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AWS Certified Solutions Architect Professional SAP-C02 Practice Question

A media streaming company runs a latency-sensitive microservice on Amazon ECS (EC2 launch type) behind a public Application Load Balancer (prod-ALB). Deployments currently use the ECS rolling-update strategy, but new container images sometimes start slowly and create HTTP 502 errors during deployment.

The operations team wants to adopt a blue/green deployment strategy to increase operational excellence. Requirements are:

  • Deployments must be triggered automatically from AWS CodePipeline.
  • Engineers must be able to run integration tests against the new revision before any production traffic is shifted.
  • If ALB health checks or the integration tests fail, traffic must revert to the previous version without manual intervention.
  • DNS changes must not introduce additional propagation latency or caching issues.

Which solution meets these requirements with the LEAST operational overhead?

  • Provision a second ALB for the green environment and configure a CloudFront distribution origin to the green ALB. After testing, update the origin group to send all traffic to the green ALB and invalidate the CloudFront cache.

  • Use AWS CodeDeploy with the Amazon ECS blue/green deployment type. Create a second target group for prod-ALB, let CodeDeploy manage two task sets of the same ECS service, and add a CodeDeploy action in CodePipeline to shift the ALB listener between the blue and green target groups with automatic rollback on failures.

  • Retain the rolling-update strategy but set minimumHealthyPercent to 100 and maximumPercent to 200 in the ECS service. Trigger deployments from CodePipeline and rely on ALB slow-start to reduce 502 errors.

  • Create a duplicate ECS service for the green environment and register its tasks in a new target group. Use Amazon Route 53 weighted records to shift traffic in 10 percent increments from blue to green, then set the blue weight to 0 if tests pass.

AWS Certified Solutions Architect Professional SAP-C02
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