Amazon
SOA-C03 · Question #19
A company has an AWS CloudFormation template that includes an AWS::EC2::Instance resource and a custom resource (Lambda function). The Lambda function fails because it runs before the EC2 instance is
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Submitted by rania.sa· Mar 5, 2026Deployment, provisioning, and automation
Question
A company has an AWS CloudFormation template that includes an AWS::EC2::Instance resource and a custom resource (Lambda function). The Lambda function fails because it runs before the EC2 instance is launched. Which solution will resolve this issue?
Options
- AAdd a DependsOn attribute to the custom resource. Specify the EC2 instance in the DependsOn
- BUpdate the custom resource's service token to point to a valid Lambda function.
- CUpdate the Lambda function to use the cfn-response module to send a response to the custom
- DUse the Fn::If intrinsic function to check for the EC2 instance before the custom resource runs.
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Topics
#CloudFormation DependsOn#custom resource#resource ordering#Lambda