--- version: '2.1' services: mysql: image: mysql:5.7 environment: - MYSQL_DATABASE=will_paginate - MYSQL_ALLOW_EMPTY_PASSWORD=true ports: - 3307:3306 postgres: image: postgres:11 environment: - POSTGRES_DB=will_paginate - POSTGRES_PASSWORD=postgres ports: - 5433:5432 mongodb: image: mongo:4.2 ports: - 27018:27017