Which solution will resolve this issue?
Add a DependsOn attribute to the custom resource. Specify the EC2 instance in the DependsOn attribute.
Update the custom resource’s service token to point to a valid Lambda function.
Update the Lambda function to use the cfn-response module to send a response to the custom resource.
Use the Fn::If intrinsic function to check for the EC2 instance before the custom resource runs.
Explanations:
Adding aDependsOnattribute to the custom resource ensures that the EC2 instance is launched before the Lambda function executes.
Updating the service token is unrelated to resolving the timing issue between the Lambda function and EC2 instance.
Thecfn-responsemodule handles responses for custom resources but does not affect resource dependency or execution order.
Fn::Ifonly handles conditional logic and does not enforce or manage dependency ordering between resources.
I figure that the answer is:
Add a DependsOn attribute to the custom resource. Specify the EC2 instance in the DependsOn attribute.