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Difficulty: EasyDeployment Strategies

A developer is updating a critical production web application deployed on AWS Elastic Beanstalk. The deployment process must ensure zero downtime and support an immediate rollback to the previous version if the new version fails health checks. Which two Elastic Beanstalk deployment strategies or options meet these requirements?

  1. Blue/Green deployment using a CNAME swapAnswer
  2. Immutable deploymentAnswer
  3. C
    All-at-once deployment
  4. D
    Rolling deployment
  5. E
    Rolling with additional batch deployment

Answer

The correct options are Blue/Green deployment using a CNAME swap and Immutable deployment.
Blue/Green deployment using a CNAME swap and Immutable deployment both satisfy the requirements. A Blue/Green deployment routes traffic to a completely separate environment, allowing an immediate rollback by swapping CNAME records back if the new version fails. An Immutable deployment deploys the new version to a temporary Auto Scaling group alongside the original one. If health checks fail, the temporary group is deleted immediately, leaving the original instances unaffected.

Step-by-Step Solution

1
Analyze the application requirements.
The application requires zero downtime and a method to roll back immediately if the update fails.
This filters out deployment strategies that cause downtime or have slow rollback mechanisms.
2
Evaluate the downtime characteristics of the deployment strategies.
All-at-once causes downtime, and Rolling reduces serving capacity. Immutable, Rolling with additional batch, and Blue/Green deployments do not cause downtime.
To maintain zero downtime and full capacity, we must look at strategies that avoid in-place service degradation.
3
Evaluate the rollback speed of the zero-downtime strategies.
Rolling with additional batch requires a slow, sequential redeployment to roll back. Immutable and Blue/Green deployments allow for an immediate rollback because they maintain the old version on separate, untouched instances.
Selecting strategies that support immediate rollback satisfies the final constraint.

Key Concept

AWS Elastic Beanstalk deployment strategies and their trade-offs regarding downtime, capacity, and rollback speed.
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Topics

Deployment Strategies

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