Migrating Ingress-NGINX to Gateway API and eBPF Dataplanes

The official retirement of the community-maintained Ingress-NGINX controller marks a decisive inflection point for enterprise Kubernetes management. For years, Ingress-NGINX served as the default ingress controller across countless production clusters. However, its monolithic architecture and reliance on complex, unstructured string annotations have created an unsustainable operational burden. Coupled with the discovery of critical vulnerabilities like IngressNightmare (CVE-2025-1974)—an unauthenticated remote code execution (RCE) flaw—the imperative to modernize traffic routing infrastructure is no longer optional.

Engineering leaders, CTOs, and platform architects must recognize that patching legacy ingress controllers is a temporary defense against systemic architectural flaws. CVE-2025-1974 exposes how easily Lua injection and dynamic directive evaluation can compromise entire cluster control planes. Transitioning to the Kubernetes Gateway API and eBPF-powered dataplanes provides a structured, role-based access control (RBAC) native alternative that dramatically reduces attack surfaces while elevating network visibility and system performance.

Business & Operational Impact

Continuing to rely on retired software in production environments poses severe business and regulatory risks. Ingress-NGINX's annotation-heavy syntax forces security teams to audit unstructured text configurations across hundreds of microservices. This lack of clear boundaries between infrastructure operators and application developers creates configuration drift, shadow routing rules, and privilege escalation pathways. A single malicious or malformed annotation can lead to unauthenticated remote code execution, compromising customer data, operational uptime, and compliance certifications like SOC 2 and ISO 27001.

Beyond security, legacy ingress controllers impose significant performance overhead. Monolithic NGINX reloads disrupt active connection pools and scale poorly in dynamic environments with high pod churn. By shifting to Gateway API implementations backed by eBPF (Extended Berkeley Packet Filter) technology, organizations eliminate NGINX reload penalties, reduce CPU overhead, and achieve kernel-level packet routing. This structural upgrade lowers cloud infrastructure expenditures while improving service reliability and request latency.

Architectural & Engineering Blueprint

A successful migration requires replacing annotation-driven ingress manifests with the Gateway API's decoupled, resource-oriented architecture. The Gateway API introduces distinct custom resource definitions (CRDs)—GatewayClass, Gateway, and HTTPRoute—that enforce strict separation of concerns through RBAC.

Here is a declarative Gateway API manifest that separates infrastructure provisioning from application routing:

apiVersion: gateway.networking.k8s.io/v1
kind: Gateway
metadata:
  name: production-gateway
  namespace: infra-gateways
spec:
  gatewayClassName: cilium
  listeners:
  - name: https
    protocol: HTTPS
    port: 443
    tls:
      mode: Terminate
      certificateRefs:
      - name: production-tls-cert
    allowedRoutes:
      namespaces:
        from: Selector
        selector:
          matchLabels:
            env: production
---
apiVersion: gateway.networking.k8s.io/v1
kind: HTTPRoute
metadata:
  name: core-api-route
  namespace: payment-service
spec:
  parentRefs:
  - name: production-gateway
    namespace: infra-gateways
  hostnames:
  - "api.company.internal"
  rules:
  - matches:
    - path:
        type: PathPrefix
        value: /v1/payments
    backendRefs:
    - name: payment-service
      port: 8080

Integrating eBPF-powered dataplanes like Cilium completely bypasses user-space proxy overhead for network routing. Kernel-level eBPF programs handle packet manipulation and load balancing directly within the host network stack. This eliminates sidecar proxies, removes the risk of Lua string injection, and enables deep observability into TCP/UDP traffic streams without modifying application containers or ingress specs.

What This Changes in Practice

• Enforce Strict Role Separation: Infrastructure engineers manage Gateway resources and TLS termination, while application developers control isolated HTTPRoute manifests.
• Eliminate String Annotation Vulnerabilities: Replace brittle, unvalidated annotation directives with strongly typed CRD fields validated by OpenAPI schemas and admission webhooks.
• Deploy Kernel-Level Traffic Control: Adopt eBPF-based dataplanes to handle layer 4 and layer 7 traffic routing directly in the kernel, reducing proxy latency and CPU consumption.
• Automate Migration Audits: Implement CI/CD linting pipelines using tools like Open Policy Agent (OPA) or Kyverno to detect and block legacy Ingress resources across deployment repositories.
• Establish Continuous Vulnerability Management: Remove retired ingress components from clusters to eliminate exposure to unpatched zero-day exploits like CVE-2025-1974.

How Ali Run AIOps Approaches This

At Ali Run AIOps, we assist enterprise clients in modernizing complex Kubernetes infrastructure without downtime or operational disruption. Our SRE and platform engineering practices specialize in migrating legacy ingress architectures to robust, RBAC-native Gateway API implementations paired with enterprise eBPF solutions. We conduct comprehensive infrastructure audits, design secure multi-tenant ingress topologies, and implement automated GitOps pipelines to ensure seamless transition strategies.

By combining deep Linux administration capabilities with advanced Kubernetes engineering, Ali Run AIOps transforms vulnerable ingress configurations into high-performance, cyber-resilient networking foundations. We empower engineering organizations to mitigate zero-day security risks, streamline developer workflows, and lower operational costs across hybrid and multi-cloud environments.

Sources

• Ingress NGINX Retirement: What You Need to Know
• IngressNightmare: Unauth RCE in Ingress NGINX (CVE-2025-1974)
• Ingress-nginx CVE-2025-1974: What You Need to Know