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Difficulty: EasyDeployment Strategies

A developer is selecting deployment strategies for a production web application. The application has two strict requirements: there must be zero downtime during the deployment process, and the application must be able to roll back to the previous version immediately if a failure is detected. Which of the following deployment strategies satisfy both of these requirements? (Select TWO.)

  1. Blue/Green deploymentAnswer
  2. Canary deploymentAnswer
  3. C
    All-at-once deployment
  4. D
    Rolling deployment
  5. E
    In-place deployment

Answer

Blue/Green deployment and Canary deployment satisfy the requirements because they both allow traffic to be shifted between environments or versions with zero downtime, and can immediately route traffic back to the stable version if a failure occurs.
The correct strategies are Blue/Green deployment and Canary deployment. In a Blue/Green deployment, a separate environment is created, and traffic is cut over, allowing an immediate rollback by shifting traffic back if an error occurs. In a Canary deployment, traffic is shifted incrementally, and if alarms fire, traffic is immediately routed back to the old version. Both methods guarantee zero downtime and immediate rollback.

Step-by-Step Solution

1
Identify the downtime requirements of the candidate deployment strategies.
Blue/Green and Canary strategies support zero downtime by keeping both versions of the application active. All-at-once and standard In-place strategies incur downtime.
To filter out strategies that cause application offline states.
2
Analyze the rollback capabilities of the remaining strategies.
Blue/Green and Canary strategies can roll back immediately by shifting traffic back to the original version. Rolling and All-at-once strategies require a redeployment of the previous version to roll back.
To identify which strategies meet the immediate rollback constraint.

Key Concept

Downtime and rollback trade-offs of AWS deployment strategies.
Estimated Time:45s
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Topics

Deployment Strategies

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