All 7 AWS CodePipeline, CodeBuild & CodeDeploy (CI/CD) questions
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What are AWS CodePipeline, CodeBuild, and CodeDeploy, and how do they work together to form a CI/CD pipeline? What is a buildspec file in AWS CodeBuild, and what does it control? How do CodeDeploy lifecycle hooks defined in an appspec file control the deployment process? How does CodePipeline support manual approval stages, and why are they useful in a CI/CD process? How can CodeDeploy support canary deployments, and how does this differ from a standard blue green deployment? How can you design a multi account CI/CD pipeline using CodePipeline that deploys the exact same build to separate development, staging, and production AWS accounts?
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AWS › AWS CodePipeline, CodeBuild & CodeDeploy (CI/CD)

What deployment strategies does AWS CodeDeploy support, such as in place and blue green deployments?

Intermediate

Answer

CodeDeploy supports in place deployments, where the new application version is installed directly onto existing instances one batch at a time, briefly taking each batch out of service during the update, and blue green deployments, where an entirely new set of instances is provisioned with the new version, traffic is shifted over once the new environment is verified healthy, and the old instances are terminated afterward, offering safer rollback capability at the cost of temporarily running duplicate infrastructure.
aws deploy create-deployment --application-name my-app --deployment-group-name my-deployment-group --deployment-config-name CodeDeployDefault.AllAtOnce
Real-world example An online banking application uses blue green deployments through CodeDeploy for its critical transaction processing service, ensuring that if any issue is detected with the new version, traffic can be instantly shifted back to the still running old environment.

Common follow-ups: What is the difference between AllAtOnce, HalfAtATime, and OneAtATime deployment configurations?;How does CodeDeploy verify that a new deployment is healthy before proceeding?

Elastic Load Balancing (ALB NLB & CLB);Auto Scaling Groups
All 7 AWS CodePipeline, CodeBuild & CodeDeploy (CI/CD) questions