- A
Create a custom AMI that includes all dependencies and use it in the Auto Scaling group.
Baking dependencies into the AMI avoids runtime installation issues and ensures consistency.
- B
Use an Elastic Load Balancer health check to automatically replace failed instances.
Why wrong: Health checks replace instances but do not fix the script failure; new instances will also fail.
- C
Modify the CodeDeploy AppSpec file to run the installation script as root.
Why wrong: Running as root does not install missing dependencies.
- D
Implement a retry mechanism in the deployment script to install dependencies again.
Why wrong: Retrying does not address the root cause if dependencies are missing; it may eventually succeed but is not robust.
Question 763 of 1,750
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 team uses AWS CodeDeploy to deploy a web 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, or some instances in your deployment group are experiencing problems.' The team checks the logs and finds that the application installation script fails on some instances due to missing dependencies. What is the BEST long-term solution?
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
✓
Create a custom AMI that includes all dependencies and use it in the Auto Scaling group.
Creating a custom AMI that includes all dependencies ensures that every instance launched in the Auto Scaling group has the required software pre-installed. This eliminates the root cause of the deployment failure—missing dependencies—by baking them into the machine image, making deployments consistent and reliable. It is the best long-term solution because it avoids runtime dependency installation failures and reduces deployment time.
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.
- ✓
Create a custom AMI that includes all dependencies and use it in the Auto Scaling group.
Why this is correct
Baking dependencies into the AMI avoids runtime installation issues and ensures consistency.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Use an Elastic Load Balancer health check to automatically replace failed instances.
Why it's wrong here
Health checks replace instances but do not fix the script failure; new instances will also fail.
- ✗
Modify the CodeDeploy AppSpec file to run the installation script as root.
Why it's wrong here
Running as root does not install missing dependencies.
- ✗
Implement a retry mechanism in the deployment script to install dependencies again.
Why it's wrong here
Retrying does not address the root cause if dependencies are missing; it may eventually succeed but is not robust.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often choose a retry mechanism or health check fix, thinking they can handle transient failures, but the question specifies 'missing dependencies'—a persistent issue that requires a proactive, image-based solution rather than reactive or permission-based fixes.
Detailed technical explanation
How to think about this question
When using CodeDeploy with an Auto Scaling group, the deployment lifecycle includes the 'BeforeInstall' and 'Install' hooks defined in the AppSpec file. If dependencies are missing, the script fails at these hooks. A custom AMI pre-installs dependencies at the image level, ensuring that every instance launched from that AMI is identical and ready for deployment. This approach also reduces the risk of transient network issues during package downloads and speeds up instance boot time, which is critical for scaling events.
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 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: Create a custom AMI that includes all dependencies and use it in the Auto Scaling group. — Creating a custom AMI that includes all dependencies ensures that every instance launched in the Auto Scaling group has the required software pre-installed. This eliminates the root cause of the deployment failure—missing dependencies—by baking them into the machine image, making deployments consistent and reliable. It is the best long-term solution because it avoids runtime dependency installation failures and reduces deployment time.
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.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jul 4, 2026
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