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Difficulty: EasyDeployment Strategies

A developer needs to update a web application running on AWS Elastic Beanstalk. The deployment must meet the following constraints:
- The application must have zero downtime during the update.
- The deployment must maintain 100% of the active instance capacity at all times.
- The update must be performed within the existing Elastic Beanstalk environment.

Which of the following Elastic Beanstalk deployment policies satisfy these constraints? (Select TWO.)

  1. Rolling with additional batchAnswer
  2. ImmutableAnswer
  3. C
    Rolling
  4. D
    All-at-once
  5. E
    Blue/Green

Answer

The Rolling with additional batch and Immutable deployment policies meet all the constraints.
The Rolling with additional batch policy launches a new batch of instances first to maintain the original capacity before rolling out the update to existing instances. The Immutable policy launches a temporary Auto Scaling group to deploy the new version alongside the existing group. Both methods ensure 100% of active instance capacity is maintained, have zero downtime, and operate within the existing environment.

Step-by-Step Solution

1
Evaluate the requirement for zero downtime and 100% capacity maintenance within a single Elastic Beanstalk environment.
The policies that do not temporarily reduce capacity (like Rolling) or take the entire environment offline (like All-at-once) must be selected.
This filters out All-at-once and Rolling.
2
Evaluate the requirement to perform the update within the existing Elastic Beanstalk environment.
The Blue/Green deployment method is ruled out because it requires launching a separate, new environment and swapping URLs.
This filters out Blue/Green.
3
Identify the remaining valid Elastic Beanstalk deployment policies.
Rolling with additional batch and Immutable deployment policies both maintain 100% capacity, ensure zero downtime, and run within the existing environment.
These policies fulfill all stated requirements.

Key Concept

AWS Elastic Beanstalk deployment policies and their impact on environment capacity, downtime, and cost.
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Topics

Deployment Strategies

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