Mysql Replication in docker

.env

DB_PORT=
DB_DATABASE=
DB_USERNAME=
DB_PASSWORD=

docker-compose.master.yml

version: '3'
services:

  db:
    image: mysql:8.0
    container_name: db
    restart: always
    ports: 
      - $DB_PORT:3306
    command: 
      - --default-authentication-plugin=mysql_native_password
    volumes:
      - ./master.conf.cnf:/etc/mysql/conf.d/mysql.conf.cnf
      - db:/var/lib/mysql
    environment:
       MYSQL_ROOT_PASSWORD: ${DB_PASSWORD}
       MYSQL_PASSWORD: ${DB_PASSWORD}
       MYSQL_USER: ${DB_USERNAME}
       MYSQL_DATABASE: ${DB_DATABASE}
    networks:
      - internal
  adminer:
    image: adminer:latest
    restart: always
    ports: 
      - "8081:8080"
    networks:
      - internal
      
#Docker Networks
networks:
  internal:

#Volumes
volumes:
  db:

docker-compose.slave.yml

version: '3'
services:
  mysql_slave:
    image: mysql:8.0
    environment:
       MYSQL_ROOT_PASSWORD: ${DB_PASSWORD}
       MYSQL_PASSWORD: ${DB_PASSWORD}
       MYSQL_USER: ${DB_USERNAME}
       MYSQL_DATABASE: ${DB_DATABASE}
    container_name: "mysql_slave"
    restart: "always"
    ports:
      - $MYSQL_PORT:3306
    volumes:
      - ./slave.conf.cnf:/etc/mysql/conf.d/mysql.conf.cnf
      - data:/var/lib/mysql
    networks:
      - internal

  adminer:
    image: adminer:latest
    restart: always
    ports: 
      - "8080:8080"
    networks:
      - internal


#Docker Networks
networks:
  internal:

#Volumes
volumes:
  db:

master.conf.cnf

[mysqld]
server-id = 1
log-bin = mysql-bin-1.log
binlog_format = ROW
binlog_do_db = bit24

tmpdir = /tmp
max_binlog_size = 500M
sync_binlog = 1
expire-logs-days = 3
slow_query_log