services: backend: build: backend secrets: - db-password depends_on: db: condition: service_healthy db: image: mysql:8.0.19 command: '--default-authentication-plugin=mysql_native_password' restart: always healthcheck: test: ["CMD", "mysqladmin", "ping", "-h", "127.0.0.1", "--silent"] interval: 3s retries: 5 start_period: 30s secrets: - db-password volumes: - db-data:/var/lib/mysql environment: - MYSQL_DATABASE=example - MYSQL_ROOT_PASSWORD_FILE=/run/secrets/db-password expose: - 3306 proxy: build: proxy ports: - 80:80 depends_on: - backend volumes: db-data: secrets: db-password: file: db/password.txt