云形成资源创建中的多个条件 [英] Multiple conditions in cloud formation resource creation

问题描述

我正在使用平台条件来控制在AWS上启动的环境类型。有很多共享资源，但是我需要某些EC2实例，这些实例具有预先烘焙的AMI，具体取决于许多条件。

I'm using a platform condition to control the type of environment that gets spun up on AWS. There are plenty of shared resources, but I need certain EC2 instances with pre-baked AMIs depending on a number conditions.

"Parameters": {
"Platform": {
  "Description": "Select platform type - linux or windows",
  "Default": "linux",
  "Type": "String",
  "AllowedValues": [ "linux", "windows", "both" ],
  "ConstraintDescription": "Must enter either linux, windows, or both"
},

然后设置条件。

"Conditions" : {
  "LinuxPlatform" : {"Fn::Equals" : [{"Ref" : "Platform"}, "linux"]},
  "WindowsPlatform" : {"Fn::Equals" : [{"Ref" : "Platform"}, "windows"]},
  "BothPlatform" : {"Fn::Equals" : [{"Ref" : "Platform"}, "both"]}
},

在资源中，我想使用linux或windows来触发Windows或Linux Ec2的创建，或者同时使用这两者来部署声明的每个ec2资源。

In a resource I'd like to use either linux or windows to trigger a Windows or Linux Ec2 creation, or use both to deploy every ec2 resource declared.

我e通过几种方式使用 fn：or 进行了以下尝试。

I've tried the following using fn:or in a few ways.

Fn： ：Or：[{ Condition： LinuxPlatform}，{ Condition： BothPlatform}]，

和。 ..

"Condition" : {
   "Fn::Or" : [
      {"Condition" : "LinuxPlatform"},
      {"Condition" : "BothPlatform"}
   ]
}

尝试使用aws cli进行部署和验证时，我不断收到以下错误。

I keep getting the following error when trying to deploying and validating using the aws cli.

aws cloudformation validate-template --template-body       file://./cloudformation/deploy.json

A client error (ValidationError) occurred when calling the ValidateTemplate operation: Template format error: Every Condition member must be a string.

是否可以评估多个条件来控制资源创建？如果没有其他选择，我可以尝试吗？

Is it possible to evaluate multiple conditions to control resource creation? If not are there any alternatives I could try?

推荐答案

尝试添加

"MyCondition": {"Fn::Or": [{"Condition": "LinuxPlatform"}, {"Condition": "BothPlatform" }]}

到条件的底部，像这样：

    "Conditions" : {
        "LinuxPlatform" : {"Fn::Equals" : [{"Ref" : "Platform"}, "linux"]},
        "WindowsPlatform" : {"Fn::Equals" : [{"Ref" : "Platform"}, "windows"]},
        "BothPlatform" : {"Fn::Equals" : [{"Ref" : "Platform"}, "both"]},
        "MyCondition": {"Fn::Or": [{"Condition": "LinuxPlatform"}, {"Condition": "BothPlatform" }]}
    },

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