ECS vs EKS in 2026: The ECS Limits AWS Won't Raise, and When They Matter

ECS remains a suitable platform for many teams, but the article argues that growth can expose fixed AWS limits and operational trade-offs, especially for pull-request preview environments. Its main example is the nonadjustable limit of 100 target groups per Application Load Balancer, which can restrict teams with four or five exposed services per preview to roughly 20 previews per ALB, while ECS also has fixed limits on containers per task definition, target groups per service, task counts, and certain Fargate launch rates. Fargate’s lack of daemon scheduling and GPU support means monitoring, logging, and security agents often run as sidecars, while software distributed as Helm charts must be manually adapted for ECS. The article also compares Fargate’s steady-state costs and cold-start behavior with EC2-backed Kubernetes, suggesting Fargate can be more expensive for continuously running workloads but remains useful for bursty or scale-to-zero services. Rather than requiring a full migration, it recommends a hybrid approach in which production remains on ECS while EKS hosts preview environments, using Kubernetes namespaces and shared ingress infrastructure to simplify environment lifecycle management; it presents Qovery as a managed platform for implementing this approach and potentially migrating production later.

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