Exam AWS Certified DevOps Engineer - Professional DOP-C02 topic 1 question 116 discussion

Option A is also a valid approach that can meet the requirements with MINIMAL changes to the application. In Option A, the changes are introduced as a separate environment parallel to the existing one. This new environment can be used to deploy the new version of the application. By configuring API Gateway to use a canary release deployment, a small subset of user traffic is directed to the new environment, while the majority of traffic continues to be routed to the existing environment hosting the current version of the application.

Keywords: minimal disruptions, MINIMAL changes

I chose A because the question says MINIMAL changes to the application. Canary deployment needs minimal changes to the application as it requires only adding canary settings to the deployment stage. AWS API Gateway supports canary deployments, allowing you to route a percentage of your traffic to a new stage or version of your API.

C: Separate Target Group: By introducing a new target group behind the existing Application Load Balancer, you can direct traffic to this new target group without affecting the existing environment. This means the new version of the application can be tested in isolation. Step-by-Step Traffic Routing: API Gateway allows you to gradually shift user traffic from one target group (existing version) to another (new version). This means you can start with a small percentage of traffic and gradually increase it, allowing you to monitor the new version's performance and stability. Quick Rollback: If the new version has any issues, you can quickly revert the traffic to the original target group, ensuring minimal disruption to users. Separate Environment with Canary Deployment: This introduces a completely separate environment, requiring additional infrastructure management and potentially more configuration changes depending on how the environments are set up.

Agree with A. A parallel environment will allow the company to test the deployment, do smoke tests and all the basic stuff to check if the application is working fine. Then, they can start serving traffic to the users, allowing 10% of the users to go to the new environment and test. The key is the word "disruptions" disruption can be considered a failure in the infrastructure, in the communications (networking) but NOT a Bug. Even do, switching 10% of the users to test is best than switching the entire loadbalancer to a new target group because in this scenarios is 100% of users affect against 10% Details are everything during an investigation...

A is not meet the "MINIMAL changes to the application" requirement. If application receives requests from a different ALB, the application will receive a different request value, such as HTTP headers, and may need to be modified application. Since D is the same ALB, it is unlikely that changes will be necessary.

A is correct: <users experience minimal disruptions during any deployment of a new version of the application.> and <ensure it can quickly roll back updates if there is an issue> means deploy in parallel: canary release or blue/green deployment B, C and D: If there was a large bug with the a new version, users would experience huge service disruptions

Canary deployment is used to stop disruption hence I have voted A

Answer is D. Even API supports canary deployment it is only if the API can redirect the traffic between two stages, in this case the API sends the traffic directly to the ALB, and from the ALB yo can choose to which environment redirect the traffic

Why not Option D, as the deployment is API gateway-->ALB-->target groups(EC2). and question is saying that: The company wants to ensure users experience minimal disruptions during any deployment of a new version of the application, with minimal changes to application (it is not saying that we shouldn't change deployment steps)

A is definitely correct

A is correct

A is correct answer

The correct answer is A Correct Answer is A. API Gateway supports canary deployment on a deployment stage before you direct all traffic to that stage. A parallel environment means we will create a new ALB and a target group that will target a new set of EC2 instances on which the newer version of the app will be deployed. So the canary setting associated to the new version of the API will connect with the new ALB instance which in turn will direct the traffic to the new EC2 instances on which the newer version of the application is deployed.

I disagree with C: https://docs.aws.amazon.com/apigateway/latest/developerguide/canary-release.html