Docker撰写和主机名 [英] Docker compose and hostname

问题描述

我有一个包含2个服务（容器）的名为 web和 db的撰写文件。

I have a compose file with 2 services (containers) named "web" and "db".

{
    "version": "2",
    "services": {
        "web": {
            "image": "nodejs:latest",
            "ports": ["80"]
        },
        "db": {
            "image": "mysql:latest",
            "ports": ["3306"]
        }
    }
}    

我能够通过使用 db作为数据库的ip从Web容器访问db容器。如下所示，在撰写文件中使用主机名有什么好处？

I am able to access db container from web container by using "db" as ip for my database. What advantage do i have by using "hostname" in the compose file as shown below?

{
    "version": "2",
    "services": {
        "web": {
            "image": "nodejs:latest",
            "hostname": "web",
            "ports": ["80"]
        },
        "db": {
            "image": "mysql:latest",
            "hostname": "db",
            "ports": ["3306"]
        }
    }
}

推荐答案

在容器之间的专用网络中自动发现主机的功能已在 docker-compose语法的版本'2'。在您只能通过容器的链接别名引用容器之前。还有其他创建发现的解决方案-例如。添加代理或大使容器。

The feature of auto discovery of hosts in private network between container has been introduced in version '2' of docker-compose syntax. Before you were only able to reference containers by their link aliases. There were other solutions to create discovery - for ex. adding a proxy or 'ambassador' containers.

话虽如此，我会看到3个使用主机名的原因：

That being said I would see 3 reasons for using hostnames:

• 发现


• 一个服务（例如Web服务器）中可以有多个主机名


• 如果要在不同环境之间保持一致的配置，则可以使用主机名来描述应用程序正在使用的其他端点，而不是依赖服务名

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