version: "3.0" services: redis: image: redis ports: - 6379:6379 mongo: image: mongo environment: MONGO_INITDB_ROOT_USERNAME: root MONGO_INITDB_ROOT_PASSWORD: example ports: - 27017:27017 mongo-express: image: mongo-express ports: - 8081:8081 environment: ME_CONFIG_MONGODB_ADMINUSERNAME: root ME_CONFIG_MONGODB_ADMINPASSWORD: example ME_CONFIG_MONGODB_URL: mongodb://root:example@mongo:27017/