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Difficulty: EasyDeployment Strategies

A company is evaluating AWS deployment strategies for its web application to ensure that any new version is deployed to brand new instances rather than updating the existing instances in-place. This approach is required to allow a clean separation of environments and a rapid rollback if issues are detected in production. Which two deployment strategies satisfy these requirements? (Select TWO.)

  1. Blue/green deploymentAnswer
  2. Immutable deploymentAnswer
  3. C
    Rolling deployment
  4. D
    All-at-once deployment
  5. E
    In-place deployment

Answer

The correct strategies are blue/green deployment and immutable deployment, as both strategies provision entirely new instances for the new application version rather than updating existing instances in-place.
Blue/green deployment and immutable deployment are designed to launch new instances for the new deployment version. Blue/green deployment creates a duplicate environment where the new version is tested before shifting traffic. Immutable deployment replaces the existing instances with new ones by launching a temporary Auto Scaling group, verifying the instances, and terminating the old ones. Both strategies preserve the original instances unchanged during the initial deployment phase, allowing for a fast and clean rollback.

Step-by-Step Solution

1
Analyze the scenario constraints and requirements.
The target strategy must deploy the application to brand new instances and avoid in-place updates to facilitate a clean separation and quick rollback.
This allows filtering out any deployment strategies that update existing instances directly.
2
Evaluate the deployment strategies against the requirement of using new instances.
Blue/green deployment creates a separate parallel environment of new instances. Immutable deployment provisions new instances in a separate Auto Scaling group or environment before terminating the old ones.
Both methods fulfill the core requirement of using new instances to avoid configuration drift and allow rapid rollback.
3
Identify why other options fail.
Rolling, all-at-once, and in-place updates deploy code directly onto the existing virtual machines, meaning they update the instances in-place.
This confirms that only blue/green and immutable deployments meet all constraints.

Key Concept

Identifying deployment strategies that utilize new instances (immutable and blue/green) versus those that update existing instances in-place (rolling and all-at-once).
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Topics

Deployment Strategies

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