- A
Use the docker tag command to tag images with a timestamp.
Why wrong: Tagging does not implement lifecycle policies.
- B
Create an ECR lifecycle policy for the repository.
Lifecycle policies are applied to the repository.
- C
Add a lifecycle policy rule in the buildspec.yml file.
Why wrong: buildspec.yml is for build commands, not lifecycle policies.
- D
Configure the lifecycle policy in the CodeBuild project settings.
Why wrong: CodeBuild does not manage ECR lifecycle policies.
- E
Define a rule that expires untagged images after 14 days.
The policy must include a rule to expire untagged images.
Question 1,631 of 1,750
Creating an ECR Lifecycle Policy to Expire Untagged Images
This DOP-C02 practice question tests your understanding of sdlc automation. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 has a CI/CD pipeline that builds a Docker image and pushes it to Amazon ECR. The build step uses AWS CodeBuild. The engineer wants to ensure that the ECR repository has a lifecycle policy to expire untagged images after 14 days. Which TWO actions are required? (Choose 2.)
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 an ECR lifecycle policy for the repository.
Option B is correct because ECR lifecycle policies are configured at the repository level, not in CodeBuild or buildspec files. Option E is correct because the rule must specifically target untagged images and set an expiration of 14 days using the `expire` action with `sinceImagePushed` and `countType` set to `sinceImagePushed` and `countNumber` set to 14. Together, these two actions ensure the lifecycle policy exists and contains the correct rule to expire untagged images after 14 days.
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.
- ✗
Use the docker tag command to tag images with a timestamp.
Why it's wrong here
Tagging does not implement lifecycle policies.
- ✓
Create an ECR lifecycle policy for the repository.
Why this is correct
Lifecycle policies are applied to the repository.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Add a lifecycle policy rule in the buildspec.yml file.
Why it's wrong here
buildspec.yml is for build commands, not lifecycle policies.
- ✗
Configure the lifecycle policy in the CodeBuild project settings.
Why it's wrong here
CodeBuild does not manage ECR lifecycle policies.
- ✓
Define a rule that expires untagged images after 14 days.
Why this is correct
The policy must include a rule to expire untagged images.
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 confuse where lifecycle policies are configured (ECR repository level) with where build steps are defined (CodeBuild or buildspec), leading them to incorrectly select options that involve CodeBuild or buildspec modifications.
Trap categories for this question
Command / output trap
buildspec.yml is for build commands, not lifecycle policies.
Detailed technical explanation
How to think about this question
ECR lifecycle policies use JSON rules with `rulePriority`, `description`, `selection` (which includes `tagStatus` such as `untagged`, `tagged`, or `any`), and `action` (which is always `expire`). The `countNumber` in the `selection` block specifies the number of days when `countType` is set to `sinceImagePushed`. Under the hood, ECR evaluates these rules every 24 hours, and images that match the rule are automatically deleted, freeing up storage and reducing costs. A real-world scenario is a CI/CD pipeline that produces many intermediate images; without a lifecycle policy, these untagged images accumulate and can lead to repository bloat and unexpected storage charges.
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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SDLC Automation — study guide chapter
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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 an ECR lifecycle policy for the repository. — Option B is correct because ECR lifecycle policies are configured at the repository level, not in CodeBuild or buildspec files. Option E is correct because the rule must specifically target untagged images and set an expiration of 14 days using the `expire` action with `sinceImagePushed` and `countType` set to `sinceImagePushed` and `countNumber` set to 14. Together, these two actions ensure the lifecycle policy exists and contains the correct rule to expire untagged images after 14 days.
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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