Question 972 of 724
DVA-C02 CodeDeployDefault.AllAtOnce Practice Question
A company is using AWS CodeDeploy with an in-place deployment to an Auto Scaling group. The deployment fails with the error 'Deployment failed because the deployment group does not have enough instances to deploy to'. The Auto Scaling group has a minimum size of 2, maximum size of 5, and desired capacity of 2. The deployment configuration is CodeDeployDefault.AllAtOnce. What is the most likely cause?
⚠ Common exam trap
Candidates often misinterpret this error as a sizing or threshold issue, but it actually indicates that no healthy instances exist at deployment start, typically due to health check failures.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The instances in the Auto Scaling group are not passing health checks.
The error 'Deployment failed because the deployment group does not have enough instances to deploy to' occurs when there are zero healthy instances in the deployment group at the start of deployment. With CodeDeployDefault.AllAtOnce, the minimum number of healthy hosts is 0, so a single instance failure during deployment would not trigger this error. The most likely cause is that the instances in the Auto Scaling group are not passing health checks, resulting in no healthy instances available for deployment. Option C is correct.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
The Auto Scaling group needs to have at least 3 instances to use AllAtOnce.
Why it's wrong here
Incorrect. CodeDeployDefault.AllAtOnce has a minimum healthy hosts value of 0, so it does not require a specific number of instances to start the deployment.
- ✗
The deployment configuration is not compatible with Auto Scaling groups.
Why it's wrong here
Incorrect. CodeDeployDefault.AllAtOnce is compatible with Auto Scaling groups. This error is not due to incompatibility.
- ✓
The instances in the Auto Scaling group are not passing health checks.
Why this is correct
Correct. If instances fail health checks, they are not considered healthy, leading to zero healthy instances in the deployment group, which causes this error.
- ✗
The deployment group has only 2 instances, and the deployment failed on one instance, causing the minimum healthy hosts threshold to be violated.
Why it's wrong here
Incorrect. A failure on one instance during deployment does not violate the minimum healthy hosts threshold because AllAtOnce allows all instances to be updated simultaneously with no minimum healthy hosts required.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Last reviewed: Jun 24, 2026
This DVA-C02 practice question is part of Courseiva's free Amazon Web Services certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the DVA-C02 exam.
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.