Chef：如何检查是否已安装服务？ [英] Chef: How do I check to see if a service is installed?

问题描述

在食谱中，我想检查是否已安装服务，以及是否未通知安装该服务所需的3种资源。我尝试了服务资源，该资源可以在安装时正确识别该服务，但是如果未安装该服务，则会引发异常。

In a recipe I want to check to see if a service is installed, and if it is not notify the 3 resources needed to install it. I tried the service resource, which correctly identifies the service when it is installed, but throws an exception if the service is not installed.

我不确定在此使用什么操作。 ：什么都不会跳过资源，因此它永远不会被执行，但是当其他任何操作试图对不存在的服务执行操作时，它们都会出错。

I'm not sure what action to use here. :nothing just skips the resource so it ever get executed, but any of the other actions will error when they attempt to act on a service that doesn't exist.

如何

如果相关，我正在Windows上运行。

I'm running on Windows, if that's relevant.

推荐答案

看看如何定义Windows服务

Take a look on how is service for windows is defined

https://github.com/opscode/chef/blob/master/lib/chef/provider/service/ windows.rb

AFAIU非常简单地将导入内容添加到您的食谱中：

AFAIU its pretty straighforward add import to your recipe:

require 'win32/service'

，然后可以检查服务是否存在

and then you can check if service exists with

Win32::Service.exists?(@new_resource.service_name)

瞧-您可以在库中添加拼写（http://docs.opscode.com/essentials_cookbook_libraries.html ）只是不污染配方代码，而
具有简单的service_exists方法。

voila - you can put impementation to library (http://docs.opscode.com/essentials_cookbook_libraries.html) just not to pollute recipe code and have simple method service_exists?.

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