Migrating Microservices to AWS Fargate or EKS: How to Compare Cost, Complexity, and Who Runs It

For large microservices migrations to AWS, the central choice is often less about Fargate versus EKS than about who will operate the resulting platform over time. EKS on EC2 generally offers greater control, support for DaemonSets, GPUs, custom networking, bin-packing, Spot capacity, and Savings Plans, making it more economical for dense, steady workloads, while Fargate reduces node-management work and can suit bursty, isolated, or small-team workloads but has higher per-pod pricing and feature limitations. Many organizations use a mixed EKS model, placing baseline services on EC2 node groups and bursty or tenant-isolated workloads on Fargate. Migration requires separate tools for discovery, packaging, data transfer, cluster-state restoration, and incremental traffic cutovers, including AWS Migration Hub, App2Container, Velero, AWS DMS, DataSync, and routing options such as Istio, App Mesh, load balancers, or Route 53. The discussion distinguishes supporting tools such as policy engines and API-deprecation scanners from actual migration tools, and recommends phased, rollback-capable migrations that move low-risk stateless services before stateful systems. It also compares post-migration platform options, including OpenShift, Cloud Foundry/Korifi, internally built Kubernetes platforms, and Qovery, emphasizing that upgrades, IAM, networking, observability, CI/CD, cost controls, and non-production environment sprawl can require a dedicated platform team or managed-service subscription long after the initial migration ends.

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