{"id":48839,"date":"2025-03-19T08:04:10","date_gmt":"2025-03-19T08:04:10","guid":{"rendered":"https:\/\/www.devopsschool.com\/blog\/?p=48839"},"modified":"2025-03-19T09:21:55","modified_gmt":"2025-03-19T09:21:55","slug":"comprehensive-comparison-kubernetes-ingress-vs-kubernetes-gateway-api","status":"publish","type":"post","link":"https:\/\/www.devopsschool.com\/blog\/comprehensive-comparison-kubernetes-ingress-vs-kubernetes-gateway-api\/","title":{"rendered":"Kubernetes Tutorials: Comparison: Kubernetes Ingress vs. Kubernetes Gateway API"},"content":{"rendered":"\n

Here’s a clear, detailed, and comprehensive comparison of Kubernetes Ingress (Legacy)<\/strong> vs. Kubernetes Gateway API (Modern)<\/strong>, covering all key aspects clearly and practically:<\/p>\n\n\n\n

\n\n\n\n
Feature \/ Parameter<\/strong><\/th>\ud83d\udfe1 Ingress (Legacy)<\/strong><\/th>\ud83d\udd35 Gateway API (Modern)<\/strong><\/th><\/tr><\/thead>
Purpose & Definition<\/strong><\/td>Basic HTTP\/HTTPS routing to services within a Kubernetes cluster.<\/td>Advanced, standardized routing for multiple protocols (HTTP, HTTPS, TCP, UDP, gRPC) with explicit APIs and role separation.<\/td><\/tr>
Protocol Support<\/strong><\/td>HTTP\/HTTPS only. Limited multi-protocol via annotations.<\/td>Comprehensive: HTTP, HTTPS, TCP, UDP, TLS, gRPC, and more explicitly defined.<\/td><\/tr>
Configuration Method<\/strong><\/td>YAML with basic rules. Complex features via annotations (vendor-specific).<\/td>Explicit YAML definitions with clear separation (Gateway, HTTPRoute, TCPRoute, etc.).<\/td><\/tr>
Standardization<\/strong><\/td>Partial. Vendor-specific annotations heavily used.<\/td>Strong, clearly defined Kubernetes-standard API specification (Cloud\/vendor neutral).<\/td><\/tr>
Routing Capabilities<\/strong><\/td>Basic hostname\/path routing. Limited advanced routing via annotations.<\/td>Advanced routing including header-based, weighted, hostname-based, path-based, method-based, and query-based rules explicitly defined.<\/td><\/tr>
Role-Based Access Control (RBAC)<\/strong><\/td>Limited. Single resource (Ingress) managed by one team typically.<\/td>Explicit multi-role model (Gateway managed by Ops; Routes managed by Developers), clearly supporting multi-team scenarios.<\/td><\/tr>
Multi-tenant Support<\/strong><\/td>Limited and cumbersome.<\/td>Native multi-tenant support with clear RBAC and explicit cross-namespace controls via ReferenceGrant.<\/td><\/tr>
TLS and mTLS<\/strong><\/td>TLS termination via annotations or secrets. Limited mTLS (not native).<\/td>Explicit TLS termination and passthrough modes clearly defined. Easier extension for mTLS via controllers (e.g., Istio).<\/td><\/tr>
Cross-Namespace References<\/strong><\/td>Difficult (manual annotations, not explicit).<\/td>Easy and explicit via ReferenceGrant.<\/td><\/tr>
Extensibility<\/strong><\/td>Low, annotations-based extensions.<\/td>Highly extensible by design through explicit APIs, controllers, and policy attachments.<\/td><\/tr>
API Complexity<\/strong><\/td>Simpler but limited; annotations often create complexity and confusion.<\/td>More complex initially but clearer and explicit API structure simplifies large-scale use.<\/td><\/tr>
Controller Examples<\/strong><\/td>NGINX, AWS ALB, Traefik (Legacy), HAProxy, Contour (Legacy), Ambassador<\/td>Kubernetes Gateway API Controllers (AWS ALB Gateway Controller, Istio Gateway, GKE Gateway, Traefik, Contour, Ambassador)<\/td><\/tr>
Observability & Metrics<\/strong><\/td>Basic, typically external via Prometheus integrations.<\/td>Explicit support for advanced observability via standardized controllers and integrations (e.g., Envoy, Istio).<\/td><\/tr>
Security and Policy Management<\/strong><\/td>Limited; annotations or external tools required.<\/td>Explicitly designed to support policy attachments (authentication, authorization, rate limiting, WAF policies).<\/td><\/tr>
Portability (Cloud neutrality)<\/strong><\/td>Lower (annotations\/vendor-specific implementations).<\/td>Higher (standardized Kubernetes API ensures portability across clouds and providers).<\/td><\/tr>
Traffic Management (Canary\/Blue-Green)<\/strong><\/td>Limited via annotations and third-party tools (Argo Rollouts, Flagger).<\/td>Built explicitly with advanced traffic splitting and routing, facilitating canary deployments, blue-green rollouts, and weighted routing.<\/td><\/tr>
Community & Maturity<\/strong><\/td>Mature with extensive community & documentation.<\/td>Rapidly maturing, large community investment, emerging as Kubernetes standard.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
\n\n\n\n

