MYSQL, phpmyadmin, backup

docker-compose.yml

version: '2'
services:
  mysql_db_master:
    image: mysql:5.7
    # command: --default-authentication-plugin=mysql_native_password
    environment:
      MYSQL_ROOT_PASSWORD: ${MYSQL_ROOT_PASSWORD}
      MYSQL_USER: ${MYSQL_USER}
      MYSQL_PASSWORD: ${MYSQL_PASSWORD}
      MYSQL_DATABASE: lms
      REPLICATION_USER: ${REPLICATION_USER}
      REPLICATION_PASSWORD: ${REPLICATION_PASSWORD}
      MYSQL_ROOT_HOST: 0.0.0.0
    ports:
      - 3306:3306
    volumes:
      - ./mysql_db_data_container:/var/lib/mysql
      - ./mysql_slave:/var/slavedb
    networks:
        network:
            ipv4_address: 172.20.0.2
  mysql_db_slave:
    image: mysql:5.7
    # command: --default-authentication-plugin: mysql_native_password
    environment:
      MYSQL_ROOT_PASSWORD: ${MYSQL_SLAVE_ONE_ROOT_PASSWORD}
      MYSQL_USER: ${MYSQL_SLAVE_ONE_USER}
      MYSQL_PASSWORD: ${MYSQL_SLAVE_ONE_PASSWORD}
      MYSQL_DATABASE: lms
      REPLICATION_USER: ${REPLICATION_SLAVE_ONE_USER}
      REPLICATION_PASSWORD: ${REPLICATION_SLAVE_ONE_PASSWORD}
      MYSQL_ROOT_HOST: 0.0.0.0
    ports:
      - 3307:3306
    volumes:
      - ./mysql_db_data_slave:/var/lib/mysql
      - ./mysql_slave:/var/masterdb
    links: 
      - mysql_db_master
    networks:
        network:
            ipv4_address: 172.20.0.3
  phpmyadmin_container:
    image: phpmyadmin/phpmyadmin
    # command: --default-authentication-plugin=mysql_native_password
    environment:
      PMA_HOST: ${DOCKER_HOST_IP}
      MYSQL_USER: root
      MYSQL_PASSWORD: admin
      MYSQL_ROOT_PASSWORD: admin
    ports:
      - 8088:80
    volumes:
      - ./phpmyadmin:/etc/phpmyadmin
    networks:
        network:
            ipv4_address: 172.20.0.4

  mysql-cron-backup:
    image: fradelg/mysql-cron-backup
    depends_on:
      - mysql_db_master
    volumes:
      - ${VOLUME_PATH}/backup:/backup
    environment:
      - MYSQL_HOST=${DOCKER_HOST_IP}
      - MYSQL_USER=root
      - MYSQL_PASS=${MYSQl_ROOT_PASSWORD}
      - MAX_BACKUPS=15
      - INIT_BACKUP=1
      # Every day at 03:00
      - CRON_TIME=0 3 * * *
    restart: unless-stopped


networks:
    network: #will be prefixed with 'parent_dir_name_' so for me, it will be 'mysql_network'
        ipam:
            config:
                - subnet: 172.20.0.0/16