Kubernetes vs ECS Fargate vs AWS App Runner — UK Container Orchestration (2025)

Updated: November 20259 min read
🇬🇧 UK💷 GBP📊 Comparison🔒 UK GDPR⚖️ UK Law

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.

FactorECS FargateKubernetes (EKS)AWS App Runner
Cyber Essentials OS patching✅ AWS manages — no obligationEKS nodes: AWS manages (managed node group) or you manage✅ AWS manages — no obligation
FCA PS21/3 multi-AZ✅ Multi-AZ in one config lineMulti-AZ requires pod disruption budgets, zone-aware topology✅ Automatic — no config needed
NHS DTAC security posture✅ Simple — fewer attack surfacesComplex — RBAC, NetworkPolicies, PSP✅ Simplest — fully managed
Operational complexityLowHigh — dedicated platform team needed✅ Zero — fully managed
Multi-cloud portabilityAWS-native only✅ Portable to any K8s providerAWS-only
Custom resource typesNo✅ Custom Resource Definitions (CRDs)No
Cost (medium workload)Medium — task hours billedHigher — EKS control plane £130/month + nodes✅ Lowest — pay per request/CPU
UK developer familiarity✅ High — common on AWS projectsHigh — popular but complexGrowing
ClickMasters default✅ All UK regulated projectsMulti-cloud or complex orchestration onlySimple web APIs — no persistence

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