Amazon web services 无法访问mautic容器

docker容器无法连接到AWS RDS数据库，也无法从NS访问。ec2可以使用endpoint完美地访问AWS MySQL RDS，但docker无法

    dockerman@ip-172-31-10-104:~$ docker ps
CONTAINER ID   IMAGE                  COMMAND                  CREATED          STATUS          PORTS                  NAMES
676d435f74c2   mautic/mautic:latest   "/entrypoint.sh apac…"   21 seconds ago   Up 19 seconds   0.0.0.0:8080->80/tcp   mautic

我的docker文件是：

version: '3.3'

services:

  mautic:
    image: mautic/mautic:latest
    container_name: mautic
    ports:
      - 8080:80
    volumes:
      - mautic_data:/var/www/html
    environment:
      - MAUTIC_DB_HOST=someawss3ecr3tendpoint.ap-s3cr38-1.rds.amazonaws.com
      - MYSQL_PORT_3306_TCP=3306
      - MAUTIC_DB_USER=s3cre8db
      - MAUTIC_DB_PASSWORD=s3cr3tpwd
      - MAUTIC_DB_NAME=s3crededdb_name
      - MAUTIC_RUN_CRON_JOBS=true
    networks:
      - mautic-net

volumes:
  mautic_data:
    driver: local
networks:
  mautic-net:
    driver: bridge

如何使用docker在EC2上执行操作，以便在创建容器期间与rds连接

提前谢谢