version: "3.7" services: backend: build: backend image: docker.io/docker/back ports: - 80:8080 secrets: - db-password db: environment: MYSQL_DATABASE: example MYSQL_ROOT_PASSWORD_FILE: /run/secrets/db-password image: mysql:5.7 restart: always secrets: - db-password volumes: - db-data:/var/lib/mysql volumes: db-data: {} secrets: db-password: file: db/password.txt