Docker compose 使用环境变量

version: '2.2'

services:

  kong-database:
    image: postgres:9.5-alpine
    container_name: kong-database
    environment:
      - POSTGRES_USER=kong
      - POSTGRES_DB=kong
    healthcheck:
      test: "pg_isready -U kong && psql -d kong -U kong -c \"SELECT 1=1\""
      interval: 10s
      timeout: 5s
      retries: 5

  kong-migration:
    image: kong:${KONG_VERSION}
    container_name: kong-migration
    depends_on:
      kong-database:
        condition: service_healthy
    environment:
      - KONG_DATABASE=postgres
      - KONG_PG_HOST=kong-database
    command: sh -c "kong migrations up && touch migrations_run && sleep 30"
    healthcheck:
      test: "if [[ -f migrations_run ]] ; then exit 0; else exit 1; fi"
      interval: 10s
      timeout: 5s
      retries: 5

  kong:
    image: kong:${KONG_VERSION}
    container_name: kong
    depends_on:
      kong-migration:
        condition: service_healthy
    healthcheck:
      test: "kong health"
      interval: 10s
      timeout: 5s
      retries: 5
    environment:
      - KONG_DATABASE=postgres
      - KONG_PG_HOST=kong-database
      - KONG_ADMIN_LISTEN=0.0.0.0:8001
    ports:
      - 8001:8001
      - 8000:8000

  kong-dashboard:
    build: .
    container_name: kong-dashboard
    ports:
      - 8080:8080
    volumes:
      - .:/app:cached
      - /app/node_modules/
    depends_on:
      kong:
        condition: service_healthy
    entrypoint: ./docker/entrypoint_dev.sh

例如 ${KONG_VERSION} 将会被填充为 KONG_VERSION 的环境变量