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Difficulty: MediumDeployment Strategies

A developer is updating a critical serverless application and needs to configure traffic shifting for a new version of an AWS Lambda function using AWS CodeDeploy. The deployment must meet the following requirements:

* Route exactly 10%10\% of traffic to the new version in the first increment.
* Allow at least 1010 minutes of monitoring for errors before shifting any additional traffic or completing the deployment.

Which two AWS CodeDeploy deployment configurations should the developer select to meet these requirements?

  1. A
    CodeDeployDefault.LambdaCanary10Percent5Minutes
  2. CodeDeployDefault.LambdaCanary10Percent10MinutesAnswer
  3. C
    CodeDeployDefault.LambdaLinear10PercentEvery1Minute
  4. CodeDeployDefault.LambdaLinear10PercentEvery10MinutesAnswer
  5. E
    CodeDeployDefault.LambdaAllAtOnce

Answer

The correct configurations are CodeDeployDefault.LambdaCanary10Percent10Minutes and CodeDeployDefault.LambdaLinear10PercentEvery10Minutes.
The configurations CodeDeployDefault.LambdaCanary10Percent10Minutes and CodeDeployDefault.LambdaLinear10PercentEvery10Minutes both satisfy the requirements. The canary configuration shifts 10%10\% of the traffic to the new version initially and waits 1010 minutes before shifting the remaining 90%90\%. The linear configuration shifts 10%10\% initially and waits 1010 minutes before shifting the next 10%10\% increment, which allows the required 1010 minutes of monitoring in both cases.

Step-by-Step Solution

1
Analyze the requirement for initial traffic allocation.
The configuration must shift exactly 10%10\% of the traffic in the first increment. This rules out CodeDeployDefault.LambdaAllAtOnce, which shifts 100%100\% immediately.
Identifying the initial increment size helps narrow down the candidates to Canary 10%10\% and Linear 10%10\% configurations.
2
Evaluate the monitoring window constraint of at least 1010 minutes before shifting more traffic.
CodeDeployDefault.LambdaCanary10Percent5Minutes shifts the remaining traffic after 55 minutes, and CodeDeployDefault.LambdaLinear10PercentEvery1Minute shifts more traffic after 11 minute. Both fail the 1010-minute threshold.
Eliminating configurations that shift traffic too quickly ensures the deployment meets the safety window constraint.
3
Confirm the configurations that meet both constraints.
CodeDeployDefault.LambdaCanary10Percent10Minutes (shifts 10%10\% and waits 1010 minutes) and CodeDeployDefault.LambdaLinear10PercentEvery10Minutes (shifts 10%10\% and waits 1010 minutes before each subsequent shift) both satisfy the requirements.
Both configurations guarantee a 10%10\% initial traffic split and a minimum of 1010 minutes of evaluation time before further traffic modification.

Key Concept

AWS CodeDeploy deployment configurations for AWS Lambda functions specify how traffic is shifted between the original and new versions. Canary configurations shift a specified percentage in one increment and then shift the rest after a delay. Linear configurations shift traffic in equal increments at regular intervals.
Estimated Time:1m 30s
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Deployment Strategies

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