Kubernetes: Ingress controllers

Ingress controllers provide an API object (kind: Ingress) that manages external access to the services in a cluster, typically HTTP/HTTPS. Ingress is frozen and new features are being added to the Gateway API.

Ingress can provide:

• Load balancing
• SSL termination (tls:)
• name-based virtual hosting (hosts:)

Links:

• https://kubernetes.io/docs/concepts/services-networking/ingress-controllers/
• https://kubernetes.io/docs/concepts/services-networking/ingress/

• kind: Ingress

Commands

• kubectl get ingress -A
• kubectl create ingress
• kubectl describe ingress
• minikube addons enable ingress
• kubectl get ingressclass

Available Ingress controllers

• Nginx: Ingress-nginx
• Traefik
• AWS Load Balancer Controller

Changes

• GA in Release 1.19 (Aug 2020)
• v1.18 (Mar 2020) New pathType resources: Exact, Prefix
• Ingresses can specify the class they are associated with by using a new ingressClassName field on Ingresses
• PathType: ImplementationSpecific(default), Exact, Prefix https://kubernetes.io/docs/concepts/services-networking/ingress/#path-types
• IngressClass resource

Helm

• helm install --set persistence.enabled=true grafana grafana/grafana --set ingress.enabled=true
• Prometheus values.yml https://github.com/prometheus-community/helm-charts/blob/main/charts/kube-prometheus-stack/values.yaml

Related terms

• Kong Ingress Controller: kubectl edit ingresses.extensions kong-proxy
• Envoy Proxy
• Egress
• Istio service mesh
• kubectl api-resources
• Kubernetes controllers
• CKA 1.23: Know how to use Ingress controllers and Ingress resources
• Kubernetes Gateway API
• minikube start: E1028 18:30:39.469884 3524 cache.go:203] Error downloading kic artifacts: not yet implemented, see issue #8426
• ingresses.networking.k8s.io
• IngressShim

Activities

• CKA v1.23: Know how to use Ingress controllers and Ingress resources
• CKA v1.18: Know how to use Ingress rules
• Read Improvements to the Ingress API in Kubernetes 1.18 https://kubernetes.io/blog/2020/04/02/improvements-to-the-ingress-api-in-kubernetes-1.18/
• Exposing an External IP Address to Access an Application in a Cluster
• Understand difference between Ingress vs Load Balancer
• CKA Understand ClusterIP, NodePort, LoadBalancer service types and endpoints
• kubectl describe ingress | grep Address

See also

• kubectl create ingress | kubectl get ingress, kubectl describe ingress, Kong, Kubernetes Gateway API, kubectl apply -f ingress.yaml, kubectl get ingressclass
• Ingress controllers, NGINX Ingress Controller, minikube addons enable ingress, kubectl get ingress, kubectl get ingressclass, kubectl describe ingress, Ingress:, Ingress API, AWS Load Balancer Controller, Envoy Proxy, GKE Ingress, Kubernetes Gateway API, ingress.k8s.aws, ingresses.networking.k8s.io, kind: Ingress: ( tls:, hosts: ), SuccessfullyReconciled
• Kubernetes controllers: Ingress, controller., AWS Load Balancer controller, kubectl describe ingressclass nginx
• Kubernetes networking: network policies, Network Policy Providers, CNI, Calico, flannel, Service mesh, Istio, kube-proxy, coredns, AWS VPC CNI: vpc-cni, Kubernetes: Ingress controllers, IPVS, ServiceTypes: LoadBalancer, ClusterIP, NodePort, ExternalName, Endpoints, EndpointSlices, Kubernetes DNS, svc.cluster.local, Weave Net