amazon-web-services - AWS Cloudformation如何使用条件资源作为其他资源的 DependsOn

Question

我正在尝试使用 IAMInstanceprofile 的可选值创建 EC2 实例。当 createiam 为 False 时，我期望 ec2stack 在没有 iam 的情况下创建，当其为 True 时，它​​应该等待 iamstack 并使用其值。

     "Parameters": {
        "createiam" : {
            "Type" : "String",
            "Default" : "False"
        }
     },

     "Conditions" : {
           "Create_iam" : {"Fn::Equals" : [{"Ref" : "createiam"}, "True"]}
       },

    "Resources" : {
        "iamstack" : {
            "Type" : "AWS::CloudFormation::Stack",
            "Condition": "Create_iam"
        },
        "ec2stack": {
            "Type" : "AWS::CloudFormation::Stack",
            "DependsOn" : "iamstack"
         }
      }

在使用 crateiam 选项 False 运行堆栈时，出现错误，提示未找到 iamstack 资源。有没有办法为 Dependson 值添加条件？

Answer 1

我可以通过 WaitConditionHandle 来实现这一点。

在这里找到引用资料。

1. Stack overflow question
2. Blog link with explination

现在的代码流程:

"Parameters": {
        "createiam" : {
            "Type" : "String",
            "Default" : "False"
        }
     },

"Conditions" : {
           "Create_iam" : {"Fn::Equals" : [{"Ref" : "createiam"}, "True"]}
       },
       
"Resources" : {
    "IAMWaithandle": {
        "Condition": "Create_iam",
        "DependsOn": "iamstack",
        "Type": "AWS::CloudFormation::WaitConditionHandle"
    },
    "WaitHandle": {
        "Type": "AWS::CloudFormation::WaitConditionHandle"
    },
    "IAMWaitcondiftion": {
        "Type": "AWS::CloudFormation::WaitCondition",
        "Properties": {
            "Handle": {
                "Fn::If": [
                    "Create_iam",
                    {
                        "Ref": "IAMWaithandle"
                    },
                    {
                        "Ref": "WaitHandle"
                    }
                ]
            },
            "Timeout": "1",
            "Count": 0
        }
    },
    "iamstack" : {
        "Type" : "AWS::CloudFormation::Stack",
        "Condition": "Create_iam"
    },
    "ec2stack": {
        "Type" : "AWS::CloudFormation::Stack",
        "DependsOn" : "IAMWaitcondiftion"
     }
    }