docker-compose +外部容器 [英] docker-compose + external container

问题描述

我已经使用以下命令启动了一个Docker容器

I have started a docker container with the following command

docker run --name mysql --restart always -p 3306:3306 -v /var/lib/mysql:/var/lib/mysql -e MYSQL_ROOT_PASSWORD=password -d mysql:5.7.14

，然后想将wordpress网站与以下docker-compose.yml文件

and then would like to connect a wordpress site with the following docker-compose.yml file

version: '2'

services:
    wordpress:
        image: wordpress
        external_links:
            - mysql:mysql
        ports:
            - 80:80
    environment:
        WORDPRESS_DB_USER: root
        WORDPRESS_DB_PASSWORD: password
    volumes:
        - /var/www/somesite.com:/var/www/html

但是我不断收到以下错误消息

But I keep getting the following error

Starting somesitecom_wordpress_1
Attaching to somesitecom_wordpress_1
wordpress_1  | 
wordpress_1  | Warning: mysqli::mysqli(): (HY000/2002): Connection refused in - on line 19
wordpress_1  | 
wordpress_1  | MySQL Connection Error: (2002) Connection refused

external_links 似乎无效.

知道我在做什么错吗?

推荐答案

您的链接有效，但是您在Docker内部的不同网络上.从 docker-compose.yml文档:

Your link is working, but you're on separate networks inside of Docker. From the docker-compose.yml docs:

注意:如果您使用的是版本2文件格式，则外部创建的容器必须至少连接到与其链接的服务相同的网络之一.

Note: If you’re using the version 2 file format, the externally-created containers must be connected to at least one of the same networks as the service which is linking to them.

要解决此问题，您可以创建自己的网络:

To solve this, you can create your own network:

docker network create dbnet
docker network connect dbnet mysql

然后使用以下命令配置您的docker-compose.yml:

Then configure your docker-compose.yml with:

version: '2'

networks:
  dbnet:
    external:
      name: dbnet

services:
    wordpress:
        image: wordpress
        ports:
            - 80:80
        environment:
            WORDPRESS_DB_USER: root
            WORDPRESS_DB_PASSWORD: password
        volumes:
            - /var/www/somesite.com:/var/www/html
        networks:
          - dbnet

请注意，对于最新版本的Docker，您不需要链接容器，DNS服务应为您进行名称解析.

Note with recent versions of Docker, you shouldn't need to link the containers, the DNS service should do the name resolution for you.

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