amazon-web-services - CloudFormation SQS 队列重新驱动策略依赖于创建的 DLQ

Question

我正在使用 CloudFormation 模板为 SQS 创建堆栈。我有一个 SQS 队列集，它依赖于另一个用作 DLQ 的 SQS 队列。当我创建堆栈时，出现此错误:

Value {"deadLetterTargetArn":"arn:aws:sqs:eu-west-1:xxxxxxxxx:services-abc-dlq","maxReceiveCount":"10"} for parameter RedrivePolicy is invalid. Reason: Dead letter target does not exist.

如何设置重新驱动策略以等待 DLQ 创建完成？

以下是我的模板中的相关信息:

"Resources": {
    "queueservicesdlqevents": {
      "Type": "AWS::SQS::Queue",
      "Properties": {
        "DelaySeconds": "0",
        "MaximumMessageSize": "262144",
        "MessageRetentionPeriod": "345600",
        "QueueName": "services-abc-dlq",
        "ReceiveMessageWaitTimeSeconds": "0",
        "VisibilityTimeout": "30"
      }
    },
    "queueservicesevents": {
      "Type": "AWS::SQS::Queue",
      "Properties": {
        "DelaySeconds": "0",
        "MaximumMessageSize": "262144",
        "MessageRetentionPeriod": "345600",
        "QueueName": "services-abc-events",
        "ReceiveMessageWaitTimeSeconds": "20",
        "VisibilityTimeout": "30",
        "RedrivePolicy": {
          "deadLetterTargetArn" : "arn:aws:sqs:eu-west-1:xxxxxx:services-abc-dlq",
          "maxReceiveCount" : 10
        }
      }
    },

只是补充一下，为其他队列创建“Ref”不起作用，因为 dlqtargetArn 需要一个字符串。

Answer 1

Just to add, making a "Ref" to other queue doesn't work because dlqtargetArn expects a string.

Ref仅提供 AWS CloudFormation 的(默认)值资源，但可以通过Fn::GetAtt获取资源的其他属性值如下:

"Fn::GetAtt" : [ "logicalNameOfResource", "attributeName" ]

也就是说，按照AWS::SQS::Queue内的返回值部分，手头的死信队列的 ARN 可通过以下方式获得:

"Fn::GetAtt" : [ "queueservicesdlqevents", "Arn" ]

一旦您从依赖资源引用实际 ARN，CloudFormation 将确保首先创建依赖项，以便在您创建 queueservicesevents 时死信目标 queueservicesdlqevents 已存在> 队列。