- A
Deploy stage with AWS CodeDeploy to ECS.
Deploy stage updates the ECS service.
- B
Build stage with AWS CodeBuild to build the Docker image and push to ECR.
Build stage creates the image.
- C
Manual approval stage.
Why wrong: Manual approval is not required for automation.
- D
Source stage with AWS CodeCommit or Amazon S3 as source.
Source stage fetches the source code.
- E
Test stage with AWS CodeBuild to run unit tests.
Why wrong: Test stage is optional.
Question 856 of 1,750
Essential Components for an ECS CI/CD Pipeline
This DOP-C02 practice question tests your understanding of sdlc automation. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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 is migrating to a microservices architecture on Amazon ECS with AWS Fargate. They want to automate the deployment process using AWS CodePipeline. The pipeline should build a Docker image, push it to Amazon ECR, and deploy the updated service to ECS. Which THREE components are required in the pipeline? (Choose 3.)
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
✓
Deploy stage with AWS CodeDeploy to ECS.
Option A is correct because AWS CodeDeploy is the native deployment service that integrates with Amazon ECS to perform blue/green deployments, rolling updates, and traffic shifting. In a CodePipeline, the Deploy stage uses CodeDeploy to orchestrate the ECS service update, ensuring zero-downtime deployments by managing task set creation and load balancer target group routing.
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.
- ✓
Deploy stage with AWS CodeDeploy to ECS.
Why this is correct
Deploy stage updates the ECS service.
Related concept
Read the scenario before looking for a memorised answer.
- ✓
Build stage with AWS CodeBuild to build the Docker image and push to ECR.
Why this is correct
Build stage creates the image.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Manual approval stage.
Why it's wrong here
Manual approval is not required for automation.
- ✓
Source stage with AWS CodeCommit or Amazon S3 as source.
Why this is correct
Source stage fetches the source code.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Test stage with AWS CodeBuild to run unit tests.
Why it's wrong here
Test stage is optional.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often think a manual approval or test stage is mandatory for a production pipeline, but the DOP-C02 exam focuses on the minimal required components for a functional CI/CD pipeline, which are source, build, and deploy.
Detailed technical explanation
How to think about this question
Under the hood, CodePipeline triggers CodeBuild to run a buildspec.yml that executes Docker commands (e.g., docker build, docker push) to create the image and store it in Amazon ECR. The Deploy stage then uses an ECS deploy action that references the task definition and appspec.yaml to instruct CodeDeploy to create a new ECS task set, shift traffic via the Application Load Balancer, and terminate the old task set, all while monitoring health checks.
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 media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
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: Deploy stage with AWS CodeDeploy to ECS. — Option A is correct because AWS CodeDeploy is the native deployment service that integrates with Amazon ECS to perform blue/green deployments, rolling updates, and traffic shifting. In a CodePipeline, the Deploy stage uses CodeDeploy to orchestrate the ECS service update, ensuring zero-downtime deployments by managing task set creation and load balancer target group routing.
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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