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Exam AWS Certified DevOps Engineer - Professional DOP-C02 All Questions

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Exam AWS Certified DevOps Engineer - Professional DOP-C02 topic 1 question 112 discussion

Exam question from Amazon's AWS Certified DevOps Engineer - Professional DOP-C02
Question #: 112
Topic #: 1
[All AWS Certified DevOps Engineer - Professional DOP-C02 Questions]

A DevOps engineer has implemented a CI/CD pipeline to deploy an AWS CloudFormation template that provisions a web application. The web application consists of an Application Load Balancer (ALB), a target group, a launch template that uses an Amazon Linux 2 AMI, an Auto Scaling group of Amazon EC2 instances, a security group, and an Amazon RDS for MySQL database. The launch template includes user data that specifies a script to install and start the application.

The initial deployment of the application was successful. The DevOps engineer made changes to update the version of the application with the user data. The CI/CD pipeline has deployed a new version of the template. However, the health checks on the ALB are now failing. The health checks have marked all targets as unhealthy.

During investigation, the DevOps engineer notices that the CloudFormation stack has a status of UPDATE_COMPLETE. However, when the DevOps engineer connects to one of the EC2 instances and checks /var/log/messages, the DevOps engineer notices that the Apache web server failed to start successfully because of a configuration error.

How can the DevOps engineer ensure that the CloudFormation deployment will fail if the user data fails to successfully finish running?

  • A. Use the cfn-signal helper script to signal success or failure to CloudFormation. Use the WaitOnResourceSignals update policy within the CloudFormation template. Set an appropriate timeout for the update policy.
  • B. Create an Amazon CloudWatch alarm for the UnhealthyHostCount metric. Include an appropriate alarm threshold for the target group. Create an Amazon Simple Notification Service (Amazon SNS) topic as the target to signal success or failure to CloudFormation.
  • C. Create a lifecycle hook on the Auto Scaling group by using the AWS::AutoScaling::LifecycleHook resource. Create an Amazon Simple Notification Service (Amazon SNS) topic as the target to signal success or failure to CloudFormation. Set an appropriate timeout on the lifecycle hook.
  • D. Use the Amazon CloudWatch agent to stream the cloud-init logs. Create a subscription filter that includes an AWS Lambda function with an appropriate invocation timeout. Configure the Lambda function to use the SignalResource API operation to signal success or failure to CloudFormation.
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Suggested Answer: A 🗳️
by ParagSanyashiv at May 12, 2023, 8:14 a.m.
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Certified101
Highly Voted 1 year, 10 months ago
Selected Answer: A
A is correct
upvoted 6 times
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zijo
Most Recent 11 months, 1 week ago
Selected Answer: A
To ensure that the CloudFormation deployment fails if the user data script does not successfully finish, you can use a combination of AWS CloudFormation's CreationPolicy, cfn-signal, and wait condition resources. These mechanisms can signal CloudFormation about the success or failure of the instance creation process, including the execution of user data scripts.
upvoted 3 times
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dkp
1 year, 1 month ago
Selected Answer: A
A is correct
upvoted 2 times
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thanhnv142
1 year, 3 months ago
A is correct: <ensure that the CloudFormation deployment will fail if the user data fails to successfully finish running> means we need cfn-signal B, C and D: no mention of cfn-signal
upvoted 3 times
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sarlos
1 year, 4 months ago
yes A. https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/cfn-signal.html
upvoted 3 times
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svjl
1 year, 5 months ago
The instance is running, and the logs are available. The configuration happens inside the instance by the userdata. How A is correct if the issue is beyond CF?
upvoted 1 times
svjl
1 year, 5 months ago
Ok now make sense: https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/cfn-signal.html
upvoted 2 times
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OrganizedChaos25
2 years ago
A is correct
upvoted 1 times
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devnv
2 years ago
A is the right answer
upvoted 1 times
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ParagSanyashiv
2 years ago
Selected Answer: A
Agree with A
upvoted 2 times
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