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Difficulty: HardDeployment Strategies

A developer is updating a critical serverless backend API hosted on AWS Lambda by configuring traffic shifting using AWS SAM and AWS CodeDeploy. The deployment must adhere to the following requirements:

1. Traffic must be routed to the new version in a linear, step-by-step progression rather than a single large step-up after an initial canary window.
2. The entire deployment must complete, routing 100% of traffic to the new version, in less than 15 minutes.
3. The deployment must automatically roll back if a CloudWatch alarm is triggered.

Which CodeDeploy deployment configuration should the developer specify in the SAM template's DeploymentPreference section to satisfy these requirements?

  1. A
    Canary10Percent10Minutes
  2. B
    Linear10PercentEvery2Minutes
  3. Linear10PercentEvery1MinuteAnswer
  4. D
    AllAtOnce

Answer

Linear10PercentEvery1Minute
The configuration that increments traffic by 10% every minute is the only option that is linear (providing a step-by-step progression rather than a sudden shift) and completes the deployment within the 15-minute constraint, taking 9 minutes in total.

Step-by-Step Solution

1
Analyze the requirement for linear, step-by-step progression.
This rules out Canary deployment configurations (like Canary10Percent10Minutes) and AllAtOnce configurations, leaving only Linear options.
Linear configurations shift traffic incrementally over multiple steps, whereas Canary shifts a small percentage, waits, and then shifts the remainder all at once.
2
Calculate the total deployment duration for the remaining Linear options.
Linear10PercentEvery1Minute takes 9 minutes (9 intervals of 1 minute) to complete. Linear10PercentEvery2Minutes takes 18 minutes (9 intervals of 2 minutes) to complete.
The total duration of a Linear10PercentEveryXMinutes configuration is 9 * X minutes, since it starts at 10% and increments by 10% each interval until it reaches 100%.
3
Compare the durations against the maximum completion limit of 15 minutes.
Only Linear10PercentEvery1Minute (9 minutes) is under the 15-minute threshold.
Linear10PercentEvery2Minutes requires 18 minutes, which violates the SLA requirement of completing in less than 15 minutes.

Key Concept

AWS CodeDeploy built-in deployment configurations for AWS Lambda and SAM allow developers to choose between linear and canary traffic shifting. Calculating the total deployment duration (number of steps multiplied by the interval) is critical to meeting deployment time SLAs.
Estimated Time:2m 0s
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Topics

Deployment Strategies

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