\ud83d\udccc Pros and Cons Simplified<\/strong><\/h2>\n\n\n\n

\ud83d\udfe1 Ingress (Legacy):<\/strong><\/h3>\n\n\n\n

\u2705 Pros:<\/strong><\/p>\n\n\n\n

    \n
  • Simple & straightforward for basic use.<\/li>\n\n\n\n
  • Mature, widely supported by most controllers.<\/li>\n\n\n\n
  • Extensive online examples & documentation.<\/li>\n<\/ul>\n\n\n\n

    \u274c Cons:<\/strong><\/p>\n\n\n\n

      \n
    • HTTP\/HTTPS only, limited advanced features.<\/li>\n\n\n\n
    • Heavy reliance on vendor-specific annotations.<\/li>\n\n\n\n
    • Poor multi-tenancy support and scalability.<\/li>\n\n\n\n
    • Difficult to extend and manage complex routing rules.<\/li>\n<\/ul>\n\n\n\n

      \ud83d\udd35 Gateway API (Modern):<\/strong><\/h3>\n\n\n\n

      \u2705 Pros:<\/strong><\/p>\n\n\n\n

        \n
      • Explicit, clear, standardized, cloud-neutral.<\/li>\n\n\n\n
      • Multi-protocol (HTTP, HTTPS, TCP, UDP, etc.).<\/li>\n\n\n\n
      • Advanced routing & security built-in.<\/li>\n\n\n\n
      • Explicit multi-team and multi-tenant support.<\/li>\n\n\n\n
      • Highly extensible, supports advanced scenarios.<\/li>\n<\/ul>\n\n\n\n

        \u274c Cons:<\/strong><\/p>\n\n\n\n

          \n
        • Slightly higher initial complexity.<\/li>\n\n\n\n
        • Not yet fully mature (rapidly growing ecosystem).<\/li>\n<\/ul>\n\n\n\n
          \n\n\n\n

          \ud83d\udea9 Which Should You Choose (Quick Guidance)?<\/strong><\/h2>\n\n\n\n
          Scenario<\/th>Recommended<\/th><\/tr><\/thead>
          Simple routing, small projects<\/strong><\/td>Ingress Resource<\/td><\/tr>
          Complex routing, large projects, multi-team setups<\/strong><\/td>Gateway API<\/td><\/tr>
          Advanced features (canary, policy management)<\/strong><\/td>Gateway API<\/td><\/tr>
          Cloud\/vendor-neutral & portable deployments<\/strong><\/td>Gateway API<\/td><\/tr>
          Mature ecosystem required, easy to adopt<\/strong><\/td>Ingress (NGINX\/Traefik)<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
          \n\n\n\n

