如何确定目录中的任何文件是否已更改 [英] How to determine if any file in a directory has changed

问题描述

Chef是否可以确定它是否更改了给定目录中的任何文件？如果要更新conf.d目录中的任何设置，我想重新启动服务器进程。

Is there a way for Chef to determine if it has changed any file in a given directory? I'd like to restart a server process if any settings in a conf.d directory are updated.

我确定可以将md5sums列表写入到在每次厨师客户运行中保存文件，并将当前结果与以前的迭代进行比较。但这是解决似乎是常见情况的大量代码。有更好的方法吗？

I'm sure it's possible to write a list of md5sums to a file on each chef-client run, and compare current to previous iterations. But that's a fair bit of code to address what seems to be a common scenario. Is there a better way?

推荐答案

厨师提供了一个称为通知。

这可让您定义一个资源的更改触发另一资源的执行。提到的在配置文件更改后重启服务可能是最常见的用例。

This allows you to define that a change in one resource triggers execution of another resource. The mentioned restart of a service after the config file changed is probably the most common use case.

template "/etc/foo/conf.d/example.conf" do
    notifies :restart, "service[foo]"
end

service "foo" do
    supports :restart => true, :reload => true
    action :enable
end

默认情况下，通知为：delayed ，这意味着它们在Chef运行结束时被触发。这可以帮助您避免例如为每个更改的配置文件重新启动一次的服务。如果要立即通知，请使用

By default, notifications are :delayed, which means that they are triggered at the end of the Chef run. This helps you to avoid e.g. a service to restart once for every single changed configuration file. If you want an immediate notification, use

notifies :restart, "service[foo]", :immediately

当然，您不仅可以将Chef的通知用于服务，还可以用于任何资源。 文档中给出了更多示例。

Of course, you can use Chef's notifications not only for services, but for any resource. More examples are given in the documentation.

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