什么是本地主机，它在哪里定义? [英] What is localhost and where is it defined?

问题描述

我刚刚在 Heroku 的推荐下从 thin 更改为 puma.当我使用 puma 服务器启动我的 rails 应用程序时，它会响应:<代码>=>启动 Puma=>Rails 4.2.2 应用程序开始在 http://localhost:3000 上开发=>运行 `rails server -h` 以获得更多启动选项=>Ctrl-C 关闭服务器Puma 2.11.3 首发...* 最小线程数:0，最大线程数:16* 环境:开发* 监听 tcp://localhost:3000但是，如果我在浏览器中访问 http://0.0.0.0:3000，这是我使用瘦服务器的旧本地主机，它不会响应.但是，如果我打开 http://localhost:3000，则它可以工作.看来localhost的定义变了.

I just changed from thin to puma at the recommendation of Heroku. When I start my rails app using the puma server it responds: => Booting Puma => Rails 4.2.2 application starting in development on http://localhost:3000 => Run `rails server -h` for more startup options => Ctrl-C to shutdown server Puma 2.11.3 starting... * Min threads: 0, max threads: 16 * Environment: development * Listening on tcp://localhost:3000 However if I go to http://0.0.0.0:3000 in the browser, which was my old localhost with the thin server, it does not respond. However, if I open http://localhost:3000, then it works. It appears that the definition of localhost has changed.

那么，localhost 是什么?特别是，它是什么类型的对象，它是如何定义的，我如何看到实际的ip地址，以及为什么puma会改变它?

So, what is localhost? In particular, what sort of object is it, how is it defined, how do I see the actual ip address, and why does puma change it?

推荐答案

如果你想让 Rails 绑定到不同的 ip，方法是使用 -b 选项.要将其绑定到 0.0.0.0 而不是 Rails-default localhost，您需要按照 rails s -b 0.0.0.0

If you're trying to get Rails to bind to a different ip, the way to do that is with the -b option. To bind it to 0.0.0.0 instead of the Rails-default localhost you'd want to run something along the lines of rails s -b 0.0.0.0

注意:明确地说，将 -p 3000 选项也放入其中(设置端口)可能不是一个坏主意，即使该默认值不太可能改变.也可以通过运行 rails s -h 找到有关可用选项的更多信息.

Note: To be explicit, it may not be a bad idea to throw the -p 3000 option in there too (sets the port), even though that default is not likely to change. More info on the available options can be found by running rails s -h as well.

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