You have deployed an application on an EC2 Instance.
This application makes calls to a DynamoDB service.
There are numerous performance issues present in the application.
You decide to use the XRay service to debug the performance issues.
You are not able to see the trails in the XRay service.
Which of the following could be the underlying issue? Choose 2 answers from the options given below.
Click on the arrows to vote for the correct answer
A. B. C. D.Answer - A and C.
You need to have the daemon service running on the EC2 Instance.
And a role needs to be attached to the EC2 Instance.
Running the X-Ray Daemon on Amazon EC2
You can run the X-Ray daemon on the following operating systems on Amazon EC2.
Amazon Linux.
Ubuntu.
Windows Server (2012 R2 and newer)
Use an instance profile to grant the daemon permission to upload trace data to X-Ray.
For more information, see Giving the Daemon Permission to Send Data to X-Ray.
Option B is incorrect since the agent can be installed on different types of instances.
Option D is incorrect since the traces need to be sent to the X-Ray service.
For more information on the X-Ray daemon service, please refer to the below URL-
https://docs.aws.amazon.com/xray/latest/devguide/xray-daemon-ec2.htmlThe X-Ray service provides tracing of requests in distributed systems, making it easier to identify issues and pinpoint their root cause. When using X-Ray to debug performance issues in an application that makes calls to a DynamoDB service from an EC2 instance, the trails may not be visible due to one or more of the following reasons:
A. The X-Ray daemon is not installed on the EC2 Instance. The X-Ray daemon is a software component that runs on the EC2 instance and intercepts the outgoing requests from the application to the DynamoDB service. It is responsible for generating trace data and forwarding it to the X-Ray service. If the X-Ray daemon is not installed on the EC2 instance, there will be no trace data to display in the X-Ray console. To resolve this issue, install the X-Ray daemon on the EC2 instance.
B. The right AMI is not chosen for the EC2 Instance. The AMI (Amazon Machine Image) is the pre-configured virtual machine image used to create an EC2 instance. If the AMI used to create the EC2 instance does not have the X-Ray daemon pre-installed, it will not be possible to generate and upload trace data to the X-Ray service. To resolve this issue, choose an AMI that has the X-Ray daemon pre-installed or manually install the X-Ray daemon on the EC2 instance.
C. Ensure that the IAM Role attached to the Instance has permission to upload data onto X-Ray. The IAM Role attached to the EC2 instance must have the necessary permissions to upload trace data to the X-Ray service. If the IAM Role does not have the required permissions, the X-Ray daemon will not be able to upload the trace data to the X-Ray service. To resolve this issue, modify the IAM Role to include the necessary permissions for the X-Ray service.
D. Ensure that the IAM Role attached to the Instance has permission to upload data onto Cloudwatch. The IAM Role attached to the EC2 instance must have the necessary permissions to upload trace data to CloudWatch if you are using it as the storage backend for X-Ray. If the IAM Role does not have the required permissions, the X-Ray daemon will not be able to upload the trace data to CloudWatch. To resolve this issue, modify the IAM Role to include the necessary permissions for CloudWatch.
In summary, to resolve the issue of trails not appearing in the X-Ray service when debugging performance issues in an application that makes calls to a DynamoDB service from an EC2 instance, it is necessary to ensure that the X-Ray daemon is installed on the EC2 instance, the right AMI is chosen for the EC2 instance, and the IAM Role attached to the EC2 instance has the necessary permissions to upload data to the X-Ray service and/or CloudWatch.