Examkin

Question

Difficulty: MediumDeployment Strategies

A developer is configuring the deployment policy for a high-traffic web application hosted on AWS Elastic Beanstalk. The application runs on multiple Amazon EC2 instances. The deployment policy must satisfy the following requirements:

1. The application must maintain 100%100\% of its instance capacity to handle incoming traffic at all times during the deployment.
2. If a deployment failure occurs, the rollback process must be rapid and must not perform any updates or modifications on the original, healthy instances.

Which two deployment strategies should the developer select to meet these requirements?

  1. ImmutableAnswer
  2. Traffic splittingAnswer
  3. C
    All-at-once
  4. D
    Rolling
  5. E
    Rolling with additional batch

Answer

The correct strategies are Immutable and Traffic splitting.
The correct strategies are Immutable and Traffic splitting. Both of these strategies maintain 100%100\% instance capacity during deployment by launching a separate, temporary Auto Scaling group for the new version. Furthermore, if a deployment failure occurs, the rollback is rapid and clean because it only requires terminating the temporary Auto Scaling group and redirecting traffic, leaving the original, healthy instances completely untouched.

Step-by-Step Solution

1
Analyze capacity requirements during deployment.
To maintain 100%100\% capacity without reducing instance count, any strategy that takes existing instances offline (All-at-once, Rolling) is eliminated. Strategies that launch new instances (Rolling with additional batch, Immutable, Traffic splitting) are kept.
Eliminating options that reduce capacity ensures the application can handle peak traffic during the update.
2
Analyze rollback requirements in case of failure.
Rolling with additional batch modifies the existing instances. If it fails, rolling back requires redeploying the old version back onto the instances, which takes time and modifies active instances. Immutable and Traffic splitting launch a separate, temporary Auto Scaling group. If they fail, they immediately redirect traffic and terminate the temporary resources, leaving the original instances untouched.
This identifies the strategies that provide the fastest and cleanest rollback without performing out-of-band updates on original instances.

Key Concept

AWS Elastic Beanstalk deployment policies and their impact on capacity, rollback speed, and resource modification.
Rate this question

Topics

Deployment Strategies

More questions from this topic