← DOP-C02·Amazon Web Services

Question 860 of 1,750

SDLC Automation →mediumMultiple ChoiceObjective-mapped

Troubleshooting CodeDeploy Failure: Healthy Hosts Check

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.

An organization uses AWS CodeDeploy for automated deployments to EC2 instances. The deployment is failing 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.' The deployment group has a minimum healthy hosts setting of 75%. The application has 4 instances. What is the MOST likely issue?

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.

A
The AppSpec file references a script that does not exist.
Why wrong: This would cause failure on all instances if the script is in a critical lifecycle hook.
B
The IAM instance profile does not have sufficient permissions.
Why wrong: Permissions issue would cause failure on all instances.
C
The CodeDeploy agent is not installed on any of the instances.
Why wrong: If agent not installed, all instances would fail immediately.
D
The deployment failed on 2 instances, leaving only 2 healthy.
75% of 4 is 3; only 2 healthy is below threshold.

Full breakdown with real-world context →

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 failed on 2 instances, leaving only 2 healthy.

With a minimum healthy hosts setting of 75% and 4 instances, at least 3 instances must remain healthy during deployment. If 2 instances fail, only 2 are healthy (50%), which falls below the 75% threshold, causing CodeDeploy to abort the deployment to prevent further impact. This error message directly corresponds to the healthy host count dropping below the configured minimum.

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 AppSpec file references a script that does not exist.
Why it's wrong here
This would cause failure on all instances if the script is in a critical lifecycle hook.
✗
The IAM instance profile does not have sufficient permissions.
Why it's wrong here
Permissions issue would cause failure on all instances.
✗
The CodeDeploy agent is not installed on any of the instances.
Why it's wrong here
If agent not installed, all instances would fail immediately.
✓
The deployment failed on 2 instances, leaving only 2 healthy.
Why this is correct
75% of 4 is 3; only 2 healthy is below threshold.
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 may focus on individual instance failure causes (like missing scripts or permissions) instead of recognizing that the error message explicitly describes a fleet-wide healthy host count violation, making the math of 4 instances with 75% minimum the key diagnostic clue.

Detailed technical explanation

How to think about this question

CodeDeploy calculates the minimum healthy hosts as a percentage of the total instances in the deployment group, rounded down. For 4 instances at 75%, the threshold is 3 healthy instances (75% of 4 = 3). If during deployment any instance fails (e.g., due to script errors, health checks, or agent issues), CodeDeploy continuously monitors the count; once healthy instances drop to 2 (50%), the deployment is automatically rolled back or stopped. This behavior is critical in blue/green or in-place deployments to avoid cascading failures.

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.

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FAQ

Questions learners often ask

What does this DOP-C02 question test?

SDLC Automation — This question tests SDLC Automation — Read the scenario before looking for a memorised answer..

What is the correct answer to this question?

The correct answer is: The deployment failed on 2 instances, leaving only 2 healthy. — With a minimum healthy hosts setting of 75% and 4 instances, at least 3 instances must remain healthy during deployment. If 2 instances fail, only 2 are healthy (50%), which falls below the 75% threshold, causing CodeDeploy to abort the deployment to prevent further impact. This error message directly corresponds to the healthy host count dropping below the configured minimum.

What should I do if I get this DOP-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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