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Difficulty: EasyDeployment Strategies

A developer is planning to update a non-critical internal application deployed on AWS Elastic Beanstalk. The update will be performed during off-peak hours over the weekend. To stay within budget, the deployment must not provision any additional EC2 instances. The company accepts that the application will be temporarily offline during the deployment process.

Which deployment strategy meets these requirements?

  1. A
    Rolling with additional batch
  2. B
    Immutable
  3. All at onceAnswer
  4. D
    Traffic splitting

Answer

All at once
The 'All at once' strategy is the only Elastic Beanstalk deployment policy that does not provision any additional EC2 instances during the update. It applies the deployment package to all existing instances at the same time. While this causes a short period of downtime (unavailability) during which the application is offline, this aligns with the company's acceptance of weekend downtime and satisfies the strict budget constraint of zero additional instances.

Step-by-Step Solution

1
Analyze the scenario constraints.
The deployment must not provision any additional EC2 instances (minimal cost) and can tolerate downtime (offline during the weekend).
This establishes the boundaries for acceptable deployment strategies.
2
Evaluate the resource provisioning behavior of each strategy.
Rolling with additional batch, Immutable, and Traffic splitting all require provisioning new instances during the deployment. Only the All at once strategy deploys directly to existing instances without launching new ones.
This filters out strategies that violate the zero-additional-instance cost constraint.
3
Select the strategy that allows downtime and uses only existing instances.
The All at once strategy is selected as it updates all instances simultaneously, causing downtime but requiring no additional resource costs.
This matches all criteria described in the scenario.

Key Concept

AWS Elastic Beanstalk deployment strategy tradeoffs regarding cost and capacity.
Estimated Time:45s
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Topics

Deployment Strategies

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