Blue/Green Deployments to Amazon ECS using AWS CloudFormation and AWS CodeDeploy | Amazon Web Services
Briefly

Customers leveraging AWS CodeDeploy and CloudFormation for ECS deployments may face limitations in Blue/Green deployments. Some prefer CodeDeploy outside of CloudFormation for more control.
Utilizing CodeBuild and CodePipeline allows automation of CodeDeploy for Blue/Green ECS deployments, supporting both infrastructure and application changes in a single pipeline.
AWS provides guidance on using CloudFormation for ECS applications. For AWS CDK applications, a separate guide for Blue/Green deployments using CDK pipelines is recommended.
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