Quick Answer
The answer is that more than 25% of the instances failed the deployment. This is correct because the error message directly correlates with the minimum healthy instances configuration of 75%, meaning if the unhealthy count exceeds 25%, the deployment fails by design. AWS CodeDeploy continuously monitors instance health during a deployment, and when the proportion of failed or unhealthy instances surpasses the configured threshold, it aborts the process to prevent cascading failures. On the AWS Certified DevOps Engineer Professional DOP-C02 exam, this question tests your understanding of deployment group health requirements versus other common failure modes like IAM misconfigurations or agent timeouts, which produce distinct error messages. A frequent trap is confusing a minimum healthy instances setting with a maximum failure count—they are two sides of the same coin. Memory tip: think of it as the 75/25 rule—if your healthy floor is 75%, your failure ceiling is automatically 25%.
This DOP-C02 practice question tests your understanding of sdlc automation. 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.
During a deployment using AWS CodeDeploy, the deployment fails with the error 'The overall deployment failed because too many individual instances failed deployment, too few healthy instances are available, or some instances in your deployment group are experiencing problems.' The deployment group is configured with a minimum healthy instances of 75%. What could be the cause?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "minimum / minimize"
Why it matters: Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
The deployment configuration timeout is too short.
Why wrong: Would cause a timeout error.
The CodeDeploy service role does not have sufficient permissions.
Why wrong: Would cause an authorization error.
The instances are not running the CodeDeploy agent.
Why wrong: Would cause a specific error about agent not found.
More than 25% of the instances failed the deployment.
The minimum healthy instances threshold was breached.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
More than 25% of the instances failed the deployment.
Option A is correct because the error indicates too many instances failed or are unhealthy. The minimum healthy instances setting of 75% means at least 75% of instances must remain healthy; if more than 25% fail, the deployment fails. Option B is wrong because IAM permissions would cause a different error. Option C is wrong because that error would be about failing to reach instances. Option D is wrong because CodeDeploy agent timeout would show a specific error.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
The deployment configuration timeout is too short.
Why it's wrong here
Would cause a timeout error.
The CodeDeploy service role does not have sufficient permissions.
Why it's wrong here
Would cause an authorization error.
The instances are not running the CodeDeploy agent.
Why it's wrong here
Would cause a specific error about agent not found.
More than 25% of the instances failed the deployment.
Why this is correct
The minimum healthy instances threshold was breached.
Clue confirmation
The clue word "minimum / minimize" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
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
Identify which DOP-C02 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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FAQ
SDLC Automation — This question tests SDLC Automation — Read the scenario before looking for a memorised answer..
The correct answer is: More than 25% of the instances failed the deployment. — Option A is correct because the error indicates too many instances failed or are unhealthy. The minimum healthy instances setting of 75% means at least 75% of instances must remain healthy; if more than 25% fail, the deployment fails. Option B is wrong because IAM permissions would cause a different error. Option C is wrong because that error would be about failing to reach instances. Option D is wrong because CodeDeploy agent timeout would show a specific error.
Identify which DOP-C02 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Yes — watch for: "minimum / minimize". Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 20, 2026
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