Question #1009
A developer is troubleshooting an AWS CodeDeploy deployment failure with the error message: 'The overall deployment failed because too many individual instances failed deployment, too few healthy instances are available for deployment, or some instances in your deployment group are experiencing problems. (Error code: HEALTH-CONSTRAINTS)'. What are the two most likely causes of this issue?
The CodeDeploy agent was not installed on the instances targeted for deployment.
The Amazon EC2 instances lacked the required CloudTrail logging configuration.
The developer\u2019s IAM policy did not include permissions to access the deployment\u2019s source repository.
The deployment group\u2019s health check configuration referenced an invalid Elastic Load Balancer (ELB).
The instances were not configured with the latest AWS Systems Manager patches.
Explanation
The HEALTH-CONSTRAINTS error in AWS CodeDeploy indicates that health checks failed during deployment.
Correct Answers:
- A: The CodeDeploy agent must be installed on instances to enable communication with the service. Without it, instances cannot report deployment status, causing health check failures.
- D: If the deployment group's health check references an invalid ELB, CodeDeploy cannot verify instance health via the load balancer, leading to deployment abortion.
Incorrect Options:
- B: CloudTrail logging is unrelated to CodeDeploy's operational health checks.
- C: IAM permissions for the source repository would cause deployment setup failures, not health constraint errors.
- E: Systems Manager patches do not affect CodeDeploy's health checks unless the agent itself is outdated, which is not specified here.
Key Points:
1. Ensure the CodeDeploy agent is installed and running on target instances.
2. Validate health check configurations (e.g., ELB/ALB settings) in the deployment group.
Answer
The correct answer is: AD