app:
    ...
    depends_on:
      db:
      condition: service_healthy

db:
  ...
  healthcheck:
    test: TEST_GOES_HERE
    timeout: 20s
    retries: 10

version: "2.1"
services:
    api:
        build: .
        container_name: api
        ports:
            - "8080:8080"
        depends_on:
            db:
                condition: service_healthy
    db:
        container_name: db
        image: mysql
        ports:
            - "3306"
        environment:
            MYSQL_ALLOW_EMPTY_PASSWORD: "yes"
            MYSQL_USER: "user"
            MYSQL_PASSWORD: "password"
            MYSQL_DATABASE: "database"
        healthcheck:
            test: ["CMD", "mysqladmin" ,"ping", "-h", "localhost"]
            timeout: 20s
            retries: 10

# Your database
mydb:
  image: mysql
  ports:
    - "3306:3306"
  volumes:
    - yourDataDir:/var/lib/mysql

# Your server
myserver:
  image: myserver
  ports:
    - "....:...."
  entrypoint: ./wait-for-it.sh mydb:3306 -- ./yourEntryPoint.sh

mysql:
        image: mysql:5.6
        ports:
          - "3306:3306"
        volumes:
          # Preload files for data
          - ../schemaAndSeedData:/docker-entrypoint-initdb.d
        environment:
          MYSQL_ROOT_PASSWORD: rootPass
          MYSQL_DATABASE: DefaultDB
          MYSQL_USER: usr
          MYSQL_PASSWORD: usr
        healthcheck:
          test:  mysql --user=root --password=rootPass -e 'Design your own check script ' LastSchema

depends_on:
      mysql:
        condition: service_healthy