如何使用docker-compose链接两个容器 [英] How to link two containers using docker-compose

问题描述

目前，我有两个容器是根据图片构建的，然后将两个容器链接起来:

At the moment I have two containers which I build from an image and then link the two:

例如:

#mysql
docker build -t my/mysql docker-mysql
docker run -p 3306:3306 --name mysql -d my/mysql:latest

#webapp
docker build -t my/tomcat:7.0 tomcat/7.0
docker run -d --link mysql --name tomcat7 my/tomcat:7.0

由于我将 webapp 容器与 mysql 容器链接，所以 webapp 容器将获得一个 MYSQL_PORT_3306_TCP_ADDR 环境变量已创建.我使用此环境变量，然后在 jdbc 字符串中连接到mysql数据库.

Since I'm linking the webapp container with mysql container, the webapp container gets a MYSQL_PORT_3306_TCP_ADDR environment variable created. I use this environment variable to then connect to the mysql database in my jdbc string.

所有这些都可以正常工作，但是现在我想使用 docker-compose ，以便可以从一个命令构建和运行所有内容.

All of this works fine but now I'd like to use docker-compose so that everything can be built and ran from one command.

但是，在玩docker-compose时，我注意到它在图像名称前加上 docker _ 前缀，并且进一步弃用了 link 选项.

However, while playing with docker-compose I'm noticing that it prefixes docker_ to the image name and furthermore deprecates the link option.

问题

以上构建/运行命令将如何转换为docker-compose yml文件，以便webapp容器可以连接到jdbc的mysql容器.

How would the above build/run commands translate to docker-compose yml file such that the webapp container can connect to the mysql container for jdbc.

推荐答案

这里是对docker-compose的粗略翻译.

Here is a rough translation to a docker-compose.

请注意，docker-compose将其标记为自己的图像，因此，假设您在名为 test 的目录中创建了一个 mysql 图像，则容器名称将变为test_mysql_1 .1附加在末尾，因为您可以使用docker-compose扩展多个容器.

Note that docker-compose tags it's own images, so say you made a mysql image in a directory named test, then the container name would turn into test_mysql_1. The 1 is appended on the end because you can scale up multiple containers using docker-compose.

此文件也采用此文件结构

This file also assumes this file-structure

├── docker-mysql
│   └── Dockerfile
├── tomcat
│   └── 7.0
│       └── Dockerfile
└── docker-compose.yml

---

version: '2'
services:
    mysql:
        build:
            context: "./docker-mysql"
        hostname: mysql
        ports:
            - "3306:3306"
    webapp:
        build:
            context: "./tomcat/7.0"
        hostname: tomcat7
        links:
            - mysql

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