Amazon Elastic Container Registry (ECR) is a fully-managed Docker container registry that facilitates the storage, management, and deployment of Docker container images, seamlessly integrating with Amazon Elastic Container Service (ECS) and Kubernetes (EKS). This integration simplifies workflows from development to production, secures access through IAM, and eliminates the need for personal container repositories. Pulumi Crosswalk for AWS enables developers to use infrastructure as code to build, publish, and pull from private ECR repositories efficiently. A practical example demonstrates the use of Pulumi to provision an ECR repository, build a custom Docker image, and deploy it to an ECS Fargate service. Lifecycle management features allow for the easy declaration of policies to manage stale images, reducing costs and ensuring that only necessary images are retained. Pulumi offers a streamlined process for maintaining Docker images in private ECR repositories, updating ECS or EKS services, and enforcing flexible policies, all through a simplified command structure.