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Zorluk: OrtaDeployment Strategies

A company runs a high-traffic web application on an AWS Elastic Beanstalk environment. The application is highly sensitive to performance degradation, so the deployment of a new version must maintain 100% of the environment's instance capacity to handle traffic at all times. Additionally, if the new version fails health checks, the environment must roll back automatically with minimal rollback time and no manual intervention. The developer wants to avoid configuring a secondary environment or changing DNS records. Which deployment strategy should the developer select to meet these requirements?

  1. A
    Rolling with additional batch deployment
  2. B
    Rolling deployment
  3. Immutable deploymentCevap
  4. D
    All at once deployment

Cevap

Immutable deployment
The correct strategy is an Immutable deployment. This policy launches a temporary Auto Scaling group with the new application version and tests it. If the instances pass health checks, Elastic Beanstalk moves them to the main Auto Scaling group and terminates the old instances. If they fail, the temporary Auto Scaling group is terminated immediately, achieving a clean and fast rollback without modifying any of the original instances and maintaining 100% capacity throughout the process.

Adım Adım Çözüm

1
Analyze the capacity requirement.
The requirement specifies that the deployment must maintain 100% of the environment's instance capacity. This rules out 'All at once' and 'Rolling' deployments, as they temporarily take instances out of service.
To prevent performance degradation during the deployment process.
2
Analyze the environment and DNS requirements.
The deployment must occur within the existing environment without creating a secondary environment or changing DNS records (CNAME swap), which rules out external Blue/Green deployments.
To simplify management and satisfy the single-environment constraint.
3
Evaluate the rollback and failure recovery requirements.
The strategy must support automatic rollback with minimal recovery time if health checks fail. An immutable deployment creates a temporary Auto Scaling group to test the new version, making rollbacks as simple as terminating the temporary group. A rolling with additional batch deployment would require a slow, manual rollback deployment of the previous version if some instances had already been updated.
To find the strategy that minimizes the blast radius and rollback time within a single environment.

Anahtar Kavram

AWS Elastic Beanstalk deployment policies and their trade-offs regarding capacity, downtime, and rollback mechanisms.
Tahmini Süre:1m 30s
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Deployment Strategies

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