docker-compose.yml up 중 host error(1130)

docker-compose -f docker-compose.yml up --build 를 시도하니

django.db.utils.OperationalError: (1130, "Host '172.29.0.3' is not allowed to connect to this MySQL server")

이러한 error가 뜹니다.

검색해보니 host 접속권한(?)이 없는 것이라 해서 mysql root계정에 모든 host 접속을 허용해주었습니다...

version: '3'
services:

  db:
    container_name: db
    image: mysql:5.7
    restart: always
    environment:
      MYSQL_ROOT_HOST: '%'
      MYSQL_ROOT_PASSWORD: mysql
    expose:
      - 3306
    ports:
      - "3307:3306"
    env_file:
      - .env
    volumes:
      - dbdata:/var/lib/mysql

  web:
    container_name: web
    build: .
    command: sh -c "python manage.py migrate && python manage.py runserver 0.0.0.0:8000"
    environment:
      MYSQL_ROOT_PASSWORD: mysql
      DATABASE_NAME: mysql
      DATABASE_USER: 'root'
      DATABASE_PASSWORD: mysql
      DATABASE_PORT: 3306
      DATABASE_HOST: db
      DJANGO_SETTINGS_MODULE: dislodged_project.settings.dev
    restart: always
    ports:
        - "8000:8000"
    volumes:
      - .:/app
    depends_on:
      - db
volumes:
  app:
  dbdata:

무엇보다 지금까지 문제없이 잘 됐는데 갑자기 저 host 접속이 안된다고 떠서..이유를 모르겠습니다...

아니면 mysql을 재설치하면 해결될까요..?