amazon-web-services - AWS 云形成 : Passing Values between Nested Stacks

Question

更多 AWS 问题!好的，我们的想法是一个主模板调用所有嵌套堆栈。在此处的帮助下，我弄清楚了如何将参数从主服务器传递到嵌套堆栈。现在我试图弄清楚如何将值从嵌套堆栈传递到嵌套堆栈。我认为这应该通过导出和进口来完成，但我认为我的做法不太正确。我不确定是我的导入还是导出错误。

我收到的错误是:

No export named TestStack1-VpcStackID found. Rollback requested by user.

大师:

{
    "AWSTemplateFormatVersion" : "2010-09-09",
    "Description" : "Master template",
    "Parameters" : {
        "availabilityZone" : {
            "Default" : "us-east-1d",
            "Description" : "Enter AvailabilityZone.",
            "Type" : "String"
        },
        "VpcCidrBlock" : {
            "Default" : "10.0.0.0/16",
            "Description" : "VPC CIDR Block.",
            "Type" : "String"
        },
        "PublicSubnetCidrBlock" : {
            "Default" : "10.0.0.0/24",
            "Description" : "Public subnet CIDR block.",
            "Type" : "String"
        }
    },
    "Resources" : {
        "VpcStack" : {
            "Type" : "AWS::CloudFormation::Stack",
            "Properties" : {
                "Parameters" : {
                    "VpcCidrBlock" : {
                        "Ref" : "VpcCidrBlock"
                    }
                },
                "TemplateURL" : "https://s3.amazonaws.com/url/templates/vpcStack.json",
                "TimeoutInMinutes" : "5"
            }
        },
        "PublicRouteStack" : {
            "Type" : "AWS::CloudFormation::Stack",
            "Properties" : {
                "Parameters" : {
                    "PublicSubnetCidrBlock" : {
                        "Ref" : "PublicSubnetCidrBlock"
                    },
                    "VpcStack" : {
                        "Fn::ImportValue" : {
                            "Fn::Sub" : "${AWS::StackName}-VpcStackID"
                        }
                    }
                },
                "TemplateURL" : "https://s3.amazonaws.com/url/templates/publicRouteStack.json",
                "TimeoutInMinutes" : "5"
            }
        }
    }
}

VpcStack(嵌套 - 我认为我的输出不正确):

{
    "AWSTemplateFormatVersion" : "2010-09-09",
    "Description" : "VPC template",
    "Parameters" : {
        "VpcCidrBlock" : {
            "Description" : "Vpc CIDR Block.",
            "Type" : "String"
        }
    },
    "Resources" : {
        "VpcStack" : {
            "Type" : "AWS::EC2::VPC",
            "Properties" : {
                "EnableDnsSupport" : "true",
                "EnableDnsHostnames" : "true",
                "CidrBlock" : {
                    "Ref" : "VpcCidrBlock"
                },
                "Tags" : [
                    {
                        "Key" : "Application",
                        "Value" : {
                            "Ref" : "AWS::StackName"
                        }
                    }
                ]
            }
        }
    },
    "Outputs" : {
        "VpcStack" : {
            "Description" : "VPC Stack ID.",
            "Value" : {
                "Ref" : "VpcStack"
            },
            "Export" : {
                "Name" : {
                    "Fn::Sub" : "${AWS::StackName}-VpcStackID"
                }
            }
        }
    }
}

PublicStubnetStack(我认为这就是它失败的地方):

{
    "AWSTemplateFormatVersion" : "2010-09-09",
    "Description" : "Public Subnet Stack",
    "Parameters" : {
        "PublicSubnetCidrBlock" : {
            "Default" : "10.0.0.0/24",
            "Description" : "Public subnet CIDR block.",
            "Type" : "String"
        },
        "VpcStack" : {
            "Description" : "VPC Stack.",
            "Type" : "String"
        }
    },
    "Resources" : {
        "PublicSubnet" : {
            "Type" : "AWS::EC2::Subnet",
            "Properties" : {
                "VpcId" : {
                    "Ref" : "VpcStack"
                },
                "CidrBlock" : {
                    "Ref" : "PublicSubnetCidrBlock"
                },
                "Tags" : [
                    {
                        "Key" : "Application",
                        "Value" : {
                            "Ref" : "AWS::StackName"
                        }
                    },
                    {
                        " Key" : "Network",
                        "Value" : "Public"
                    }
                ]
            }
        }
    },
    "Outputs" : {
        "PublicSubnet" : {
            "Description" : "Public Subnet ID.",
            "Value" : {
                "Ref" : "PublicSubnet"
            },
            "Export" : {
                "Name" : {
                    "Fn::Sub" : "${AWS::StackName}-PublicSubnetID"
                }
            }
        }
    }
}

很抱歉发布了这么多，我对 AWS 非常陌生，并且正在努力快速掌握它。

Answer 1

问题

您的问题是您将值导出为

"Export" : {
  "Name" : {
    "Fn::Sub" : "${AWS::StackName}-VpcStackID"
  }
}

您正在使用 ${AWS::StackName} 变量，该变量会将当前堆栈名称替换为导出变量名称。请注意，这是嵌套堆栈的堆栈名称。

然而，在您的包装模板中，您尝试将值导入为:

"Fn::ImportValue" : {
  "Fn::Sub" : "${AWS::StackName}-VpcStackID"
}

再次，您将用变量 ${AWS::StackName} 替换当前堆栈，在本例中是您的包装器堆栈.

请注意，当您使用嵌套堆栈时，您实际上是在创建一个新堆栈，因此堆栈名称会根据您所在的模板而变化。

决议

不要对变量使用导入/导出。

在嵌套模板中，从输出中删除 Export 元素。你不需要它们。只需使用堆栈参数将值从包装器堆栈传递到嵌套堆栈，并使用堆栈输出将值从嵌套堆栈传递回包装器堆栈。

在包装器堆栈中，使用 VpcStack 的输出，如下所示:

"PublicRouteStack" : {
        "Type" : "AWS::CloudFormation::Stack",
        "Properties" : {
            "Parameters" : {
                "PublicSubnetCidrBlock" : {
                    "Ref" : "PublicSubnetCidrBlock"
                },
                "VpcStack" : {
                    "Fn::GetAtt" : [ "VpcStack", "Outputs.VpcStack" ]
                }
            },
            "TemplateURL" : "https://s3.amazonaws.com/url/templates/publicRouteStack.json",
            "TimeoutInMinutes" : "5"
        }
    }

请注意，在本例中，我通过 Fn::使用 VpcStack 嵌套堆栈中名为 VpcStack 的输出: GetAtt 函数。

PS。为了清楚起见，您应该更改一些姓名。尽量避免在各处重复使用相同的名称。它有助于让事情变得清晰。