The answer is to verify that the CodeDeploy agent is installed and running on the EC2 instance and to check the agent logs for detailed error messages. This is correct because when a deployment fails due to too many unhealthy instances, the root cause almost always lies in the agent’s inability to execute the revision or a script failure on the instance itself. The CodeDeploy agent logs, located at `/var/log/aws/codedeploy-agent/codedeploy-agent.log`, capture exit codes, missing dependency errors, and permission issues that the AWS console cannot surface. On the AWS Certified Developer Associate DVA-C02 exam, this scenario tests your understanding that the agent is the bridge between the CodeDeploy service and the instance; a common trap is to immediately check IAM roles or security groups, but the first step in codedeploy ec2 deployment failure troubleshooting is always to inspect the local agent state and logs. Remember the mnemonic “Agent First, Logs Last” — ensure the agent is running before diving into the logs, as a stopped agent will produce no log entries at all.
DVA-C02 Deployment Practice Question
This DVA-C02 practice question tests your understanding of deployment. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A developer is using AWS CodeDeploy to deploy a revision to an Amazon EC2 instance. The deployment fails with the error '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.' Which TWO actions should the developer take to troubleshoot the issue? (Choose TWO.)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Check the CodeDeploy agent logs on the EC2 instance for errors.
Option A is correct because the CodeDeploy agent logs on the EC2 instance contain detailed error messages about why the deployment script failed, such as script exit codes, missing dependencies, or permission issues. Checking these logs is the first step in diagnosing individual instance failures, as the agent writes events to `/var/log/aws/codedeploy-agent/codedeploy-agent.log`.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✓
Check the CodeDeploy agent logs on the EC2 instance for errors.
Why this is correct
Agent logs provide detailed error messages.
Related concept
Read the scenario before looking for a memorised answer.
✗
Change the deployment configuration to AllAtOnce.
Why it's wrong here
Changing the configuration may not fix the underlying issue.
✗
Verify that the EC2 instance has an IAM role that allows CodeDeploy to access it.
Why it's wrong here
The instance profile is for the instance to access CodeDeploy, not the other way around.
✓
Verify that the CodeDeploy agent is installed and running on the instance.
Why this is correct
If the agent is not running, deployments will fail.
Related concept
Read the scenario before looking for a memorised answer.
✗
Increase the health check grace period on the Auto Scaling group.
Why it's wrong here
This is for ELB health checks, not CodeDeploy.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse the deployment configuration (AllAtOnce) with a troubleshooting step, when in fact it only changes the rollout speed and does not help diagnose why individual instances are failing.
Detailed technical explanation
How to think about this question
The CodeDeploy agent runs as a background service on the EC2 instance and polls the CodeDeploy service for deployment instructions. When a deployment fails, the agent logs the exact step that failed (e.g., `BeforeInstall`, `AfterInstall`, `ApplicationStart`) along with the script output and exit codes. In real-world scenarios, common causes include missing environment variables, incorrect file permissions, or a script that exits with a non-zero code, all of which are visible only in the agent logs.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Deployment — This question tests Deployment — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Check the CodeDeploy agent logs on the EC2 instance for errors. — Option A is correct because the CodeDeploy agent logs on the EC2 instance contain detailed error messages about why the deployment script failed, such as script exit codes, missing dependencies, or permission issues. Checking these logs is the first step in diagnosing individual instance failures, as the agent writes events to `/var/log/aws/codedeploy-agent/codedeploy-agent.log`.
What should I do if I get this DVA-C02 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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