← DVA-C02·Amazon Web Services

Question 1,011 of 1,616

Deployment →easyMultiple ChoiceObjective-mapped

Zero-Downtime Deployment on ECS with Blue/Green Strategy

This DVA-C02 practice question tests your understanding of deployment. 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 is deploying a containerized application on Amazon ECS using the Fargate launch type. The deployment must ensure zero downtime. Which ECS deployment configuration should be used?

A
Rolling update with a minimum healthy percent of 50% and maximum percent of 200%
Why wrong: Rolling update can result in some downtime if not enough capacity to run old and new versions simultaneously.
B
Set the task placement strategy to REPLICA
Why wrong: REPLICA is a task placement strategy, not a deployment type.
C
Use the DAEMON scheduling strategy with a deployment circuit breaker
Why wrong: DAEMON is for running one task per instance, not for zero-downtime deployment.
D
Blue/green deployment using AWS CodeDeploy
Blue/green deployment with CodeDeploy allows you to test new version before shifting traffic, ensuring zero downtime.

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

✓

Blue/green deployment using AWS CodeDeploy

Blue/green deployment using AWS CodeDeploy is correct because it creates a separate, fully functional replacement environment (green) alongside the existing one (blue), allowing traffic to be switched instantly after validation. This ensures zero downtime by avoiding in-place updates that could temporarily reduce capacity or serve errors during the transition. For ECS Fargate, CodeDeploy orchestrates the shift using an AppSpec file and can automatically roll back on health check failures.

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.

✗
Rolling update with a minimum healthy percent of 50% and maximum percent of 200%
Why it's wrong here
Rolling update can result in some downtime if not enough capacity to run old and new versions simultaneously.
✗
Set the task placement strategy to REPLICA
Why it's wrong here
REPLICA is a task placement strategy, not a deployment type.
✗
Use the DAEMON scheduling strategy with a deployment circuit breaker
Why it's wrong here
DAEMON is for running one task per instance, not for zero-downtime deployment.
✓
Blue/green deployment using AWS CodeDeploy
Why this is correct
Blue/green deployment with CodeDeploy allows you to test new version before shifting traffic, ensuring zero downtime.
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 assume a rolling update with high maximum percent (like 200%) guarantees zero downtime, but they overlook that the minimum healthy percent of 50% can still cause a capacity dip, and in-place updates inherently risk serving errors during the transition, whereas blue/green deployments provide true isolation and instant traffic switching.

Detailed technical explanation

How to think about this question

Under the hood, CodeDeploy manages the blue/green deployment by creating a new ECS service (green) with its own task set, registering it with a target group, and then updating the listener rules on an Application Load Balancer to shift traffic from blue to green. This allows for canary testing (e.g., shifting 10% of traffic) before full cutover, and the original blue environment remains intact for immediate rollback. A real-world scenario where this matters is a critical payment processing service where even a single failed request during deployment could cause financial loss or customer dissatisfaction.

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 DVA-C02 question test?

Deployment — This question tests Deployment — Read the scenario before looking for a memorised answer..

What is the correct answer to this question?

The correct answer is: Blue/green deployment using AWS CodeDeploy — Blue/green deployment using AWS CodeDeploy is correct because it creates a separate, fully functional replacement environment (green) alongside the existing one (blue), allowing traffic to be switched instantly after validation. This ensures zero downtime by avoiding in-place updates that could temporarily reduce capacity or serve errors during the transition. For ECS Fargate, CodeDeploy orchestrates the shift using an AppSpec file and can automatically roll back on health check failures.

What should I do if I get this DVA-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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Same concept, more angles

1 more ways this is tested on DVA-C02

These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.

Variation 1. A company is implementing a CI/CD pipeline for a containerized application using Amazon ECS and AWS CodePipeline. The team wants to ensure zero-downtime deployments. Which THREE strategies should the team implement? (Choose THREE.)

hard

✓ A.Use a blue/green deployment strategy with an Application Load Balancer.
B.Use a rolling update with a fixed batch size of 100% of tasks.
✓ C.Use ECS service auto scaling to maintain desired count during deployment.
✓ D.Configure the ECS service with health check grace period.
E.Stop all existing tasks before starting new tasks.

Why A: Options A, C, and D are correct. A blue/green deployment with an ALB (A) switches traffic after new tasks are healthy, ensuring zero downtime. ECS service auto scaling (C) maintains the desired count during deployment, preventing scale-down. A health check grace period (D) allows new tasks time to become healthy before being considered unhealthy. Option B (rolling update with 100% batch) would replace all tasks at once, causing downtime. Option E (stop all tasks before starting new ones) also causes downtime.

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This DVA-C02 practice question is part of Courseiva's free Amazon Web Services certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the DVA-C02 exam.