アーキテクチャ比較：NGINXのみ vs NGINX + APIゲートウェイ

Overview This document compares two common microservice architecture patterns to help you decide which approach best fits your use case. Architecture Diagrams Option 1 — NGINX Only Client ↓ NGINX ↓ Microservices Option 2 — NGINX + API Gateway Client ↓ NGINX ↓ API Gateway ↓ Microservices Comparison by Category 1. Complexity Aspect NGINX Only NGINX + API Gateway Infrastructure Simpler More complex Number of services Fewer Additional gateway service Configuration Easier More layers Debugging Easier Harder Maintenance Lower Higher Winner: ✅ NGINX Only 2. Performance Aspect NGINX Only NGINX + API Gateway Request hops Fewer More Latency Lower Slightly higher Resource usage Lower Higher Throughput Better Slightly lower Winner: ✅ NGINX Only 3. Routing Feature NGINX Only API Gateway Path routing ✅ ✅ Load balancing ✅ ✅ Header-based routing Limited Better Dynamic routing Limited Better Service discovery Manual Better Canary deployment Harder Easier Winner: ✅ API Gateway 4. Security Feature NGINX Only API Gateway SSL termination ✅ Usually via NGINX JWT validation In every service Centralized RBAC In services Easier centralized OAuth2 integration Harder Easier API key management Limited Better Threat protection Limited Better Winner: ✅ API Gateway Note: If your services already validate JWT, security is already strong — the advantage of an API Gateway in this area may be less significant. 5. Scalability Aspect NGINX Only NGINX + API Gateway Horizontal scaling ✅ ✅ Docker scaling ✅ ✅ Kubernetes readiness Moderate Better Service mesh integration Harder Easier Dynamic service registration Manual Easier Winner: ✅ API Gateway (large scale) 6. Observability & Monitoring Feature NGINX Only API Gateway Access logging ✅ ✅ Distributed tracing Harder Easier Request correlation Manual Better Centralized metrics Limited Better OpenTelemetry integration Harder Easier Winner: ✅ API Gateway 7. Rate Limiting Feature NGINX Only API Gateway Basic rate limit ✅ ✅ Per-user limit Harder Easier Per-role limit Harder Easier API quota Limited Better Winner: ✅ API Gateway 8. Development Speed Aspect NGINX Only NGINX + API Gateway Faster setup ✅ ❌ Easier onboarding ✅ ❌ Easier deployment ✅ ❌ Less code ✅ ❌ Winner: ✅ NGINX Only 9. Cost & Resource Usage Aspect NGINX Only NGINX + API Gateway RAM usage Lower Higher CPU usage Lower Higher Container count Lower Higher Operational cost Lower Higher Winner: ✅ NGINX Only 10. Enterprise Features Feature NGINX Only API Gateway Circuit breaker Limited Better API aggregation Harder Easier Request transformation Limited Better GraphQL federation Harder Easier Multi-tenant gateway policies Harder Easier Backend-for-Frontend (BFF) Harder Easier Winner: ✅ API Gateway Summary Scorecard Category Winner Complexity ✅ NGINX Only Performance ✅ NGINX Only Routing ✅ API Gateway Security ✅ API Gateway Scalability ✅ API Gateway Observability & Monitoring ✅ API Gateway Rate Limiting ✅ API Gateway Development Speed ✅ NGINX Only Cost & Resource Usage ✅ NGINX Only Enterprise Features ✅ API Gateway NGINX Only wins: 4/10 API Gateway wins: 6/10 Recommendation Choose NGINX Only if you prioritize simplicity, lower resource usage, fast setup, and your current JWT validation per-service is already sufficient for your security needs. Choose NGINX + API Gateway if you need advanced routing, centralized security, better observability, rate limiting per user/role, and enterprise-grade features — especially at large scale or in Kubernetes environments. Overview This document compares two common microservice architecture patterns to help you decide which approach best fits your use case. Architecture Diagrams Option 1 — NGINX Only Client ↓ NGINX ↓ Microservices Option 2 — NGINX + API Gateway Client ↓ NGINX ↓ API Gateway ↓ Microservices Comparison by Category 1. Complexity Aspect NGINX Only NGINX + API Gateway Infrastructure Simpler More complex Number of services Fewer Additional gateway service Configuration Easier More layers Debugging Easier Harder Maintenance Lower Higher Winner: ✅ NGINX Only 2. Performance Aspect NGINX Only NGINX + API Gateway Request hops Fewer More Latency Lower Slightly higher Resource usage Lower Higher Throughput Better Slightly lower Winner: ✅ NGINX Only 3. Routing Feature NGINX Only API Gateway Path routing ✅ ✅ Load balancing ✅ ✅ Header-based routing Limited Better Dynamic routing Limited Better Service discovery Manual Better Canary deployment Harder Easier Winner: ✅ API Gateway 4. Security Feature NGINX Only API Gateway SSL termination ✅ Usually via NGINX JWT validation In every service Centralized RBAC In services Easier centralized OAuth2 integration Harder Easier API key management Limited Better Threat protection Limited Better Winner: ✅ API Gateway Note: If your services already validate JWT, security is already strong — the advantage of an API Gateway in this area may be less significant. 5. Scalability Aspect NGINX Only NGINX + API Gateway Horizontal scaling ✅ ✅ Docker scaling ✅ ✅ Kubernetes readiness Moderate Better Service mesh integration Harder Easier Dynamic service registration Manual Easier Winner: ✅ API Gateway (large scale) 6. Observability & Monitoring Feature NGINX Only API Gateway Access logging ✅ ✅ Distributed tracing Harder Easier Request correlation Manual Better Centralized metrics Limited Better OpenTelemetry integration Harder Easier Winner: ✅ API Gateway 7. Rate Limiting Feature NGINX Only API Gateway Basic rate limit ✅ ✅ Per-user limit Harder Easier Per-role limit Harder Easier API quota Limited Better Winner: ✅ API Gateway 8. Development Speed Aspect NGINX Only NGINX + API Gateway Faster setup ✅ ❌ Easier onboarding ✅ ❌ Easier deployment ✅ ❌ Less code ✅ ❌ Winner: ✅ NGINX Only 9. Cost & Resource Usage Aspect NGINX Only NGINX + API Gateway RAM usage Lower Higher CPU usage Lower Higher Container count Lower Higher Operational cost Lower Higher Winner: ✅ NGINX Only 10. Enterprise Features Feature NGINX Only API Gateway Circuit breaker Limited Better API aggregation Harder Easier Request transformation Limited Better GraphQL federation Harder Easier Multi-tenant gateway policies Harder Easier Backend-for-Frontend (BFF) Harder Easier Winner: ✅ API Gateway Summary Scorecard Category Winner Complexity ✅ NGINX Only Performance ✅ NGINX Only Routing ✅ API Gateway Security ✅ API Gateway Scalability ✅ API Gateway Observability & Monitoring ✅ API Gateway Rate Limiting ✅ API Gateway Development Speed ✅ NGINX Only Cost & Resource Usage ✅ NGINX Only Enterprise Features ✅ API Gateway NGINX Only wins: 4/10 API Gateway wins: 6/10 Recommendation Choose NGINX Only if you prioritize simplicity, lower resource usage, fast setup, and your current JWT validation per-service is already sufficient for your security needs. Choose NGINX + API Gateway if you need advanced routing, centralized security, better observability, rate limiting per user/role, and enterprise-grade features — especially at large scale or in Kubernetes environments.