AWS Certified SysOps Administrator – Associate (legacy) — Question 77

While creating the wait condition resource in AWS CloudFormation, a SysOps Administrator receives the error `received 0 signals out of the 1 expected from the
EC2 instance`.
What steps should be taken to troubleshoot this issue? (Choose two.)

Answer options

• A. Confirm from the cfn logs that the cfn-signal command was successfully run on the instance.
• B. Try to re-create the stack with a different IAM user.
• C. Check that the instance has a route to the Internet through a NAT device.
• D. Update the AWS CloudFormation stack service role to have iam:PassRole permission.
• E. Delete the existing stack and attempt to create a new once.

Correct answer: A, C

Explanation

Option A is correct because checking the cfn logs will confirm if the cfn-signal command was executed, which is crucial for the wait condition to receive signals. Option C is also correct, as the instance needs Internet access to communicate back to CloudFormation. The other options do not address the specific issue of signal reception and are not relevant to troubleshooting this error.