Docker上でmongodbを動かす最小構成

mongo-docker-compose.yml

version: '3.1'
services:
  mongo:
    image:  mongo:4.0.8
    restart: always
    command: --smallfiles
    ports:
      - 27017:27017
    # environment:
    #   MONGO_INITDB_ROOT_USERNAME: root
    #   MONGO_INITDB_ROOT_PASSWORD: example
    volumes:
      - storage-data::/data/db
  mongo-express:
    image: mongo-express
    restart: always
    ports:
      - 8081:8081
    # environment:
    #   ME_CONFIG_MONGODB_ADMINUSERNAME: root
    #   ME_CONFIG_MONGODB_ADMINPASSWORD: example
volumes:
  storage-data: