为什么phpmyadmin和mysql docker容器之间的连接不起作用

Question

我正在尝试将 phpmyadmin-container 连接到 mysql-container 以查看数据库。 phpmyadmin web 界面返回错误Cannot log in to the MySQL server 和mysqli_real_connect(): (HY000/2002): No route to host。 我究竟做错了什么？谢谢。

我使用这个操作：

1. docker-compose down && docker-compose up -d
2. 在网络浏览器中输入http://localhost:8080
3. 我用用户root登录，密码test
4. 获取上述错误

我的 docker-compose.yml

version: '2'
services:
  db:
    image: mysql
    environment:
      MYSQL_ROOT_PASSWORD: test
    ports:
      - "3306:3306"
  phpmyadmin:
    image: phpmyadmin/phpmyadmin
    links:
      - db
    ports:
      - "8080:80"

Answer 1

见official guide:

您需要指定一些环境才能链接到外部 mysql 容器：

环境变量汇总

PMA_ARBITRARY - when set to 1 connection to the arbitrary server will be allowed
PMA_HOST - define address/host name of the MySQL server
PMA_VERBOSE - define verbose name of the MySQL server
PMA_PORT - define port of the MySQL server
PMA_HOSTS - define comma separated list of address/host names of the MySQL servers
PMA_VERBOSES - define comma separated list of verbose names of the MySQL servers
PMA_PORTS - define comma separated list of ports of the MySQL servers
PMA_USER and PMA_PASSWORD - define username to use for config authentication method
PMA_ABSOLUTE_URI - define user-facing URI

对你来说，mysql名字是db，所以你需要做next：

version: '2'
services:
  db:
    image: mysql
    environment:
      MYSQL_ROOT_PASSWORD: test
    ports:
      - "3306:3306"
    command: --default-authentication-plugin=mysql_native_password
  phpmyadmin:
    image: phpmyadmin/phpmyadmin
    ports:
      - "8080:80"
    environment:
      PMA_HOSTS: db

另外，--link 已弃用，删除即可，docker-compose 会自动为您设置网络，让容器在 dns 帮助下互相看到。