Which strategy will meet these requirements?
Add a stage to the CodePipeline pipeline between the source and deploy stages. Use AWS CodeBuild to create an execution environment and build commands in the buildspec file to invoke test scripts. If errors are found, use the aws deploy stop-deployment command to stop the deployment.
Add a stage to the CodePipeline pipeline between the source and deploy stages. Use this stage to execute an AWS Lambda function that will run the test scripts. If errors are found, use the aws deploy stop-deployment command to stop the deployment.
Add a hooks section to the CodeDeploy AppSpec file. Use the AfterAllowTestTraffic lifecycle event to invoke an AWS Lambda function to run the test scripts. If errors are found, exit the Lambda function with an error to trigger rollback.
Add a hooks section to the CodeDeploy AppSpec file. Use the AfterAllowTraffic lifecycle event to invoke the test scripts. If errors are found, use the aws deploy stop-deployment CLI command to stop the deployment.
Explanations:
While adding a stage with AWS CodeBuild can run tests before deployment, it does not align with the blue/green deployment model, as it tests the code before deploying it, which may not ensure the new version is actually tested in a production-like environment. Also, usingaws deploy stop-deploymentwould be ineffective at this stage, as the deployment has not yet started.
Similar to Option A, running tests in a separate stage with AWS Lambda would test the code before deployment, not the deployed green version. This does not leverage the blue/green deployment capabilities effectively, as the tests would not validate the new version in the context of its environment.
This approach correctly utilizes the blue/green deployment model by invoking the test scripts after the traffic has been allowed to the green version. If errors are found, exiting the Lambda function with an error will trigger the rollback process automatically, ensuring that the deployment is reverted if issues arise.
Using the AfterAllowTraffic lifecycle event means that tests are run after traffic has already been shifted to the green version. If errors are found, theaws deploy stop-deploymentcommand cannot be used here because it only works prior to the traffic shift, making it ineffective for rollback after traffic has been allowed.