A company currently runs an on-premises application that uses ASP.NET on Linux machines. The application is resource-intensive and serves customers directly. The company wants to modernize the…

AWS App2Container helps containerize existing on-premises applications, generating container images and deployment artifacts. Deploying these containers to Amazon ECS with AWS Fargate provides a fully managed, serverless container platform that handles infrastructure provisioning and scaling, significantly reducing operational maintenance. Fargate natively integrates with Amazon CloudWatch for metrics-based scaling, perfectly meeting the requirements for a resource-intensive, customer-facing application with least operational overhead.

Deploying to Amazon EC2 Spot Instances is unsuitable for customer-facing applications that 'serve customers directly' and cannot be disrupted, as Spot Instances can be interrupted with short notice. Managing EC2 instances also entails more operational overhead than Fargate.

AWS App Runner is a great option for many web applications but does not explicitly 'containerize' an existing on-premises application in the same way App2Container does (it can build from source or Dockerfile). While it offers low operational overhead, for 'resource-intensive' applications coming from on-premises, ECS Fargate might offer more control and be a better fit, especially when paired with a migration tool like App2Container.

Amazon Lightsail is designed for simpler, fixed-price virtual private servers and is not typically used for highly scalable, resource-intensive containerized applications requiring robust CloudWatch-based scaling.