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Difficulty: MediumDeployment Strategies

A developer is planning a deployment strategy for a high-traffic production application hosted on AWS Elastic Beanstalk. The application must maintain its full provisioned instance capacity during the deployment to avoid performance degradation. Additionally, if the new application version fails initial health checks, the environment must immediately roll back to the previous version without performing a secondary deployment process.

Which two Elastic Beanstalk deployment strategies will meet these requirements? (Select TWO).

  1. ImmutableAnswer
  2. Traffic splittingAnswer
  3. C
    Rolling
  4. D
    Rolling with additional batch
  5. E
    All-at-once

Answer

The Immutable and Traffic splitting deployment strategies satisfy both the capacity and rollback requirements.
The Immutable and Traffic splitting deployment strategies both deploy the new application version to a separate, temporary Auto Scaling group while keeping the original instances fully operational. This satisfies the requirement to maintain 100% capacity. If the update fails health checks, both strategies achieve an immediate rollback by redirecting traffic away from the new instances and terminating the temporary Auto Scaling group, without needing a secondary rolling update.

Step-by-Step Solution

1
Analyze capacity constraints during the deployment process.
The application must maintain 100% of its provisioned instance capacity. This rules out strategies like Rolling, which temporarily take active instances out of service, and All-at-once, which takes all instances offline.
Maintaining capacity prevents performance degradation under high traffic.
2
Analyze rollback constraints on health check failure.
The rollback must be immediate and not require another deployment process. This rules out Rolling with additional batch, because reverting requires performing another rolling update deployment to push the old code back to the instances.
An immediate rollback minimizes the duration of any potential user impact.
3
Identify strategies that launch a temporary Auto Scaling group.
Immutable and Traffic splitting both launch a parallel Auto Scaling group to test the new version while keeping the original group untouched. This maintains capacity and allows instant rollback by redirecting traffic or terminating the temporary group.
These strategies isolate the new deployment from the existing running instances until verification succeeds.

Key Concept

Elastic Beanstalk Deployment Strategies
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Topics

Deployment Strategies

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