AWS Certified Developer Associate DVA-C02 Practice Question
Your team must deploy a new version of a production web application that is hosted in an AWS Elastic Beanstalk environment. The business demands zero downtime during the update and wants the ability to roll back instantly-even after the deployment completes-if any problems are found. Which Elastic Beanstalk deployment approach BEST satisfies these requirements?
Rolling with additional batch deployment
All at once deployment
Blue/Green deployment using environment CNAME swap
Blue/Green deployments create a separate Elastic Beanstalk environment that runs the new application version alongside the existing one. After you validate the new environment, you swap the two environments' CNAMEs so all traffic moves at once with no interruption. If issues are detected later, you can immediately swap the CNAMEs back, restoring the previous version in seconds. Immutable and rolling-based policies update instances inside the same environment; they preserve availability but require a redeployment to return to the previous version. All-at-once replaces every instance simultaneously, causing downtime and offering no rapid rollback.
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AWS Certified Developer Associate DVA-C02
Deployment
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