AWS DevOps Engineer Professional Practice Test

What deployment strategies are supported by AWS CodeDeploy for EC2 and on-premise instances?

1. CodeDeployDefault.AllAtOnce and CodeDeployDefault.OneByOne

2. CodeDeployDefault.HalfAtATime and CodeDeployDefault.AllAtOnce

3. CodeDeployDefault.AllAtOnce, CodeDeployDefault.HalfAtATime, CodeDeployDefault.OneAtATime

4. Only CodeDeployDefault.HalfAtATime is supported

The correct answer is: CodeDeployDefault.AllAtOnce, CodeDeployDefault.HalfAtATime, CodeDeployDefault.OneAtATime

The correct answer highlights the various deployment strategies supported by AWS CodeDeploy for EC2 and on-premise instances. CodeDeploy offers three primary deployment configurations that optimize application availability and minimize deployment risks. The AllAtOnce strategy deploys the application to all specified instances simultaneously. This is a suitable choice when the application can handle sudden traffic and there is minimal risk associated with the deployment. The HalfAtATime strategy divides the deployment target into two groups and deploys to half of them at once before proceeding with the other half. This approach strikes a balance between speed and risk management, allowing for immediate rollback if issues are detected in the first half. The OneAtATime strategy deploys the application to one instance at a time. This strategy is the most cautious and is particularly useful for critical applications where stability is paramount and where each step can be monitored closely. Understanding these strategies is crucial in choosing the best approach for different deployment scenarios, ensuring a smooth transition while maintaining application performance and reliability.