Exam AWS Certified Developer - Associate DVA-C02 topic 1 question 62 discussion

Explanation: The rolling with additional batch deployment policy allows Elastic Beanstalk to launch additional instances in a new batch before terminating the old instances. In this case, specifying a batch size of 1 means that Elastic Beanstalk will deploy the application updates to 1 new instance at a time, ensuring that there are always at least 4 instances available during the deployment process. This method maintains application performance while minimizing the additional cost.

1. Rolling with additional batch deployment: This type of deployment maintains full capacity while new application versions are deployed. It launches a new batch of instances with the new application version, and if the new batch is healthy, it terminates a batch of instances running the old application version. 2. Batch size of 1: This will ensure that one new instance is launched with the new version of the application. Once it is deemed healthy, one of the old instances will be terminated. This will continue until all instances are running the new version, ensuring the capacity is never less than four instances. This approach will add only a minimal additional cost for the temporary overlapping instances during deployment.

A) Eliminated - Permanently increasing the desired capacity to six EC2 instances incurs unnecessary ongoing costs. B) Eliminated - Traffic splitting is primarily used for canary testing or gradual traffic shifting. It does not guarantee maintaining the desired instance capacity during deployment. D) Eliminated - A rolling deployment with a batch size of 2 means two instances are replaced at a time. With a fixed capacity of 5 instances, this would temporarily reduce the number of running instances to 3, causing performance degradation.

C is the correct answer.

Option D is the best solution because it allows the company to update the application without losing service or reducing availability significantly, and without increasing the cost or complexity of the solution.

https://docs.aws.amazon.com/elasticbeanstalk/latest/dg/using-features.rolling-version-deploy.html

The correct answer is: C

The correct answer is: D. Change the deployment policy to rolling. Specify a batch size of 2. A rolling deployment policy will deploy the new application version to one batch of instances at a time, while the other batches continue to serve traffic. This ensures that the application always has at least four instances available during the deployment. Specifying a batch size of 2 means that two instances will be deployed at a time. This is the most cost-effective option because it minimizes the number of instances that are needed to maintain application performance during the deployment. The other options are not as cost-effective because they require more instances to be running during the deployment. Option A requires six instances, option B requires at least five instances, and option C requires at least four instances.

C https://docs.aws.amazon.com/elasticbeanstalk/latest/dg/using-features.rolling-version-deploy.html