ECS vs Cloud Run vs Azure Container Apps

Amazon ECS, Google Cloud Run, and Azure Container Apps are managed container platforms from the three major cloud providers. Cloud Run and Azure Container Apps are fully serverless with scale-to-zero. ECS is more traditional but offers deeper infrastructure control.

Serverless Container Comparison

Google Cloud Run

Cloud Run is the gold standard for serverless containers. Deploy a container image, and Cloud Run handles scaling, HTTPS, custom domains, and traffic splitting automatically. It scales to zero when idle (you pay nothing) and scales up to thousands of instances under load. Each instance can handle up to 1,000 concurrent requests.

Azure Container Apps

Azure Container Apps is built on Kubernetes (AKS) and Dapr, but abstracts away the complexity. It offers scale-to-zero, KEDA-based autoscaling with custom scale triggers, built-in Dapr integration for microservices patterns, and revision-based traffic splitting. It sits between Azure App Service (PaaS) and AKS (full K8s).

Amazon ECS

ECS with Fargate is serverless in the sense that you don't manage servers, but it does not scale to zero — you always pay for at least one running task. ECS offers more control over networking (VPC, security groups, service discovery) and higher resource limits (16 vCPU, 120 GB RAM) than Cloud Run or Container Apps.

When Scale-to-Zero Matters

For development environments, staging, and low-traffic services, scale-to-zero can save significant money. Cloud Run and Azure Container Apps excel here. For production services with consistent traffic, the always-running ECS model is fine since you would never scale to zero anyway.

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