Kubernetes vs ECS Fargate vs AWS App Runner — UK Container Orchestration (2025)
ECS Fargate is the right default for most UK regulated software: no Kubernetes operational overhead, Cyber Essentials-friendly (AWS manages OS patching), FCA PS21/3 multi-AZ with zero additional configuration, and NHS DTAC-friendly (simpler security posture). Kubernetes (EKS) is right when you need multi-cloud portability or the team has existing Kubernetes expertise. App Runner is right for simple web APIs where you want zero infrastructure configuration. Container orchestration choice affects UK Cyber Essentials patching obligations, FCA PS21/3 operational resilience configuration complexity, and monthly infrastructure cost.
| Factor | ECS Fargate | Kubernetes (EKS) | AWS App Runner |
|---|---|---|---|
| Cyber Essentials OS patching | ✅ AWS manages — no obligation | EKS nodes: AWS manages (managed node group) or you manage | ✅ AWS manages — no obligation |
| FCA PS21/3 multi-AZ | ✅ Multi-AZ in one config line | Multi-AZ requires pod disruption budgets, zone-aware topology | ✅ Automatic — no config needed |
| NHS DTAC security posture | ✅ Simple — fewer attack surfaces | Complex — RBAC, NetworkPolicies, PSP | ✅ Simplest — fully managed |
| Operational complexity | Low | High — dedicated platform team needed | ✅ Zero — fully managed |
| Multi-cloud portability | AWS-native only | ✅ Portable to any K8s provider | AWS-only |
| Custom resource types | No | ✅ Custom Resource Definitions (CRDs) | No |
| Cost (medium workload) | Medium — task hours billed | Higher — EKS control plane £130/month + nodes | ✅ Lowest — pay per request/CPU |
| UK developer familiarity | ✅ High — common on AWS projects | High — popular but complex | Growing |
| ClickMasters default | ✅ All UK regulated projects | Multi-cloud or complex orchestration only | Simple web APIs — no persistence |
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