The correct first step is to verify that the AWS CodeDeploy agent is installed and running on each EC2 instance. This is because CodeDeploy relies on a lightweight agent installed on the instance to poll for deployment instructions, download the revision, and execute the deployment lifecycle hooks; without a running agent, the instance cannot participate in the deployment at all, leading to the generic failure error about too many individual instances failing. On the AWS Certified DevOps Engineer Professional DOP-C02 exam, this question tests your ability to prioritize the most fundamental prerequisite for in-place deployments on Amazon Linux 2, often serving as a trap where candidates jump to IAM roles or security groups first. A common memory tip is to think of the agent as the “heartbeat” of CodeDeploy—if it’s not beating, nothing else matters. Remember: agent first, permissions second, network third.
DOP-C02 SDLC Automation Practice Question
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.
A company uses AWS CodeDeploy to deploy a web application to an Auto Scaling group of Amazon EC2 instances. 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.' The application is deployed to the instances using an in-place deployment. The instances are running Amazon Linux 2. What should the DevOps engineer check first?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "first"
Why it matters: Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Verify that the AWS CodeDeploy agent is installed and running on each EC2 instance.
Option A is correct because the CodeDeploy agent must be installed and running on the instances. If it is not, the deployment fails. Option B is wrong because security groups affect network access, not the agent. Option C is wrong because IAM instance profile permissions are needed but the agent must be running to use them. Option D is wrong because the application port is not directly related to the agent.
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 security group rules for the EC2 instances.
Why it's wrong here
Security groups are not the primary cause of this error.
✗
Check the application's port availability.
Why it's wrong here
Port availability is not related to the agent.
✓
Verify that the AWS CodeDeploy agent is installed and running on each EC2 instance.
Why this is correct
Without the agent, the instance cannot receive deployment instructions.
Clue confirmation
The clue word "first" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Verify that the IAM instance profile associated with the instances has the correct permissions.
Why it's wrong here
While important, the agent must be running first.
Common exam traps
Common exam trap: answer the scenario, not the keyword
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
How to think about this question
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.
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.
Use explanations to understand the rule behind the answer.
TExam Day Tips
→Underline the problem statement mentally.
→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 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.
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: Verify that the AWS CodeDeploy agent is installed and running on each EC2 instance. — Option A is correct because the CodeDeploy agent must be installed and running on the instances. If it is not, the deployment fails. Option B is wrong because security groups affect network access, not the agent. Option C is wrong because IAM instance profile permissions are needed but the agent must be running to use them. Option D is wrong because the application port is not directly related to the agent.
What should I do if I get this DOP-C02 question wrong?
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.
Are there clue words in this question I should notice?
Yes — watch for: "first". Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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 →
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. A company uses AWS CodeDeploy to deploy an application to an Auto Scaling group. 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.' The deployment is set to 'AllAtOnce'. The application revision is a simple index.html. What is the most likely cause?
hard
✓ A.The CodeDeploy agent is not installed or running on the EC2 instances.
B.The IAM instance profile does not have permissions to download from Amazon S3.
C.The application revision is not a compressed archive.
D.The deployment configuration 'AllAtOnce' is incompatible with Auto Scaling groups.
Why A: Option D is correct because the CodeDeploy agent must be installed on each EC2 instance in the Auto Scaling group to receive and execute deployments. Option A is wrong because AllAtOnce means all instances deploy simultaneously. Option B is wrong because S3 permissions are needed but would cause a different error. Option C is wrong because the revision is a single file, not a zip, but CodeDeploy requires a revision format; however, the error message suggests instance failure.
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This DOP-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 DOP-C02 exam.
Question Discussion
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