The answer is to add an IAM policy statement with `ecs:UpdateService` on a wildcard resource. This permission is required because CodePipeline must be able to call the ECS UpdateService API action after a new Docker image is pushed to Amazon ECR, instructing the ECS service to redeploy using the updated task definition—the exact step that fails when the role lacks this permission. On the AWS Certified Solutions Architect Professional SAP-C02 exam, this scenario tests your understanding of how CodePipeline’s service role interacts with ECS deployments, and a common trap is overcomplicating the resource ARN; the wildcard is acceptable here because the pipeline’s trust policy and ECS resource policies already scope access. Remember the key action is `ecs:UpdateService`—think of it as the “trigger” that tells ECS to refresh its running tasks. A simple memory tip: “Update to deploy, wildcard is okay.”
SAP-C02 Continuous Improvement for Existing Solutions Practice Question
This SAP-C02 practice question tests your understanding of continuous improvement for existing solutions. 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 company uses AWS CodePipeline to automate deployments of a microservices application to Amazon ECS. The pipeline builds a Docker image, pushes it to Amazon ECR, and updates the ECS service. Recently, deployments have failed because insufficient IAM permissions cause the pipeline to fail when updating the ECS service. The development team wants to implement least privilege permissions. Which IAM policy statement should be added to the CodePipeline service role to allow it to update the ECS service?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "least"
Why it matters: You want the option with minimum overhead, fewest steps, or lowest impact — not the most feature-rich or comprehensive answer.
Option A is correct because the CodePipeline service role needs the ecs:UpdateService permission to trigger an ECS service update after a new Docker image is pushed to Amazon ECR. This action allows the pipeline to instruct ECS to redeploy the service using the updated task definition, which is the specific step that was failing due to insufficient permissions. The resource wildcard is acceptable here because the pipeline role is scoped by the pipeline's own trust policy and resource-based policies on the ECS service.
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.
RegisterTaskDefinition is for registering task definitions, not updating services.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse the permissions needed for different stages of the pipeline (e.g., pushing to ECR or registering a task definition) with the specific permission required to update the ECS service, leading them to select options that are valid for other actions but not for the failing step.
Detailed technical explanation
How to think about this question
When CodePipeline updates an ECS service, it calls the ECS UpdateService API with the forceNewDeployment parameter set to true, which triggers a new deployment using the latest task definition revision. The pipeline service role must have ecs:UpdateService permission on the specific ECS service ARN or use a wildcard if the pipeline is scoped to a single account. In practice, you should restrict the resource to the specific ECS service ARN (e.g., arn:aws:ecs:region:account-id:service/cluster-name/service-name) to follow least privilege, but the exam often accepts the wildcard as a valid answer when the question emphasizes fixing the failing step.
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 company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
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.
Continuous Improvement for Existing Solutions — This question tests Continuous Improvement for Existing Solutions — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: {"Effect":"Allow","Action":["ecs:UpdateService"],"Resource":"*"} — Option A is correct because the CodePipeline service role needs the ecs:UpdateService permission to trigger an ECS service update after a new Docker image is pushed to Amazon ECR. This action allows the pipeline to instruct ECS to redeploy the service using the updated task definition, which is the specific step that was failing due to insufficient permissions. The resource wildcard is acceptable here because the pipeline role is scoped by the pipeline's own trust policy and resource-based policies on the ECS service.
What should I do if I get this SAP-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: "least". You want the option with minimum overhead, fewest steps, or lowest impact — not the most feature-rich or comprehensive answer.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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