The answer is to modify the application_start.sh script to check for the existence of the path before running the restart command. This resolves the CodeDeploy agent script path missing error because the script is failing with exit code 1 when it attempts to use a path that does not exist on all instances, causing the overall deployment to fail. On the AWS Certified DevOps Engineer Professional DOP-C02 exam, this scenario tests your understanding of lifecycle event hooks and the importance of idempotent scripting in deployment automation—a common trap is to blame the agent or bypass the script, but the root cause is always the script logic. The correct fix ensures the script gracefully handles missing paths, preventing future failures without altering the deployment strategy. Memory tip: “Scripts should be resilient, not reliant—always check paths before you act.”
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.
You are a DevOps engineer at a company that runs a critical web application on Amazon EC2 instances behind an Application Load Balancer (ALB). The application is deployed using AWS CodeDeploy with an in-place deployment strategy. The deployment group contains 10 EC2 instances in an Auto Scaling group. Recently, a deployment failed with the error 'The overall deployment failed because too many individual instances failed deployment.' You check the CodeDeploy agent logs on one of the failed instances and see the error 'Script at /opt/codedeploy-agent/deployment-root/deployment-logs/scripts/application_start.sh failed with exit code 1.' The application_start.sh script is part of the AppSpec file. The script attempts to restart the web server. You notice that the script uses a path that exists only on some instances. What should you do to resolve this issue and prevent future failures?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Modify the application_start.sh script to check for the existence of the path before running the restart command.
Option D is correct because the script should check if the path exists before using it, preventing failure. Option A is wrong because it does not fix the script logic. Option B is wrong because the failure is due to the script, not the agent. Option C is wrong because the script should be fixed, not bypassed.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Increase the deployment timeout in CodeDeploy.
Why it's wrong here
Timeout is not the issue; the script fails immediately.
✓
Modify the application_start.sh script to check for the existence of the path before running the restart command.
Why this is correct
Adding a check prevents failure when the path does not exist.
Related concept
Static NAT maps one inside address to one outside address.
✗
Remove the application_start.sh script from the AppSpec file.
Why it's wrong here
Removing the script may leave the application not started.
✗
Reinstall the CodeDeploy agent on all instances.
Why it's wrong here
The agent is working; the script fails.
Common exam traps
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
Static NAT maps one inside address to one outside address.
PAT allows many inside hosts to share one public address using ports.
Inside local and inside global describe the private and translated addresses.
NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
→Identify inside and outside interfaces first.
→Check whether the scenario needs static NAT, dynamic NAT or PAT.
→Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
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. NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated. 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.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related DOP-C02 NAT questions on configuration and troubleshooting.
SDLC Automation — This question tests SDLC Automation — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Modify the application_start.sh script to check for the existence of the path before running the restart command. — Option D is correct because the script should check if the path exists before using it, preventing failure. Option A is wrong because it does not fix the script logic. Option B is wrong because the failure is due to the script, not the agent. Option C is wrong because the script should be fixed, not bypassed.
What should I do if I get this DOP-C02 question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related DOP-C02 NAT questions on configuration and troubleshooting.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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Question Discussion
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