Explanation:
In AWS CloudFormation, the DependsOn attribute allows you to explicitly define a dependency between resources. By adding a DependsOn attribute to the custom resource and pointing it to the EC2 instance, CloudFormation will guarantee that the EC2 instance is fully launched and running before it triggers the Lambda custom resource.
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A company has created an AWS CloudFormation template that consists of the AWS::EC2::Instance resource and a custom CloudFormation resource. The custom CloudFormation resource is an AWS Lambda function that attempts to run automation on the Amazon EC2 instance.
During testing, the Lambda function fails because the Lambda function tries to run before the EC2 instance is launched.
Which solution will resolve this issue?
A
Add a DependsOn attribute to the custom resource. Specify the EC2 instance in the DependsOn attribute.
B
Update the custom resource's service token to point to a valid Lambda function.
C
Update the Lambda function to use the cfn-response module to send a response to the custom resource.
D
Use the Fn::If intrinsic function to check for the EC2 instance before the custom resource runs.
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