如何通过CloudFormation设置AWS对等连接DNS解析选项？

Question

我有两个VPC：

• 包含我们的RDS实例的VPC1。
• VPC2，其中包含我们的EC2实例集群。

We have successfully setup a VPC peering connection, routes and security groups to allow appropriate communication.

In order to resolve the RDS instance AZ-appropriate local IP address from it's hostname, we need to follow these instructions and set --requester-peering-connection-options AllowDnsResolutionFromRemoteVpc=true.

If I do this manually through the AWS Console or the AWS CLI it all works fine, however I'm creating the cluster of EC2 instances through CloudFormation and the option is missing from the CloudFormation documentation.

The effect of this is that my stack starts up and fails because the services themselves cannot connect to the database.

Am I doing something obvious wrong, or is this just Amazon being incomplete?

Thanks!

Answer 1

由于更新频率较高，很多时候 CloudFormation 中不提供 AWS 功能（以前是针对 Lambda 的 ALB） - 您最终必须创建自定义资源来管理它。这还不算太糟糕，只需确保您的 lambda 在所有情况下（包括异常）都能成功或失败地响应，否则您的堆栈将“进行中”几个小时。