Docker 连接在管理员和更新程序机器之间不起作用

我正在尝试设置两台机器，以便一台托管数据库，另一台接收更新。如果我在 PC 上运行更新机器，那么一切正常（在 PC 上，更新程序的配置与机器上的完全相同），但只要我在第二台机器上运行它：

{
    "level": "error",
    "error": "Get http://IP/client/config: dial tcp IP:80: i/o timeout",
    "time": "2019-12-06T09:16:15Z",
    "message": "failed to fetch config"
}

以下是更新程序上的 docker-compose 设置：

version: '3'
services:
  onlineconf-updater:
    build: .
    image: onlineconf-updater
    volumes:
      - ./data:/usr/local/etc/onlineconf
    environment:
      ONLINECONF_ADMIN_HOST: IP
      ONLINECONF_ADMIN_PORT: 80
      ONLINECONF_UPDATER_USER: gopher
      ONLINECONF_UPDATER_PASSWORD: gopher
    restart: always

行政：

version: '3'
services:
  onlineconf-admin:
    build: .
    image: onlineconf-admin
    depends_on:
      - onlineconf-database
    ports:
      - "80:80"
      - "443:80"
    environment:
      ONLINECONF_DATABASE_HOST: onlineconf-database
      ONLINECONF_DATABASE_BASE: onlineconf
      ONLINECONF_DATABASE_USER: onlineconf
      ONLINECONF_DATABASE_PASSWORD: onlineconf
    restart: always
  onlineconf-database:
    image: mysql:5.7
    volumes:
      - data:/var/lib/mysql
      - ./etc/charset.cnf:/etc/mysql/conf.d/charset.cnf
      - ./etc/schema.sql:/docker-entrypoint-initdb.d/1-schema.sql
      - ./etc/notification.sql:/docker-entrypoint-initdb.d/2-notification.sql
      - ./etc/auth.sql:/docker-entrypoint-initdb.d/3-auth.sql
      - ./etc/example.sql:/docker-entrypoint-initdb.d/4-example.sql
    environment:
      MYSQL_RANDOM_ROOT_PASSWORD: 1
      MYSQL_DATABASE: onlineconf
      MYSQL_USER: onlineconf
      MYSQL_PASSWORD: onlineconf
volumes:
  data: {}