Question

我的嵌套堆栈需要位于主堆栈中的资源。例如：嵌套堆栈中的lambda函数需要DB配置

   "ProjectsusgetProjectFinancialsLF": {
            "Type": "AWS::Lambda::Function",
            "Properties": {
                "Code": {
                    "S3Bucket": "dev",
                    "S3Key": "test-lamda.zip",
                    "S3ObjectVersion": "9eNYbcI5EOuuut9igX2xpgbGCtKD1D4K"
                },
                "Environment": {
                    "Variables": {
                        "MYSQLDB_USER": {
                            "Ref": "DBuser"
                        },
                        "MYSQLDB_HOST": {
                            "Fn::GetAtt": [
                                "testDB",
                                "Endpoint.Address"
                            ]
                        },
                        "MYSQLDB_DATABASE": {
                            "Ref": "DBname"
                        },
                        "MYSQLDB_PASSWORD": {
                            "Ref": "DBpass"
                        }
                    }
                },
                "Description": "A get project financials function",
                "FunctionName": {
                    "Fn::Join": [
                        "-",
                        [
                            {
                                "Ref": "EnvType"
                            },
                            "getProjectFinancials"
                        ]
                    ]
                },
                "Handler": "src/controllers/projects.geFinancials",
                "Role": {
                    "Fn::GetAtt": [
                        "LambdaExecutionRole",
                        "Arn"
                    ]
                },
                "Runtime": "nodejs6.10"
            },
            "DependsOn": [
                "LambdaExecutionRole"
            ]
        },

所以我将所需的参数从我的主堆栈传递给嵌套的使用参数：

"FinancialStack": {
    "Type": "AWS::CloudFormation::Stack",
    "Properties": {
        "TemplateURL": "https://s3.amazonaws.com/dev/child-cft.json",
        "TimeoutInMinutes": "5",
        "Parameters": {
            "DBuser": {
                "Ref": "DBuser",
                "Type": "String"
            },
            "epmoliteDB": {
                "Ref": "testDB",
                "Type": "AWS::RDS::DBInstance"
            },
            "DBname": {
                "Ref": "DBname",
                "Type": "String"
            },
            "DBPass": {
                "Ref": "DBpass",
                "Type": "String"
            },
            "EnvType": {
                "Ref": "EnvType",
                "Type": "String"
            },
            "LambdaExecutionRole": {
                "Ref": "LambdaExecutionRole",
                "Type": "AWS::IAM::Role"
            },
            "ApiGatewayRestApi": {
                "Ref": "ApiGatewayRestApi",
                "Type": "AWS::ApiGateway::RestApi"
            }
        }
    }
}

这就是我在嵌套堆栈中接收它们的方式：

{
    "AWSTemplateFormatVersion": "2010-09-09",
    "Description": "AWS CloudFormation to generate testone shot deployment",
    "Parameters": {
        "DBuser": {
            "Ref": "DBuser",
            "Type": "String"
        },
        "epmoliteDB": {
            "Ref": "testDB",
            "Type": "AWS::RDS::DBInstance"
        },
        "DBname": {
            "Ref": "DBname",
            "Type": "String"
        },
        "DBPass": {
            "Ref": "DBpass",
            "Type": "String"
        },
        "EnvType": {
            "Ref": "EnvType",
            "Type": "String"
        },
        "LambdaExecutionRole": {
            "Ref": "LambdaExecutionRole",
            "Type": "AWS::IAM::Role"
        },
        "ApiGatewayRestApi": {
            "Ref": "ApiGatewayRestApi",
            "Type": "AWS::ApiGateway::RestApi"
        }
    },

然而，当我运行cloudformation脚本时，它无法创建嵌套堆栈。我是否将资源从主堆栈错误地传递到嵌套堆栈？

我应该在主堆栈的输出中导出参数并使用“Fn：ImportValue”将它们导入嵌套堆栈中吗？

Answer 1

阻止这些模板发挥作用的因素有很多。

让我们从嵌套的堆栈模板开始。您不能在输入参数中使用"Ref"内在函数。只是类型就够了。此外，并非所有内容都支持作为参数类型（here's the list），例如，"Type": "AWS::ApiGateway::RestApi"不是有效的参数类型。如果不直接支持某些内容，请使用"String"类型。事实上，对于嵌套堆栈，您可以使您的生活更轻松，只需使用"String"类型。

下一步要修复的是AWS::CloudFormation::Stack资源块。在这里，您为每个传递的"Type"使用了"Parameters"属性，但实际上您无法在那里指定类型。嵌套模板的工作是指定它期望的输入类型。

我强烈建议您花点时间阅读CloudFormation documentation。更好的是，阅读AWS制作的一些示例。 Here's a good example of nested stacks，请看看master.yaml。

如何在嵌套的cloudformation中将资源从父堆栈传递到子堆栈？

1 个答案: