version: '3'
services:

  mysql_master:
    image: mysql:5.7
    hostname: "mysql_master"
    container_name: mysql_master
    restart: always
    environment:
      MYSQL_ROOT_PASSWORD: root
      MYSQL_PORT: 3306
      MYSQL_LOWER_CASE_TABLE_NAMES: 0
    volumes:
      - ./mysql/mysql_master.conf:/etc/mysql/conf.d/mysql.conf.cnf
      - /opt/mysql_master:/var/lib/mysql

  mysql_slave1:
    image: mysql:5.7
    hostname: "mysql_slave1"
    container_name: mysql_slave1
    restart: always
    environment:
      MYSQL_ROOT_PASSWORD: root
      MYSQL_PORT: 3306
      MYSQL_LOWER_CASE_TABLE_NAMES: 0
    depends_on:
      - mysql_master
    volumes:
      - ./mysql/mysql_slave1.conf:/etc/mysql/conf.d/mysql.conf.cnf
      - /opt/mysql_slave1:/var/lib/mysql

  mysql_slave2:
    image: mysql:5.7
    hostname: "mysql_slave2"
    container_name: mysql_slave2
    restart: always
    environment:
      MYSQL_ROOT_PASSWORD: root
      MYSQL_PORT: 3306
      MYSQL_LOWER_CASE_TABLE_NAMES: 0
    depends_on:
      - mysql_master
    volumes:
      - ./mysql/mysql_slave2.conf:/etc/mysql/conf.d/mysql.conf.cnf
      - /opt/mysql_slave2:/var/lib/mysql