mkdir mysql_server
cd mysql_server
sudo vim docker-compose.yml

version: "3" #版本信息
services: #服务列表
  mysql_1:
    image: mysql:5.7
    ports:
      - 3306:3306
    volumes:
      - "/root/mysql_server/node1/data:/var/lib/mysql"
      - "/root/mysql_server/node1/conf.d:/etc/mysql/conf.d"
    environment:
      - MYSQL_ROOT_PASSWORD=123456
    restart: always
  mysql_2:
    image: mysql:5.7
    ports:
      - 3307:3306
    volumes:
      - "/root/mysql_server/node2/data:/var/lib/mysql"
      - "/root/mysql_server/node2/conf.d:/etc/mysql/conf.d"
    environment:
      - MYSQL_ROOT_PASSWORD=123456
  restart: always
  mysql_3:
    image: mysql:5.7
    ports:
      - 3308:3306
    volumes:
      - "/root/mysql_server/node3/data:/var/lib/mysql"
      - "/root/mysql_server/node3/conf.d:/etc/mysql/conf.d"
    environment:
      - MYSQL_ROOT_PASSWORD=123456
  restart: always