All 7 AWS Elastic Beanstalk questions
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What is AWS Elastic Beanstalk and how does it simplify deploying applications compared to manually configuring infrastructure? What is the difference between an Elastic Beanstalk application and an environment? How does Elastic Beanstalk handle application updates and deployment policies such as rolling and immutable deployments? How does Elastic Beanstalk use configuration files, commonly called ebextensions, to customize the underlying environment? How does Elastic Beanstalk's underlying use of CloudFormation give advanced users more control over the resources it creates? When should a team choose Elastic Beanstalk versus more granular services like ECS, EKS, or manually managed EC2 for deploying an application?
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How does Elastic Beanstalk support blue green deployments using environment swapping?

Intermediate

Answer

Elastic Beanstalk supports a blue green deployment approach by letting you create a brand new environment running the updated application version alongside your existing live environment, thoroughly test the new environment while it is completely separate from production traffic, and then perform a CNAME swap that instantly redirects traffic from the old environment to the new one, with the ability to swap back immediately if any problem is discovered after the switch.
eb swap old-environment-name --destination-name new-environment-name
Real-world example A company preparing a major application update creates a completely new Elastic Beanstalk environment for the updated version, thoroughly validates it separately from live traffic, then performs a CNAME swap to instantly cut production traffic over, keeping the old environment ready as an instant rollback option.

Common follow-ups: How quickly does traffic switch over after performing a CNAME swap?;What happens to the old environment after a successful swap?

Amazon Route 53 & DNS Management;AWS CodePipeline CodeBuild & CodeDeploy (CI/CD)
All 7 AWS Elastic Beanstalk questions