURSE_BASIC_AUTH_PASSWORD=changeme
    - CONCOURSE_EXTERNAL_URL="http://10.0.1.38:8080"
    - CONCOURSE_POSTGRES_DATA_SOURCE=postgres://concourse:changeme@concourse-db:5432/concourse?sslmode=disable
    ports:
    - "8080:8080"
    volumes:
    - ./keys/web:/concourse-keys

  concourse-worker:
    image: concourse/concourse
    command: worker
    privileged: true
    environment:
    - CONCOURSE_TSA_HOST=concourse-web
    - CONCOURSE_BAGGAGECLAIM_ADDRESS=concourse-worker
    - CONCOURSE_BAGGAGECLAIM_FORWARD_ADDRESS=concourse-worker
    - CONCOURSE_GARDEN_ADDRESS=concourse-worker
    - CONCOURSE_GARDEN_FORWARD_ADDRESS=concourse-worker
    # These two lines below are important - you only need one, but this is what makes things work!
    # I preferred to keep both values in so there's a fallback. You can specify it more than once.
    - CONCOURSE_GARDEN_DNS_SERVER=8.8.8.8
    - CONCOURSE_GARDEN_DNS_SERVER=8.8.4.4
    depends_on:
    - concourse-web
    volumes:
    - ./keys/worker:/concourse-keys

volumes:
  concourse-db-data:
    driver: local