What should be done next to complete the update?
Redirect to the new environment using Amazon Route 53.
Select the Swap Environment URLs option.
Replace the Auto Scaling launch configuration.
Update the DNS records to point to the green environment.
Explanations:
Redirecting to the new environment using Amazon Route 53 is not necessary because swapping environment URLs is a built-in feature of Elastic Beanstalk that handles the redirection more seamlessly. Route 53 is typically used for managing DNS, but in this case, it’s not the most efficient step after deploying to a new environment.
Selecting the Swap Environment URLs option is the correct next step to complete the blue/green deployment. This action swaps the CNAMEs of the old and new environments, directing traffic to the new environment without any downtime. It allows for an immediate and efficient transition to the updated application version.
Replacing the Auto Scaling launch configuration is not relevant to the blue/green deployment process. This step involves changing the infrastructure settings rather than completing the deployment of the new application version. The new environment should already have its own launch configuration in place that is identical to the old environment.
Updating the DNS records to point to the green environment is unnecessary because the process of swapping environment URLs effectively manages the DNS change within Elastic Beanstalk. Manual DNS updates can introduce delays and complexities that are avoided through the built-in features of the service.
I gauge that the answer is:
Select the Swap Environment URLs option.