← DOP-C02·Amazon Web Services

Question 855 of 1,750

SDLC Automation →mediumMultiple SelectObjective-mapped

Best Practices for CI/CD Pipeline for Containerized Apps on ECS

This DOP-C02 practice question tests your understanding of sdlc automation. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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.

Which TWO actions are best practices when designing a CI/CD pipeline for a containerized application on Amazon ECS? (Choose two.)

Clue words in this question

Noticing these words before you look at the options changes how you read each choice.

Clue: "best"
Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.

A
Run a full integration test suite on every commit to the repository.
Why wrong: Full suite on every commit is too heavy; use unit tests and selective integration tests.
B
Separate the build stage from the deploy stage in the pipeline.
Separation allows independent validation and rollback.
C
Build the Docker image in the deploy stage to ensure consistency.
Why wrong: Building in deploy stage mixes responsibilities; build should be earlier.
D
Use a rolling update with a fixed number of tasks for deployment.
Why wrong: Rolling update may cause downtime if health checks fail; blue/green is better.
E
Use a blue/green deployment strategy for the ECS service.
Blue/green provides zero-downtime deployment and easy rollback.

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

✓

Separate the build stage from the deploy stage in the pipeline.

Option B is correct because separating the build stage from the deploy stage in a CI/CD pipeline for Amazon ECS ensures that the Docker image is built, tested, and validated independently before being promoted to production. This decoupling allows you to reuse the same immutable artifact across multiple environments (e.g., dev, staging, prod), reducing the risk of environment-specific build inconsistencies and enabling rollback to a known good image.

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.

✗
Run a full integration test suite on every commit to the repository.
Why it's wrong here
Full suite on every commit is too heavy; use unit tests and selective integration tests.
✓
Separate the build stage from the deploy stage in the pipeline.
Why this is correct
Separation allows independent validation and rollback.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Build the Docker image in the deploy stage to ensure consistency.
Why it's wrong here
Building in deploy stage mixes responsibilities; build should be earlier.
✗
Use a rolling update with a fixed number of tasks for deployment.
Why it's wrong here
Rolling update may cause downtime if health checks fail; blue/green is better.
✓
Use a blue/green deployment strategy for the ECS service.
Why this is correct
Blue/green provides zero-downtime deployment and easy rollback.
Clue confirmation
The clue word "best" 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 often confuse 'rolling update' (a deployment configuration) with 'blue/green deployment' (a deployment strategy), and they may incorrectly select Option D because they think it provides the same safety guarantees as blue/green, but rolling updates with a fixed number of tasks lack the atomic traffic shift and instant rollback capabilities that blue/green offers.

Detailed technical explanation

How to think about this question

Under the hood, Amazon ECS supports blue/green deployments via AWS CodeDeploy, which uses an AppSpec file to define the task definition and container port mappings. The blue/green strategy leverages an Elastic Load Balancer (ELB) target group to shift traffic from the old (blue) to the new (green) service, and it automatically registers/deregisters tasks. This approach ensures that if the new version fails health checks, traffic is never routed to it, and a rollback simply re-routes traffic back to the blue environment without redeploying.

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: Separate the build stage from the deploy stage in the pipeline. — Option B is correct because separating the build stage from the deploy stage in a CI/CD pipeline for Amazon ECS ensures that the Docker image is built, tested, and validated independently before being promoted to production. This decoupling allows you to reuse the same immutable artifact across multiple environments (e.g., dev, staging, prod), reducing the risk of environment-specific build inconsistencies and enabling rollback to a known good image.

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: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.

What is the key concept behind this question?

Read the scenario before looking for a memorised answer.

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