Examkin

Question

Difficulty: MediumDeployment Strategies

An organization runs a critical web application on a fleet of Amazon EC2 instances managed by an Auto Scaling group. The developer needs to configure a deployment strategy for application updates that guarantees the application maintains 100% of its capacity throughout the deployment process. Additionally, if the new version fails health checks, the system must support the fastest possible rollback to the previous version with minimal operational overhead. The organization accepts the temporary additional cost of provisioning duplicate resources during the deployment.

Which two deployment strategies meet these requirements?

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

Answer

Blue/green deployment and Immutable deployment
Blue/green deployment and immutable deployment are the correct choices. Both strategies deploy the new version on new, separate resources while the original resources remain fully functional, ensuring 100% capacity is maintained. If a failure occurs, rollback is nearly instantaneous: traffic is directed back to the original instances (for blue/green) or the new resources are deleted (for immutable), requiring no redeployment overhead.

Step-by-Step Solution

1
Analyze capacity requirements.
The requirement specifies maintaining 100% capacity during deployment. This eliminates strategies that take existing instances offline, such as rolling deployment.
To ensure no performance degradation or downtime during the deployment.
2
Analyze rollback requirements.
The requirement specifies the fastest possible rollback. This eliminates strategies that require redeploying the old version in place, such as rolling with additional batch.
To minimize the mean time to recovery (MTTR) if a faulty version is deployed.
3
Evaluate remaining options against resource costs.
Both blue/green and immutable deployments deploy to new resources, maintaining 100% capacity of the old version and allowing instantaneous rollback (by switching DNS/routing or terminating new resources). Both meet the budget constraint because the organization accepts temporary duplicate resource costs.
To select the strategies that align with the cost profile and technical requirements.

Key Concept

Deployment strategies present different trade-offs among deployment time, capacity during deployment, rollback speed, and resource costs.
Rate this question

Topics

Deployment Strategies

More questions from this topic