          \ud83d\udd0d Real-life Example (Both Approaches):<\/strong><\/h2>\n\n\n\n

          \ud83d\udfe1 Ingress (Legacy):<\/strong><\/h3>\n\n\n
          apiVersion: networking.k8s.io\/v1\nkind: Ingress\nmetadata:\n  name: legacy-ingress\nspec:\n  rules:\n  - host: app.example.com\n    http:\n      paths:\n      - path: \/\n        pathType: Prefix\n        backend:\n          service:\n            name: web-service\n            port:\n              number: 80\n<\/code><\/span><\/pre>\n\n\n
          \ud83d\udd35 Gateway API (Modern):<\/strong><\/h3>\n\n\n
          # GatewayClass<\/span>\napiVersion: gateway.networking.k8s.io\/v1\nkind: GatewayClass\nmetadata:\n  name: alb-gateway\nspec:\n  controller: gateway-api-controller.aws.amazon.com\/alb\n\n---\n# Gateway<\/span>\napiVersion: gateway.networking.k8s.io\/v1\nkind: Gateway\nmetadata:\n  name: prod-gateway\nspec:\n  gatewayClassName: alb-gateway\n  listeners:\n  - protocol: HTTPS\n    port: 443<\/span>\n    name: web-https\n    tls:\n      mode: Terminate\n      certificateRefs:\n      - name: example-cert\n\n---\n# HTTPRoute<\/span>\napiVersion: gateway.networking.k8s.io\/v1\nkind: HTTPRoute\nmetadata:\n  name: app-route\nspec:\n  parentRefs:\n  - name: prod-gateway\n  rules:\n  - matches:\n    - path:\n        type: PathPrefix\n        value: \"\/\"<\/span>\n    backendRefs:\n    - name: app-service\n      port: 80<\/span>\n<\/code><\/span>Code language:<\/span> PHP<\/span> (<\/span>php<\/span>)<\/span><\/small><\/pre>\n\n\n
          \n\n\n\n
          \ud83c\udfaf Summary (One-liner):<\/strong><\/h2>\n\n\n\n
            \n
          • Ingress (Legacy)<\/strong> is simpler but limited; ideal for quick or basic use-cases.<\/li>\n\n\n\n
          • Gateway API (Modern)<\/strong> is powerful, standardized, scalable, and future-proof\u2014best for modern enterprise-grade deployments.<\/li>\n<\/ul>\n\n\n\n
            \n\n\n\n
            <\/p>\n","protected":false},"excerpt":{"rendered":"
            Here’s a clear, detailed, and comprehensive comparison of Kubernetes Ingress (Legacy) vs. Kubernetes Gateway API (Modern), covering all key aspects clearly and practically: Feature \/ Parameter \ud83d\udfe1 Ingress (Legacy) \ud83d\udd35… <\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"_joinchat":[],"footnotes":""},"categories":[2],"tags":[],"class_list":["post-48839","post","type-post","status-publish","format-standard","hentry","category-uncategorised"],"_links":{"self":[{"href":"https:\/\/www.devopsschool.com\/blog\/wp-json\/wp\/v2\/posts\/48839","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.devopsschool.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.devopsschool.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.devopsschool.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.devopsschool.com\/blog\/wp-json\/wp\/v2\/comments?post=48839"}],"version-history":[{"count":2,"href":"https:\/\/www.devopsschool.com\/blog\/wp-json\/wp\/v2\/posts\/48839\/revisions"}],"predecessor-version":[{"id":48846,"href":"https:\/\/www.devopsschool.com\/blog\/wp-json\/wp\/v2\/posts\/48839\/revisions\/48846"}],"wp:attachment":[{"href":"https:\/\/www.devopsschool.com\/blog\/wp-json\/wp\/v2\/media?parent=48839"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.devopsschool.com\/blog\/wp-json\/wp\/v2\/categories?post=48839"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.devopsschool.com\/blog\/wp-json\/wp\/v2\/tags?post=48839"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}