Docker 在 Azure 中撰写：无法连接到数据库

Question

我正在尝试让 SteVe OCPP server 在 Azure 容器实例中运行。但在 Azure ACI 上下文中运行 docker-compose up 时，Web 应用程序不会连接到数据库。它在本地运行得很好。

这是 docker compose 文件：

version: "3.0"

volumes:
  db-data:
    external: false

services:
  db:
    image: mariadb:10.4
    ports:
      - 3306:3306
    environment:
      MYSQL_RANDOM_ROOT_PASSWORD: "yes"
      MYSQL_DATABASE: stevedb
      MYSQL_USER: steve
      MYSQL_PASSWORD: changeme
  web:
    image: rainmakers/steve:latest
    links:
      - "db:mariadb"
    ports:
      - 8180:8180
      - 8443:8443
    depends_on:
      - db

这是我在网络服务日志中得到的唯一内容：

2021/11/23 13:20:57 Waiting for: tcp://mariadb:3306
2021/11/23 13:20:57 Problem with dial: dial tcp: lookup mariadb on 168.63.129.16:53: no such host. Sleeping 1s
2021/11/23 13:20:58 Problem with dial: dial tcp: lookup mariadb on 168.63.129.16:53: no such host. Sleeping 1s
2021/11/23 13:20:59 Problem with dial: dial tcp: lookup mariadb on 168.63.129.16:53: no such host. Sleeping 1s
2021/11/23 13:21:00 Problem with dial: dial tcp: lookup mariadb on 168.63.129.16:53: no such host. Sleeping 1s
2021/11/23 13:21:01 Problem with dial: dial tcp: lookup mariadb on 168.63.129.16:53: no such host. Sleeping 1s
2021/11/23 13:21:02 Problem with dial: dial tcp: lookup mariadb on 168.63.129.16:53: no such host. Sleeping 1s
2021/11/23 13:21:03 Problem with dial: dial tcp: lookup mariadb on 168.63.129.16:53: no such host. Sleeping 1s

这会持续一分钟，然后服务终止。

知道如何在这里进行吗？

Answer 1

我猜你应该联系http://db:3306 而不是mariadb:3306。

默认Docker Compose版本3使用服务名作为inter-container networking的主机名。