MySQL Docker Setup for Replication

docker-compose.yml

version: '3.5'

services:
  db-master:
    image: mysql
    command: --default-authentication-plugin=mysql_native_password
    restart: always
    environment:
      MYSQL_ROOT_PASSWORD: password
    ports:
      # <Port exposed> : < MySQL Port running inside container>
      - '3306:3306'
    expose:
      # Opens port 3306 on the container
      - '3306'
    volumes:
      - mysql-db-master:/var/lib/mysql
    networks:
      internal:
        aliases:
          - mysql 

  db-1:
    image: mysql
    command: --default-authentication-plugin=mysql_native_password
    restart: always
    environment:
      MYSQL_ROOT_PASSWORD: password
    ports:
      # <Port exposed> : < MySQL Port running inside container>
      - '3307:3306'
    expose:
      # Opens port 3306 on the container
      - '3306'
    volumes:
      - mysql-db-1:/var/lib/mysql
      - ./my1conf:/etc/mysql/conf.d
    networks:
      internal:

  db-2:
    image: mysql
    command: --default-authentication-plugin=mysql_native_password
    restart: always
    environment:
      MYSQL_ROOT_PASSWORD: password
    ports:
      # <Port exposed> : < MySQL Port running inside container>
      - '3308:3306'

    expose:
      # Opens port 3306 on the container
      - '3306'
    volumes:
      - mysql-db-2:/var/lib/mysql
      - ./my2conf:/etc/mysql/conf.d
    networks:
      internal:

volumes:
  mysql-db-master:
  mysql-db-1:
  mysql-db-2:

networks:
  internal:
    driver: bridge

my1.cnf

[mysqld]
server-id=2
replicate-do-db = sakila
replicate-ignore-table=sakila.country

my2.cnf

[mysqld]
server-id=3
replicate-do-db = sakila
replicate-ignore-table=sakila.customer