- A
The Auto Scaling group needs to have at least 3 instances to use AllAtOnce.
Why wrong: AllAtOnce can be used with any number of instances.
- B
The deployment configuration is not compatible with Auto Scaling groups.
Why wrong: CodeDeploy deployment configurations are compatible with Auto Scaling groups.
- C
The instances in the Auto Scaling group are not passing health checks.
Why wrong: If instances were unhealthy, they would be terminated by Auto Scaling, not cause this specific error.
- D
The deployment group has only 2 instances, and the deployment failed on one instance, causing the minimum healthy hosts threshold to be violated.
With AllAtOnce, all instances are deployed simultaneously; if one fails, the deployment fails because the minimum healthy hosts is not met.
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 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?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"most likely"Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
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.
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 deployment group has only 2 instances, and the deployment failed on one instance, causing the minimum healthy hosts threshold to be violated.
The error 'Deployment failed because the deployment group does not have enough instances to deploy to' occurs when the number of healthy instances in the deployment group falls below the minimum required by the deployment configuration. With CodeDeployDefault.AllAtOnce, the minimum healthy hosts threshold is 0, but the deployment still requires at least one healthy instance to succeed. In this scenario, the Auto Scaling group has a desired capacity of 2, and if one instance fails during deployment, the remaining healthy instance count drops to 1, which violates the implicit requirement that the deployment must complete on all instances without exceeding the failure threshold. The error message is misleading but points to the fact that the deployment failed on one instance, leaving the group with insufficient healthy hosts to meet the deployment's success criteria.
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.
- ✗
The Auto Scaling group needs to have at least 3 instances to use AllAtOnce.
Why it's wrong here
AllAtOnce can be used with any number of instances.
- ✗
The deployment configuration is not compatible with Auto Scaling groups.
Why it's wrong here
CodeDeploy deployment configurations are compatible with Auto Scaling groups.
- ✗
The instances in the Auto Scaling group are not passing health checks.
Why it's wrong here
If instances were unhealthy, they would be terminated by Auto Scaling, not cause this specific 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 this is correct
With AllAtOnce, all instances are deployed simultaneously; if one fails, the deployment fails because the minimum healthy hosts is not met.
Clue confirmation
The clue words "most likely", "minimum / minimize" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates misinterpret the error message 'does not have enough instances' as a sizing or configuration issue, when it actually indicates that the deployment failed on one or more instances, reducing the healthy instance count below what is needed to complete the deployment.
Detailed technical explanation
How to think about this question
CodeDeployDefault.AllAtOnce sets the minimum healthy hosts to 0, meaning the deployment will proceed even if all instances are updated simultaneously, but if any instance fails the deployment, the overall deployment fails because the deployment group must have at least one healthy instance to complete the revision. Under the hood, CodeDeploy calculates the number of 'available instances' based on the deployment group's current healthy instance count, and if the deployment fails on an instance, that instance is marked as failed, reducing the available count below the threshold. In real-world scenarios, this error often occurs when using a small Auto Scaling group (e.g., 2 instances) with AllAtOnce, as a single instance failure can cause the entire deployment to abort.
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 cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
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.
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FAQ
Questions learners often ask
What does this DVA-C02 question test?
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: The deployment group has only 2 instances, and the deployment failed on one instance, causing the minimum healthy hosts threshold to be violated. — The error 'Deployment failed because the deployment group does not have enough instances to deploy to' occurs when the number of healthy instances in the deployment group falls below the minimum required by the deployment configuration. With CodeDeployDefault.AllAtOnce, the minimum healthy hosts threshold is 0, but the deployment still requires at least one healthy instance to succeed. In this scenario, the Auto Scaling group has a desired capacity of 2, and if one instance fails during deployment, the remaining healthy instance count drops to 1, which violates the implicit requirement that the deployment must complete on all instances without exceeding the failure threshold. The error message is misleading but points to the fact that the deployment failed on one instance, leaving the group with insufficient healthy hosts to meet the deployment's success criteria.
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.
Are there clue words in this question I should notice?
Yes — watch for: "most likely", "minimum / minimize". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 24, 2026
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