A retail company is currently hosting a Java-based application in its on-premises data center. Management wants the DevOps Engineer to move this application to AWS. Requirements state that while keeping high availability, infrastructure management should be as simple as possible. Also, during deployments of new application versions, while cost is an important metric, the Engineer needs to ensure that at least half of the fleet is available to handle user traffic. What option requires the LEAST amount of management overhead to meet these requirements?
A. Create an AWS CodeDeploy deployment group and associate it with an Auto Scaling group configured to launch instances across subnets in different
Availability Zones. Configure an in-place deployment with a CodeDeploy.HalfAtAtimeconfiguration for application deployments.
B. Create an AWS Elastic Beanstalk Java-based environment using Auto Scaling and load balancing. Configure the network setting for the environment to launch instances across subnets in different Availability Zones. Use "Rolling withadditional batch" as a deployment strategy with a batch size of 50%.
C. Create an AWS CodeDeploy deployment group and associate it with an Auto Scaling group configured to launch instances across subnets in different
Availability Zones. Configure an in-place deployment with a custom deploymentconfiguration with the MinimumHealthyHosts option set to type
FLEET_PERCENT and a value of 50.
D. Create an AWS Elastic Beanstalk Java-based environment using Auto Scaling and load balancing. Configure the network options for the environment to launch instances across subnets in different Availability Zones. Use "Rolling" as adeployment strategy with a batch size of 50%.
I think D
Rolling with batches keep 100% up yoiu need 50%. With rolling deployments, Elastic Beanstalk splits the
environment’s EC2 instances into batches and deploys the new version of the application to one batch at a
time, leaving the rest of the instances in the environment running the old version of the application.
https://docs.aws.amazon.com/elasticbeanstalk/latest/dg/using-features.rolling-version-deploy.html