What is the AWS managed container image registry service that is secure, scalable, and reliable?

The AWS managed container image registry service that is secure, scalable, and reliable is Amazon Elastic Container Registry (ECR). ECR enables you to store, manage, and deploy Docker container images. Being a fully managed service, it eliminates the need to operate your own container repositories, simplifying the process of container management.

Amazon ECR is designed with security features such as integrated IAM policies for fine-grained access control, making it suitable for private registries. It supports image lifecycle policies, allowing efficient management and cleanup of images, which enhances its scalability. ECR also seamlessly integrates with other AWS services and developer tools, facilitating CI/CD workflows.

In contrast, the other options listed serve different purposes within the AWS ecosystem. Amazon Elastic Container Service (ECS) is a container orchestration service that allows you to run and manage containerized applications, while Amazon Elastic Kubernetes Service (EKS) provides a managed Kubernetes platform. Amazon Fargate, on the other hand, is a serverless compute engine for containers that fits with ECS and EKS by allowing you to run containers without managing the underlying servers. Each of these services complements ECR but does not provide the specific function of managing container images.