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我有以下的CloudFormation模板。 （這是默認的基於關閉在AWS運行LAMBDA C＃的Web API創建的模板，但可能不相關。）CloudFormation：創建資源，如果他們不存在，但不刪除它們
它創建了一個AWS lambda函數。如果現有資源的名稱不作爲參數提供，模板還會創建IAM角色和DynamoDB表。
那部分工作。如果沒有爲角色和表提供名稱，則會創建它們。
當我第二次運行模板執行更新時存在問題：此時，我的角色和表已存在，因此我提供了名稱作爲參數。但是，當CloudFormation第二次運行時，首次創建的資源（角色和表）將被刪除。
是否有某種方法可以設置模板，使其在不存在的情況下創建新資源，但是如果它們已經存在則不會將其刪除？
我沒有做很多與CloudFormation，但我沒去，可通過文檔。我發現的最接近是setting a stack policy，但它似乎並沒有成爲模板的一部分。看起來事實之後，我必須在管理控制檯中執行此操作。
{
"AWSTemplateFormatVersion" : "2010-09-09",
"Transform" : "AWS::Serverless-2016-10-31",
"Description" : "...",
"Parameters" : {
"ShouldCreateTable" : {
"Type" : "String",
"AllowedValues" : ["true", "false"],
"Description" : "If true then the underlying DynamoDB table will be created with the CloudFormation stack."
},
"TableName" : {
"Type" : "String",
"Description" : "Name of DynamoDB table to be used for underlying data store. If left blank a new table will be created.",
"MinLength" : "0"
},
"ShouldCreateRole" : {
"Type" : "String",
"AllowedValues" : ["true", "false"],
"Description" : "If true then the role for the Lambda function will be created with the CloudFormation stack."
},
"RoleARN" : {
"Type" : "String",
"Description" : "ARN of the IAM Role used to run the Lambda function. If left blank a new role will be created.",
"MinLength" : "0"
}
},
"Conditions" : {
"CreateDynamoTable" : {"Fn::Equals" : [{"Ref" : "ShouldCreateTable"}, "true"]},
"TableNameGenerated" : {"Fn::Equals" : [{"Ref" : "TableName"}, ""]},
"CreateRole":{"Fn::Equals" : [{"Ref" : "ShouldCreateRole"}, "true"]},
"RoleGenerated" : {"Fn::Equals" : [{"Ref" : "RoleARN"}, ""]}
},
"Resources" : {
"Get" : {
"Type" : "AWS::Serverless::Function",
"Properties": {
...
"Role": {"Fn::If" : ["CreateRole", {"Fn::GetAtt":["LambdaRole", "Arn"]}, {"Ref":"RoleARN"}]},
"Environment" : {
"Variables" : {
"AppDynamoTable" : { "Fn::If" : ["CreateDynamoTable", {"Ref":"DynamoTable"}, { "Ref" : "TableName" } ] }
}
},
...
}
},
"LambdaRole":{
"Type":"AWS::IAM::Role",
"Condition":"CreateRole",
"Properties":{
"ManagedPolicyArns":["arn:aws:iam::aws:policy/AWSLambdaFullAccess"],
"AssumeRolePolicyDocument": {
"Version" : "2012-10-17",
"Statement": [ {
"Effect": "Allow",
"Principal": {
"Service": [ "lambda.amazonaws.com" ]
},
"Action": [ "sts:AssumeRole" ]
} ]
},
"Policies": [ {
"PolicyName": "root",
"PolicyDocument": {
"Version": "2012-10-17",
"Statement": [
{
"Effect": "Allow",
"Action": [
"dynamodb:Query",
"dynamodb:Scan",
"dynamodb:PutItem",
"dynamodb:GetItem",
"dynamodb:UpdateItem",
"dynamodb:DeleteItem",
"logs:CreateLogGroup",
"logs:CreateLogStream",
"logs:PutLogEvents"
],
"Resource": [
"*"
]
}
]
}
}
]
}
},
"DynamoTable" : {
"Type" : "AWS::DynamoDB::Table",
"Condition" : "CreateDynamoTable",
"Properties" : {
"TableName" : { "Fn::If" : ["TableNameGenerated", {"Ref" : "AWS::NoValue" }, { "Ref" : "TableName" } ] },
"AttributeDefinitions": [
{ "AttributeName" : "id", "AttributeType" : "S" }
],
"KeySchema" : [
{ "AttributeName" : "id", "KeyType" : "HASH"}
],
"ProvisionedThroughput" : { "ReadCapacityUnits" : "5", "WriteCapacityUnits" : "5" }
}
}
},
"Outputs" : {
"UnderlyingDynamoTable" : {
"Value" : { "Fn::If" : ["CreateDynamoTable", {"Ref":"DynamoTable"}, { "Ref" : "TableName" } ] }
},
"LambdaRole" : {
"Value" : {"Fn::If" : ["CreateRole", {"Fn::GetAtt":["LambdaRole", "Arn"]}, {"Ref":"RoleARN"} ] }
}
}
}
我可以刪除創建步驟和API網關之前手動創建資源，但它似乎像什麼，我要做的應該是可能的。