我正在尝试使用一个docker容器来处理mariadb和node.js图像。容器将使用/home/mysql中现有的数据库。然而，当容器启动时，我在node.js中得到了这个“连接失败”错误：

Error: ER_HOST_NOT_PRIVILEGED: 
Host '172.18.0.5' is not allowed to connect to this MariaDB server

下面是我的docker-compose.yml：

version: '3'
services:
  mariadb:
    image: mariadb
    restart: always
    volumes:
     - /home/mysql:/var/lib/mysql
    user: "mysql"
    ports:
      - "3306:3306"
  watch:
    build: .
    restart: always
    links:
      - mariadb:mysql
    environment:
      - DOCKER_IP=172.18.0.2
    depends_on: ['mariadb']
    ports:
      - "3000:3000"

在阅读了这篇thread之后，我发现mysql实际上是在运行的，但它无法让其他服务连接：
这是我检查过的一些步骤。如你所见，我可以登录到mysql示例：

$ docker exec -it 552aae9ea09c bash

    mysql@552aae9ea09c:/$ mysql -u root -p
    Enter password: *******

    MariaDB [(none)]> SELECT host, user FROM mysql.user;
    +-------------+------------------+
    | host        | user             |
    +-------------+------------------+
    | 127.0.0.1   | root             |
    | ::1         | root             |
    | someusername|                  |
    | someusername| root             |
    | localhost   |                  |
    | localhost   | dbusername       |
    | localhost   | databasename     |
    | localhost   | root             |
    +-------------+------------------+
    8 rows in set (0.00 sec)

mysql@552aae9ea09c:/$ mysqld --verbose --help | grep bind-address

2017-11-13 17:35:40 139825857279872 [Note] Plugin 'FEEDBACK' is disabled.
  --bind-address=name IP address to bind to.

bind-address                                       (No default value)

需要注意的一点是，即使我在yml文件中显式地将user设置为mysql，/home/mysql中的这三个文件：ib_logfile0，ib_logfile1，ib_buffer_pool仍然在systemd-journal-remote的组下，我怀疑这与连接失败有关。（reference）