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Difficulty: MediumDeployment Strategies

An organization is deploying updates to a high-traffic web application hosted on AWS Elastic Beanstalk. The application is highly sensitive to performance issues, so the deployment process must maintain 100%100\% of the current instance capacity at all times. Additionally, if the new version fails health checks, the deployment must support an immediate rollback that does not alter or disrupt the active instances in the original environment. Which two Elastic Beanstalk deployment policies will meet these requirements?

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

Answer

The Immutable and Traffic Splitting deployment policies should be selected.
The Immutable and Traffic Splitting policies both satisfy the constraints. The Immutable policy creates a temporary Auto Scaling group to launch the new version alongside the original one. Once health checks pass, traffic is shifted. Traffic Splitting routes a configured percentage of traffic to a new temporary Auto Scaling group for evaluation. In both cases, the original instances remain untouched, maintaining 100%100\% capacity and enabling instant rollback by simply deleting the temporary resources.

Step-by-Step Solution

1
Analyze capacity requirements.
The strategy must maintain 100%100\% capacity during deployment, which rules out All at once and Rolling strategies.
Maintaining full capacity requires launching new instances before terminating old ones.
2
Analyze rollback constraints.
The rollback must be immediate and must not alter or affect the running production instances if the update fails. This rules out Rolling with additional batch, which updates active instances and requires a slow rolling rollback.
To prevent disruption, the original instances must remain untouched until the new version is verified.
3
Select the matching Elastic Beanstalk policies.
Immutable and Traffic Splitting satisfy both constraints as they launch new instances in a temporary group and only transition traffic once verified.
Both policies keep the original instances completely intact during evaluation and allow instant cleanup/rollback upon failure.

Key Concept

AWS Elastic Beanstalk deployment policies and their impact on environment capacity, duration, and rollback mechanisms.
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Topics

Deployment Strategies

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